676results about How to "The preparation process is stable" patented technology

The invention relates to a steel forging manufacturing process for deep-sea Christmas tree equipment connectors, which comprises the following steps: (1) using chromium-nickel-molybdenum low-alloy steel as the blank material; (2) selecting square ingots, heating to 1220 DEG C, cogging, pulling out the material, sawing, and taking the middle section as the blank; (3) heating to the initial forging temperature, upsetting in the directions of three-dimensional coordinates, and drawing out to obtain the isotropic blank; (4) upsetting and forging the blank to obtain an octagonal prism, punching, circularly rolling and shaping to obtain a cylindrical forging stock with a hole; (5) carrying out rough machining on the cylindrical forging stock with a hole to obtain a cylindrical workpiece with a hole; (6) heating the cylindrical workpiece with a hole to 940 DEG C, and cooling in the air to room temperature; (7) heating the cylindrical workpiece with a hole subjected to the step (6), to 930 DEG C, and quenching with water; and (8) heating the cylindrical workpiece with a hole subjected to the step (7), to 640 DEG C, and cooling in the air to room temperature.

The invention discloses a self-crosslinking antibacterial hydrogel material containing hydroxypropyl chitosan / oxidized sodium alginate. The material is made from the following components by mass percent: 1-25% of hydroxypropyl chitosan, 1-30% of oxidized sodium alginate, 0.01-0.5% of nano-silver and distilled water. The material is prepared by the following steps: preparing the hydroxypropyl chitosan by a hydroxypropylation reaction of chitosan at the temperature of 10-90 DEG C; preparing the oxidized sodium alginate by an oxidation reaction of sodium alginate at the temperature of 10-45 DEG C; respectively preparing aqueous solution of the hydroxypropyl chitosan and aqueous solution of the oxidized sodium alginate; adding the nano-silver solution and blending at certain ratio; allowing self-crosslinking of the components at the temperature of 10-50 DEG C to produce the antibacterial hydrogel material. The antibacterial hydrogel material has the advantages of low cost, environmental protection, simple process and the like; as the hydroxypropyl chitosan has good biocompatibility, the oxidized sodium alginate is nontoxic to human body, and the nano-silver has excellent antibacterial property, the obtained material can be applied to wound dressing, hemostatic materials and the like.

The invention belongs to the field of a lead-free piezoelectric material and discloses BCT-BZT-BST (barium calcium titanate-barium zirconate titanate-barium stannate titanate) ternary system lead-free piezoelectric ceramic. The BCT-BZT-BST ternary system lead-free piezoelectric ceramic is characterized by having the following material components: Ba0.8-xCaxTi0.8O3-0.1BaTi0.9Sn0.1O3-0.1BaTi0.8Zr0.2O3, wherein x is in the range of 0.005 to 0.06. The BCT-BZT-BST ternary system lead-free piezoelectric ceramic is prepared from industrial raw materials by adopting a conventional piezoelectric ceramic preparation technology. The system is a perovskite phase. When x is in the range of 0.005 to 0.04, the BCT-BZT-BST ternary system lead-free piezoelectric ceramic is in morphotropic phase boundary region, has excellent piezoelectric property, has a piezoelectric constant d33 value of 420pC / N and an electro-mechanical coupling coefficient of 44 percent, and has a stable preparation process and wide application prospect.

The invention relates to a completely degradable polymer medicine elution stent and a preparation method thereof. The stent is prepared from the following steps: 1) processing and forming a degradable polymer material into a pipe; 2) subjecting the pipe to laser engraving to form a stent substrate; 3) polishing the surface of the degradable polymer stent substrate and removing processing defects on the surface of the stent; and 4) forming a medicine carrier coating on the surface of the degradable polymer stent substrate. In the invention, a novel light source is used for implementing the laser engraving of the pipe and the processing defects on the surface of the stent is polished by using a polishing technique, so the obtained stent has high structural stability and can has high mechanical supporting performance; and compared with the conventional method, the method has obvious advantages, the prepared stent has high biocompatibility, can effectively treat diseases such as intravascular stenosis and thrombus, has high positive remodeling effect on blood vessels and can effectively prevent a restenosis in later implanting period of the stent.

