193results about How to "Solve preparation difficulties" patented technology

The invention discloses a large-capacity high-power polymer lithium iron phosphate power battery. The weight ratio of anode slurry is as follows: 81 to 85 percent of lithium iron phosphate, 1 to 5.5 percent of superconduction carbon, 0 to 2.5 percent of conductive carbon soot, 0 to 4 percent of conductive black lead, 0 to 2.5 percent of crystalline flake graphite, 0 to 2 percent of carbon nanometer tube as well as 6 to 7.5 percent of polyvinylidene fluoride; the weight ratio of cathode slurry is as follows: 89 to 91 percent of cathode material, 1 to 3.5 percent of superconduction carbon, 0 to 2 percent of conductive carbon soot, 0 to 4 percent of conductive black lead, 2.5 to 3.5 percent of styrene-butadiene rubber as well as 1.5 to 2 percent of sodium carboxymethyl cellulose; the steps for preparing the battery are as follows: preparing slurry, coating the anode and the cathode, rolling and pressing a polar plate, transversely and separately cutting the polar plate, baking the polar plate, welding the polar ears of the anode and the cathode, preparing a battery cell, putting the electric core into a shell and sealing, baking the electric core, injecting liquid into the battery as well as forming the battery and dividing the volume of the battery. The invention relates to a lithium-ion secondary battery which can provide drive energies for electric tools, electric bicycles, motor cars and electric vehicles.

The invention relates to an all-solid state electrochromic device preparation method and prepared electrochromic glass, and solves the technical problems of complicated process, low yield and the like in existing electrochromic device preparation. A bottom transparent conducting layer, a lower pole electrochromic layer, an upper pole electrochromic layer and a top transparent conducting layer are sequentially deposited and grown on a transparent substrate, the upper pole electrochromic layer is directly deposited and grown on the lower pole electrochromic layer, an ion source is deposited on the upper pole electrochromic layer, the top transparent conducting layer is deposited and grown after the ion source is deposited, and finally, the device is prepared by heat treatment or optical treatment. Compared with traditional preparation technology, growth of an ion conduction layer is omitted, the technological process is simplified, yield is improved, and cost is reduced.

The invention provides a novel haemophilus parasuis disease trivalent inactivated vaccine and a preparation method thereof. The vaccine comprises equal proportions of antigens of: inactivated haemophilus parasuis serotype 4 JS strain, inactivated haemophilus parasuis serotype 5 ZJ strain, and inactivated haemophilus parasuis serotype 12 HeB strain. According to the invention, the haemophilus parasuis serotype 4, serotype 5, and serotype 12 strains are obtained by separation. Concentration contents and relative proportions of the antigens prepared from the three strains are subjected to large amounts of woks and practices, such that the trivalent vaccine with an appropriate antigen ratio and an appropriate concentration is obtained. The trivalent vaccine has good preventing and treating effects against haemophilus parasuis diseases caused by various epidemic haemophilus parasuis serotypes in our nation. Especially, the trivalent vaccine can solve a problem of poor treatment effect of existing vaccines caused by novel haemophilus parasuis pathogens.

The invention relates to a simple solvothermal growth method for preparing an oriented growing metal organic skeleton nanometer slice film. The method comprises the following steps: introducing a positioning active point for the oriented growth of the metal organic skeleton nanometer slice film on the surface of a carrier, namely, growing a layer of nanoscale zinc oxide as the positioning active point for metal central ion coordinate on the carrier surface through hydro-thermal synthesis, thereby acquiring a carrier with ZnO nanometer layer positioning active point; putting the carrier into a synthesis solution of the metal organic skeleton nanometer slice film and compounding through a solvothermal system; and controlling growth, thereby forming the continuous and uniform horizontal or vertical oriented metal organic skeleton nanometer slice film. The preparation method solves the problem of difficulty and complexity of preparation of a metal organic skeleton nanometer slice film and has the advantages of simpleness, convenience, capability of forming film on large-area carriers and excellent amplifying and application prospect.

