63results about How to "Less micro defects" patented technology

The invention relates to a preparation method of a far infrared thermal-shock-resistant ceramic, and belongs to the field of preparation of ceramic materials. In order to solve the problems that when inorganic materials of metallic oxides and silicates are added to prepare a high-heat-resistance ceramic, the expansion coefficient of the material is reduced, and the thermal-shock-resistant ceramic is low in toughness, is easy to break up and cannot meet utilization requirements of the existing life on ceramics, the preparation method provided by the invention comprises: carrying out mixed ball milling on polyvinyl butyral and various types of powder, then drying the mixture to prepare a dry-pressed green body, then carrying out stirring mixing on the green body, anhydrous ethanol and polyvinyl butyral to load the ball milling powder, and spraying the mixture to coat a ceramic body, thereby preparing a far infrared thermal-shock-resistant ceramic. According to the preparation method, while the thermal shock resistance of the ceramic is kept, the toughness of the ceramic is enhanced.

The invention discloses a high-durability damping concrete and a preparation method thereof, and relates to several concretes and a preparation method thereof. The invention solves the problems of low damping capability and poor durability of the conventional concrete structure material per se. The high-durability damping concrete is prepared by stirring and mixing cements, rubber powder, water, medium sand, stones, and adding fibers and silicon powder. In the invention, c the loss factors of the high-durability damping concrete are improved by about 80-200 percent compared with that of pain concrete under the condition of different frequencies. After maintenance for 28 days, the concrete prepared by using the method has chloridion-resistant permeability and carbonizing-resistant capability both superior to that of blank concretes.

The invention discloses a method for preparing micro-nano copper through multi-axial compression, twisting and combined extrusion. The method comprises the following steps: (1) carrying out softening pre-treatment on a copper ingot blank; (2) carrying out multi-axial compression circulating extrusion on the blank obtained by the step (1) to generate great plastic deformation of the blank; fining the size of a crystal grain to obtain a sub-micron grade; (3) carrying out rounding treatment on the blank obtained by the step (2) to obtain a designed blank shape size; (4) carrying out destressing annealing treatment on the blank obtained by the step (3); (5) carrying out movable concave die twisting and extrusion on the blank obtained by the step (4), so as to generate multi-grade forward extrusion and compression neck deformation of the blank, and fining the size of the crystal grain to obtain a micro-nano grade; (6) carrying out microstructure sampling analysis on the blank obtained by the step (5) so as to guarantee tissue performance of the prepared micro-nano copper. The method provided by the invention can be applied to preparation of ultrafine crystals including pure copper, brass, white brass and the like and micro-nano materials.

The invention relates to zirconium oxide composite ceramic and a preparation method thereof, particularly relates to high-toughness and high-hardness composite ceramic and a preparation method thereof and belongs to the technical field of composite ceramic. The zirconium oxide composite ceramic comprises the following components in percentage by mass: 90.0-96.5% of ZrO2, 3.0-9.5% of TiB2 and less than or equal to 1% of other unavoidable impurities. By virtue of the method in which coating the surfaces of nano-TiO2 powder and nano-B2O3 powder with a layer of carbon and in situ synthesizing TiB2, the zirconium oxide composite ceramic with high toughness and high hardness is obtained. The preparation process is simple and the obtained high-hardness zirconium oxide composite ceramic can be used in partial application field of hard alloys and has broad application development prospects.

The invention discloses electrolytic copper foil manufacturing equipment. The electrolytic copper foil manufacturing equipment comprises an electrolytic copper foil mechanism, a stripping mechanism, acoarse roll prepressing mechanism, a high-frequency stamping mechanism, a finish roll rolling mechanism, a polishing and grinding mechanism and a collection mechanism. The high-frequency stamping mechanism comprises an elastic rolling device used for being arranged on one side of copper foil and a high-frequency stamping device used for being arranged on the other side of the copper foil. The polishing and grinding mechanism comprises a front surface polishing and grinding device used for polishing and grinding the front surface of the copper foil and a back surface polishing and grinding device used for polishing and grinding the back surface of the copper foil. The electrolytic copper foil manufacturing equipment provided by the invention is novel in design and reasonable in structure.The electrolytic copper foil manufacturing equipment strips off the electrolyzed copper foil from a cathode electrolytic roll and then conducts prepressing, high-frequency stamping, rolling and polishing to obtain the copper foil with the small mall, high surface smoothness, fewer microdefects and high density. The obtained copper foil has excellent elongation and tensile strength, is suitable forlithium batteries and can improve through quality of the lithium batteries.