The invention belongs to the technical field of electronic element encapsulating materials, and specifically relates to a tackifier for addition type liquid silicone rubber and a preparation method thereof as well as adhesion addition type liquid silicone rubber containing the tackifier and a preparation method thereof. In a general structural formula of the tackifier, which is shown in the specification, m+n is equal to 15 to 20. The adhesion addition type liquid silicone rubber containing the tackifier has the advantages of good flowing property, high curing speed at room temperature, excellent heat-conducting property after curing and good adhesion property to aluminum products, glass, stainless steel, PA, PVC and ABS materials.

Disclosed is a method to prepare porous materials, which can not only be used for a catalyst, an adsorbent, a catalytic support, in ion exchange and gas storage, and the like, but can also be used to reserve or separate guest molecules with spaces (nanometer spaces) of nanometer size, and mixed metal oxides used as functional ceramics. More particularly, there is disclosed a preparation method, in which microwave energy is used as a heat source and a continuous stirred type reactor is used, the temperature is controlled by directly measuring the temperature of the slurry composed of the reactants, solvent and the product, and the pressure is controlled by measuring the pressure of the gas to thereby improve the stability of operation and the reproducibility, and it is easy to control the residence time and increase of the productivity, and the like can be accomplished. Further, according to the present invention, an apparatus to continuously prepare porous materials and mixed metal oxides for performing the preparing method is provided.

The invention relates to a preparation method of a hydroxylapatite coating on the surface of a titanium alloy matrix. The preparation method comprises the following steps: firstly respectively performing gas atomization pelleting treatments on titanium powder and hydroxylapatite powder, then uniformly mixing the titanium powder with hydroxylapatite powder, on which the gas atomization pelleting treatments are performed, so as to obtain mixed powder of which the particle size is 10-30 [mu]m, and the content of the hydroxylapatite powder in the mixed powder is 60%-80%; secondly, performing abrasive blasting roughening treatments on the surface of the titanium alloy matrix of which the surface is pretreated, and spraying the mixed powder to the surface of the titanium alloy matrix by a cold spraying method; and finally performing laser cladding treatments on the coating obtained by the cold spraying method so as to obtain the required hydroxylapatite coating. The preparation method disclosed by the invention utilizes the cold spraying method and the laser cladding composite technology to prepare the hydroxylapatite coating on the surface of the titanium alloy matrix, the preparation technology is simple and stable, the bonding strength of the prepared hydroxylapatite coating and the surface of the matrix can reach 40-50MPa, the coating is good in performance, and the long-term stability of between an implant and a bone interface of a host can be effectively facilitated.

The invention discloses a method for manufacturing a gecko-foot-seta-inspired biomimetic array. The method can comprise the following steps: selecting a material of which an upper layer is (100) type silicon and a lower layer is provided with a self-etching stopping layer to serve as a substrate; depositing an etching resistant layer on the surface of the upper silicon layer and patterning the etching resistant layer to form an etching resistant mask; corroding an exposed silicon structure through a silicon anisotropic etching method to form a strip with a trapezoidal cross section; removing the remaining etching resistant mask to expose the silicon structure; coating the silicon structure with a photoresist through a photoresist spraying process or a thick photoresist spin-coating method, and performing photoetching; depositing a seta structure with metal or other materials, and peeling the residual photoresist; and lastly, releasing sacrificial layer silicon through silicon isotropic etching to form the gecko-foot-seta-inspired biomimetic structural array. The method is simple in process, high in yield and suitable for large-scale manufacturing. The manufactured gecko-foot-seta-inspired biomimetic array has the advantages of long service life, high structural strength and the like, and has a wide application prospect in the fields of gecko foot form bionics, and the like.

A silicon capacitor vacuum sensor based on micro electro mechanical system (MEMS) technology relates to the field of micro electro mechanical system (MEMS) sensor and vacuum sensor manufacture. The silicon capacitor vacuum sensor comprises an upper polar plate, a lower polar plate, a middle insulating layer, a vacuum cavity and electrical lead bonding pads on the upper polar plate and the lower polar plate. The vacuum cavity is a sealed cavity formed by the upper polar plate and the middle insulating layer, or the upper polar plate, the middle insulating layer and the lower polar plate. The vacuum cavity is internally provided with an insulation support column array. A gap is left between each top surface of each insulation support column and the upper polar plate. The silicon capacitor vacuum sensor can effectively measure high vacuum degree; the vacuum degree coverage range is large; manufacture process is simple; and the problems of sensitive film breaking, adherence failure and the used glass material outgassing and the like in a miniature capacitor film sensor in the prior art are effectively solved.