The invention provides a method of preparing a high-orientation two-dimensional metal-organic frameworks nanosheet-type film through induced growth of zinc oxide in a limited range of graphene oxide. According to the method, a locating active site of the MOFs (metal-organic frameworks) nanosheet-type film is introduced onto the surface of a carrier, in other words, a layer of nanoscale ZnO is grown on the surface of the carrier according to a sol-gel method to serve as the locating active site, and accordingly, the carrier with a ZnO nanolayer is obtained; a thin graphene oxide film is introduced onto the surface of the carrier through pulling to play a role in range limiting and inducing for growth of the nanosheet-type film; the carrier is put in MOFs nanosheet film compounding liquid for solvent thermal system compounding, the continuously-uniform high-orientation MOFs nanosheet-type film is formed through precisely regulated growth, and excellent gas separation effect and high stability and repeatability of the film are displayed. The method has the advantages that the problem that existing metal-organic frameworks nanosheet-type films are difficult and complex to prepare is solved, simplicity, convenience and film formation on large-area carriers are achieved, and the method has good amplification and application prospect.

A process for preparing the organic electroluminescent display screen covered by protecting membranes is characterized by that the carrier substrate of the display screen is sequentially covered witha film able to absorb water and oxygen, an inorganic protecting film for preventing and stopping air, and a high-molecular film able to prevent penetration of external water and oxygen. Its advantages are thin thickness, low cost and high productivity.

The invention discloses a crater-type graphical sapphire substrate and a preparation method thereof. An ordinary commercial micrometer PSS substrate is used as an imprint template, rather than a customized imprint template is used, patterns are simple, the expense is low, and the problem that the imprint template is difficult to prepare and the cost is high can be ingeniously solved; meanwhile, an annular mask is prepared by utilizing a nanoimprint technology, a high-quality VPSS can be acquired by combining a sapphire etching technology, and the commercialization of the VPSS can be facilitated; by adopting the secondary imprint method and the IPS technology, the patterns on the imprint template are prevented from being directly transferred onto a nano imprint adhesive which is coated on an epitaxial slice in a spinning mode, and the breaking of the template can be avoided; STU is collectively imprinted by adopting hot pressing and ultraviolet imprinting, so that the output efficiency and repeatability can be improved. Compared with the ordinary micrometer PSS, the crater-type graphical sapphire substrate has more lateral epitaxial components and larger reflection area, so that the improvement of the light emitting efficiency of the LED can be better facilitated.

The invention discloses a preparation method of 2,4,6-trimethylbenzoyldiphenyl phosphine oxide. According to the preparation method, triphenyl phosphine is taken as the raw material, triphenyl phosphine reacts with metal sodium and phosphorus halide to generate reaction product (I), the reaction product (I) reacts with acyl chloride to generate reaction product (II), and the reaction product (II) is oxidized to produce 2,4,6-trimethylbenzoyldiphenyl phosphine oxide. The preparation method has the advantages of easily-available raw materials, low cost, easy operation, environment-friendliness, and easiness for industrialization.

The invention relates to a vertical polarization directional-printing filtering antenna, which comprises a three-layer structure, wherein the middle layer is a medium layer; the front side of the medium layer is an upper-surface metal layer (1); all the back of the medium layer is a metal layer which is called a lower-surface metal layer; one end of the upper-surface metal layer (1) is connected with a microstrip line (4); the microstrip line (4) is connected with a SIW (Substrate Integrated Waveguide) transmission line by a microstrip transition line (5); the SIW transmission line is provided with an SIW inductive window filter coupling window (8) formed by a metallized through hole (7) and with an SIW inductive window filter resonant cavity (9); the SIW transmission line is connected with a crossfeed microstrip patch array by a graded-index microstrip line (6); and the crossfeed microstrip patch array is formed by the feeding of a metal patch (2) by a metal connecting line (3). The antenna is easy to manufacture, has high machining precision and is especially suitable for high frequency, such as a Ku waveband.

The invention discloses a method for manufacturing a copper-tungsten contact. The method comprises the following steps of: manufacturing a tungsten blank; manufacturing a graphite crucible; drying the graphite crucible; protecting the graphite crucible; preparing cupriferous materials; mounting the crucible; charging, vacuumizing, heating and infiltrating; and cooling and discharging, and the like. The specially-made graphite crucible is used for containing materials in a vacuum environment; copper or chromiumbronze solution is sufficiently infiltrated in the tungsten blank by using a vacuum negative-pressure infiltration method to manufacture the contact; the melting point of copper is reduced in the vacuum environment; the cupriferous materials are easy to infiltrate into the tungsten blank and are fused with the tungsten blank sufficiently and uniformly; the total usability and the yield of the copper-tungsten contact are increased; and manufacture difficulty that the diameter of the copper-tungsten contact is too large and the copper-tungsten contact is too long is overcome.

The invention provides a low-cost and high-efficiency Al-Ti-C-Ce refining agent comprising the following components in percentage by mass: 4.0-16.0% of Ti, 0.5-3.0% of C, 0.5-2.0% of Ce and the balance of Al; and a material phase composition of the refining agent comprises alpha-Al, TiAl3, TiC and Ti2Al20Ce. The Al-Ti-C-Ce refining agent provided by the invention is prepared by adopting an aluminum melt thermal explosion method, and the aluminum melt thermal explosion method mainly comprises the following process steps: (1) preparing raw materials: weighing aluminum powder, titanium powder, graphite powder, aluminum ingots and cerium ingots according to component requirements; (2) uniformly mixing the aluminum powder, the titanium powder and the graphite powder, and pressing to form blocks; (3) heating and melting the aluminum ingots, and then synchronously pressing the cerium ingots and the blocks prepared in the step (2) into aluminum melts by using a graphite clock cover to perform reaction; and (4) filtering the melts, removing molten slag, and casting to obtain Al-Ti-C-Ce refining agent products.

The invention provides a manufacturing method of a grinding-free drill bit, which comprises a drill body and a detachable cutting blade connected on the front end of the drill body; the manufacturing method is characterized by comprising the following steps: (1) according to the set depth and width, the front end of the drill body is equipped with a spiral groove for holding the cutting blade; both inner side walls of the spiral groove are arcwall faces, and the two arcwall faces are of central symmetry, so that the entire outline of the spiral groove is of S shape; each arcwall surface is a parallelogram after being unfolded; (2) the cutting blade with side walls being two symmetrical arcwall faces and matched with the inner wall shape of the spiral groove is prepared; (3) the cutting blade is placed into the drill spiral groove, and connected to prepare the grinding-free drill bit. No sequence exists between step (1) and step (2). The manufacturing method also provides the grinding-free drill bit prepared by using the method.

The invention discloses a multi-camera measurement method based on a refractive projection model and a beam tracking method, and used for the field of visual detection and image measurement. The process of the present invention comprises the following steps of: building a multi-camera system; global calibrating by multi-camera based on the refractive projection model and the beam tracking method;respectively capturing images from different directions by a plurality of cameras; extracting and matching features to obtain measured three-dimensional points; converting the three-dimensional pointsobtained by each subsystem into the same coordinate system to obtain global measured data; and using the obtained three-dimensional point data to calculate an indirect amount (e.g., strain, displacement). The key of the present invention is the calibration of the multi-camera system, the result will affect the subsequent three-dimensional point acquisition. According to the multi-camera measurement method based on the refractive projection model and the beam tracking method, the features in the measurement process are that the multiple cameras in the system can be calibrated at the same timeto solve the problem that a planar calibration plate limits the distribution of multiple cameras, and the measurement process is flexible.

The invention relates to the field of spaceflight, in particular to a gradient lattice structure for additive manufacturing and a design method thereof. The embodiment of the gradient lattice structure comprises multiple stages of layered lattices sequentially connected in the preset direction, and each stage of the layered lattices comprise at least one lattice cell unit; and each lattice cell unit comprises multiple rod parts, the multiple basic rod parts intersect at one point, and the lattice cell unit has the triple or quadruple or sextuple spatial rotation symmetry in the preset direction of the intersection points. In the preset direction, the gradient of the configuration of each lattice cell unit in each stage of the layered lattices is increased relative to the configuration of each lattice cell unit in the last stage of the layered lattices. The gradient of the configuration of each lattice cell unit in each stage of the layered lattices is increased relative to the configuration of each lattice cell unit in the last stage of the layered lattices, therefore, the strength and the rigidity of the layered lattices are improved step by step, and performance gradient changesof the whole gradient lattice structure are achieved.

The invention provides a halbach birotor self-sliding wide range speed regulation permanent magnet hub motor for an electric vehicle. The halbach birotor self-sliding wide range speed regulation permanent magnetism hub motor for an electric vehicle includes barrel-shaped inner and outer rotors, a rotatable stator with inner and outer double layer armature windings, two end caps with special structures, an automatic sliding structure fully utilizing mutual coordination of permanent magnet attractive force and a freewheel clutch, and a double reinforcing structure utilizing an electromagnetic clutch. Besides, the hub motor also utilizes a design of a wireless transmission position sensor signal, a sectional type speed regulation design, Halbach array permanent magnet setting, and a novel heat radiation design, and then becomes a unique motor after being integrated with the other patent: self-sliding motor intelligent cruise and PWM and SVPWM control conversion.

The invention relates to a lithium ion ternary positive electrode material with high nickel content and low free lithium content, and a preparation method and application thereof. The chemical formulaof the positive electrode material is LiNixCoyMn (1-x-y) MaO2, and the element Mn and the element Al can be replaced with each other, and the replacement ratio is 0-100 percent, wherein: x=0. 6-0.9,y=0. 01-0.2, x + y < 1; M is a doped element selected from Al, Mg and / or Zr, 0<=a<=0.08; the positive electrode material comprises primary particles and secondary particles formed by agglomeration ofthe primary particles, the mass percent of the primary particles is 80.0-99.5 percent, and the average aspect ratio of the positive electrode material is 1.5-3.0, the positive electrode material contains less than 0.16 weight percent of free lithium ions. The positive electrode material of the invention has high Ni content, low free lithium content, high primary particle content and good safety performance, and can be applied to a high voltage and long cycle system. The method for preparing the positive electrode material of the present invention eliminates the traditional precursor precipitation preparation process, and is more favorable for stable homogeneous dispersion and in-situ synthesis of doped elements. The method is economical and feasible, has wide applicability, and has good application prospect.

The invention belongs to the field of research on photoelectron devices, in particular to a CuPc / ZnO organic / inorganic compound solar battery. The solar battery consists of an ITO substrate, a ZnO nanometer line array, a CuPc film, a CuPc / ZnO multilayer film and a gold electrode. The ITO substrate, the ZnO nanometer line array, the CuPc film, the CuPc / ZnO multilayer film and the gold electrode are sequentially arranged from a bottom layer to a top layer, wherein the ZnO nanometer line array can be repeated, has uniform density and size and is directionally grown vertical to the substrate. Since the respective advantages of CuPc in optical absorption and ZnO in electronic conduction are combined and the multi-interface property is also utilized, the opto-electrical conversion efficiency is improved.

The present invention discloses a filling concrete, which comprises a concrete mixture, a concrete admixture and a cementing material, wherein the concrete mixture is inert powder, the concrete admixture comprises one or a plurality of materials selected from an anti-dispersing agent, a tackifier and a high-performance polycarboxylate water-reducing agent, the use amount of the cementing material is 270-400 kg / m<3>, the sand rate is 45-52%, and the water-cement ratio is 0.56-0.85. According to the present invention, the concrete has good flowing performance, can achieve the self-leveling effect under water, has good underwater non-dispersibility, and can effectively resist seawater erosion, wherein the zero bleeding rate of the concrete can ensure the immersed tube foundation post-filling fullness in a seawater environment.

The invention discloses a method for measuring the magnitude of a white light interferometer with an etalon. The method comprises the steps: a parallel light path system with the same clear aperture is additionally arranged in front of a light splitting light path in a light path of the white light interferometer, and the etalon is placed in the parallel light path system; interference fringes ofthe interferometer are adjusted, and two coherent light paths of the interferometer are adjusted to be completely vertical; the distances between two coherent lights from the light splitting point tothe two reference mirrors are adjusted to be equivalent, and a white light zero-order interference band appears; through the adjustment of the reference mirrors and a gauge block workbench, the interference band on steel flat crystal is parallel to the short edge of a measured block, and the zero-order interference band on the measured block passes through the midpoint of the middle part of the measured block; and the distance between the zero-order interference band on the steel flat crystal and the zero-order interference band on the central point of the measured block is measured and corrected. According to the method, the measurement precision of the gauge block is improved, gross errors are avoided, the measurement efficiency is improved, abrasion is avoided, the service life is long,measurement automation and semi-automation are easy to achieve, and many kinds of precision measurement can be conducted.

The invention provides a touch inductor for a capacitive touch screen with a film structure and a manufacturing method thereof. The manufacturing method comprises the following steps: selecting a film which has a first preset size and comprises a conductive layer and a solid-state light resistance dry film with a second preset size; adhering the solid-state light resistance dry film to the surface of the conductive layer; exposing the solid-state light resistance dry film and the conductive layer by employing a mask plate; developing the exposed solid-state light resistance dry film and the conductive layer; performing pattern etching on the developed solid-state light resistance dry film and the conductive layer; stripping the residual solid-state light resistance dry film subjected to pattern etching; and manufacturing functional routing. According to the manufacturing method, the problem that the method for coating liquid-state light resistance glue is difficult to manufacture is solved, the product performance of a touch screen is improved, the production cost is reduced, and the touch inductor has the advantage of extremely high cost performance.

The invention discloses a slow wave structure based on a semiconductor-filled metal waveguide structure. The slow wave structure comprises a uniform metal hollow waveguide pipe wall, an air gap and a conical filled high-refractive index semiconductor medium strip. In the slow wave structure, by utilizing the abnormal characteristic that the direction of energy flow in the air gap is opposite to that of energy flow in media when electromagnetic waves are transmitted in a high-refractive index semiconductor-filled waveguide structure and selecting parameters of the waveguide structure reasonably, the average energy flow of the electromagnetic waves with different frequencies in air and the average energy flow of the electromagnetic waves with different frequencies in a semiconductor at the corresponding position of waveguide are approximate, so the electromagnetic waves have extremely low group velocity. When the electromagnetic waves enter a port and are transmitted along the waveguide, the group velocity of the electromagnetic waves is reduced gradually, and the energy of the electromagnetic waves is enhanced gradually until the electromagnetic waves reach specific parts corresponding to the frequencies; and waveguide parts in which the electromagnetic waves with the different frequencies can reach are different from one another, so the frequency division, field restriction and reinforcing effects of the electromagnetic waves are realized simultaneously by the structure.

The invention provides an optical voltage transformer based on an SF6 coaxial capacitance voltage divider. The optical voltage transformer comprises a high voltage shell, an insulation casing and a base. The high voltage shell and the insulation casing are connected to a whole body. Both the high voltage shell and the insulation casing are filled with SF6 gas. The base is fixedly connected to the insulation casing, and the base and the insulation casing are separated by a baffle plate. The base is provided with a grounding terminal. The invention relates to the optical voltage transformer based on the SF6 coaxial capacitance voltage divider. By using the SF6 coaxial capacitor formed by a primary conduction rod and an annular metal electrode as a high voltage side voltage divider capacitor, the problem of difficult manufacture of a current optical voltage transformer high voltage capacitor. The transformer has the advantages of small size, light weight and high accuracy, and the overall error is less than 0.1%.

The invention provides an effective method for doping nitrogen into carbon nanotips, which comprises the following steps: depositing a gold film on an Si substrate as a catalyst layer; and by using CH4, H2 and N2 as reactant gases, effectively doping nitrogen into the carbon nanotips in the process of preparing the carbon nanotips by chemical vapor deposition by reinforcing a hot wire with plasma, wherein the gold film is 5-30nm thick; in the reactant gases, the concentration of the CH4 is 15-20%, the concentration of the H2 is 50-65%, and the concentration of the N2 is 15-40%; the temperature of the substrate is 800-900 DEG C; the working pressure of the reaction chamber is 1500-3000Pa; the bias current is 120-160mA; and the growth time is 20-30 minutes. The carbon nanotips prepared by using the gold catalyst layer are amorphous carbon nanotips with the nitrogen content of higher than 11%, and have the components sp3C-N and sp2C-N. Particularly, the invention detects that the gold catalyst particles are positioned on the top ends of the carbon nanotips, thereby overcoming the difficulty in preparing electrodes at the top ends of the carbon nanotips, and laying foundation for application of light-emitting diodes (LEDs). The carbon nanotips can be used as a candidate material for preparation and photocatalysis of white LEDS and field electron emitters.

The invention provides a preparation method of a star-shaped polycarboxylate water reducer and belongs to the technical field of polycarboxylate water reducers for concrete. According to the star-shaped polycarboxylate water reducer, double-bond monomers, a multi-perssad nucleating agent, an initiating agent and end double-bond polyoxylethylene ether are used as raw materials and subjected to a polymeric reaction to obtain the star-shaped polycarboxylate water reducer. According to the technical scheme provided by the invention, pentaerythritol tris(3-mercaptopropionic acid)ester, triethanolamine tris(3-mercaptopropionic acid)ester, glucose tetra(3-mercaptopropionic acid)ester and ethylene diamine(3-mercaptopropionic acid)ester serve as the nucleating agent, and the star-shaped polycarboxylate water reducer is prepared and obtained. The yield of a star-shaped structure can be increased. Meanwhile, the preparation method is simple in process and suitable for industrial production.

The invention discloses an electroplating method based simple super-hydrophobic tube inner surface preparation device. The electroplating method based simple super-hydrophobic tube inner surface preparation device comprises a tube fitting and an electroplating anode which are coaxially arranged between a base and a top plate, wherein a lead screw passes through the top plate and the base for enclosing the electroplating anode and the tube fitting into a sealed reaction cavity; a conductive copper sheet is mounted on the upper surface, at the top end of the tube fitting, of the electroplating anode; the upper side surface of the conductive copper sheet is connected to a guide wire; the guide wire is accessed into a power supply through a top plate through hole; the top plate and the tube fitting are provided with openings, and are accessed into a circulating pipeline; a peristaltic pump drives a solution in a plating solution slot to enter the tube fitting to react, and then flow back into the plating solution slot to accomplish a cycle; and an ultrasonic transducer is mounted at the lower end of the base, and is coaxial with the tube fitting. The electroplating method based simplesuper-hydrophobic tube inner surface preparation device solves the problem that in-tube super-hydrophobic surface preparation is difficult, has the advantages of being high in cost performance, conveniently and quickly replacing the tube fitting, being strong in sealing property, adopting ultrasonic cavitation effect to reduce retention of gas bubbles in an electroplating process, and acceleratessurface reaction, so that uniformity of a hydrophobic surface structure is improved, and the purpose of controlling surface topography can be achieved by programing specified current output.

The invention discloses a method of processing a sample and determining element content, and belongs to the field of metallurgical chemical analysis. The method for processing a sample comprises steps: providing an inert container; transferring a uniform mixture of the sample and anhydrous lithium tetraborate into the container; laying anhydrous lithium tetraborate on the surface of the mixture; injecting a lithium bromide solution into the container; after the container is closed, placing the container in a heating environment, and subjecting substances in the container to a melting reaction.Various defects of an existing X-ray fluorescence detection method can be effectively overcome by treating the sample in the mode, a detection method suitable for both quick lime and high-magnesium metallurgical quick lime is established, and acceleration of the detection speed becomes a problem urgently needed to be solved in the technical field of lime detection.

The invention relates to an aluminum alloy casting method of a composite casting mold. A complex pouring system or part of casting structures adopt sand molds, so that the design limitation of the pouring system in investment casting is prevented, and the defects of weak roughness of casting surfaces of aluminum alloy sand molds and low size precision are solved; meanwhile, the pouring system partially adopts the sand mold casting to make up for the design limitation of the pouring system in investment casting; the total casting cost of investment casting is greatly saved; and the method is suitable for aluminum alloy castings with complex and compact structures, high precision, small wall thickness, high performance, ducts, complex cavities, complex oil ways and the like.

The invention discloses a fabrication method of a gold-plated finger board. According to the main points of the technical scheme, the fabrication method comprises the following steps: carrying out front process treatment on a board of a circuit board; painting a green ink; pasting blue glue; plating gold fingers; carrying out laser cutting; pasting the blue glue; etching secondary leads; carrying out screen printing of characters; and the like. According to a novel fabrication method, the secondary leads in the gold plating process are put on the leads at the bottom ends of the gold fingers; the connected secondary leads are developed and exposed during exposure in a solder mask process; after the gold fingers are plated; the connected leads are eliminated through an inner layer etching liquid; and the area is covered with a character oil clot in the character process, so that the problem that the gold finger board is scratched and scraped due to lead protrusion after the gold finger board is molded and bevel edges are routed and the problem of a fabrication difficulty due to the fact that copper is exposed out of the gold surfaces of the top ends of the gold fingers after the gold finger board is molded are effectively solved.

The invention discloses a method for 3D printing of a similar-goaf simulated building. The method comprises the steps of calculating mechanical strength similarity ratio of the simulated building to aprototype by similarity criteria; selecting 3D model materials with similar mechanical strength; adjusting parameters influencing the mechanical strength of the materials, and selecting according tothe mechanical strength requirement of the simulated building; performing model construction by applying 3D software; and enabling a 3D printer to print a simulated building model. Mechanical similarity and geometric similarity matching of the building are controlled through 3D printing materials, the filling rate, the printing angle and the like, the deformation observation problem of the buriedstructure is solved, and structural simulation of the multi-storey building is achieved.

This invention relates to a preparation method for aqueous concentrated suspension of silicon nitride. Firstly, silicon nitride powder is compounded into a slurry, its pH value is regulated with tetramethyl ammonium hydroxide, then the slurry is ground in ball mill, the above-mentioned powder is washed several times with deionized water as medium to remove solubable matter and high-valency counterion, it is thermo-insulated in air atmosphere, and finally the modified silicon nitride powder is added to high-purity deionized water, the suspension is regulated for pH value with tetramethyl ammonium hydroxide and is further ground in ball mill so to prepare the aqueous concentrated suspension of silicon nitride with low viscosity and high solid-phase content. By use of silicon nitride powder from different sources with similar good dispersivity, the aqueous concentrated suspension with solid-phase content higher than 50 vol.% can be prepared.