Disclosed is a semisolid process for manufacturing an engine aluminum alloy cam shaft through a radial forging strain provocation method. Aluminum alloy rod materials are preheated and then forged in the radial direction, a blank is remelted again after radial forging, the aluminum alloy cam shaft is extruded and cast, and finally follow-up treatment is carried out on the aluminum alloy cam shaft in the radial direction. Through the process, the uniform aluminum alloy semisolid blank without micro defects can be manufactured, the aluminum alloy cam shaft which has a few micro structure defects and is good in mechanical performance can be formed, and the process is simple and easy to operate.

The invention relates to a preparation method for germanium-antimony-tellurium powder. The method comprises the following steps: step 1, synthesizing a binary alloy; step 2, preparing powder by crushing; step 3, performing homogenization on a mixed material; and step 4, synthesizing the ternary alloy powder. The invention also provides a preparation method for a germanium-antimony-tellurium targetmaterial. According to the preparation methods for the germanium-antimony-tellurium alloy and target material provided by the invention, the prepared germanium-antimony-tellurium alloy has a yield ofgreater than 98%; and the prepared target material has a relative density of greater than 98%, purity of 4N or more, the high relative density, uniform components and less microdefects.

The invention discloses a heat treatment process used for a Cr12MoV steel casting die surface. The heat treatment process comprises the following steps: preparing a sample; preparing a preparing a base used for balancing the self-cooling capacity of the die at all parts, wherein the upper end surface of the base is clung to the end surface of one side, back on to the die surface, of the die, and the base and the die form a part to be subjected to laser processing with an equal self-cooling capacity at all parts; performing laser quenching; performing 510 DEG C high-temperature tempering on the die for three times. According to the heat treatment process used for the Cr12MoV steel casting die surface, the steel material of the die surface is quickly heated by utilizing a focused laser beam, so that the steel material can generate phase deformation to form a martensite hardening layer, and the hardness requirement of the casting die surface is met.

The invention discloses a high-life composite grid suitable for a lead storage battery and a preparation method of the high-life composite grid and belongs to the technical field of preparation of lead storage batteries. According to the high-life composite grid, a lead alloy grid is taken as a base material, and a compact micro-arc anodic oxide film is formed on the base material in situ by adopting a composite pulse oxidation technology in a mixed acid solution. The thickness of the micro-arc anodic oxide film is 5-20 microns, the main ingredient is lead dioxide, and metallurgical grade bonding between the film and a matrix is achieved, so that the contact conductivity of the grid is fully ensured, the protective performance of the lead alloy matrix is effectively strengthened, the service life of the grid is greatly prolonged and the maintenance cost of the lead storage battery is reduced. The composite grid disclosed by the invention is applied to the lead storage battery, so thatthe corrosion weight loss of a positive grid during the period of normal-temperature cycle life is smaller than 60% and the life of the battery is prolonged by over 15%.

The invention discloses a mechanical-thermal coupled NiMnGa single crystal-contained twin crystal eliminating method. The mechanical-thermal coupled NiMnGa single crystal-contained twin crystal eliminating method comprises heating NiMnGa single crystal to 150-200 DEG C and performing thermal preservation for 5-15 min, then exerting single axial tension in the [100] direction of the NiMnGa single crystal with the temperature unchanged, and under the action of the tension, eliminating the twin crystal in the T-type structural martensitic single crystal of NiMnGa alloy. The invention also discloses a NiMnGa twin crystal-removed structure prepared through the mechanical-thermal coupled NiMnGa single crystal-contained twin crystal eliminating method. The mechanical-thermal coupled NiMnGa singlecrystal-contained twin crystal eliminating method can effectively eliminate twin crystal in alloy to achieve single-variant structures, endow materials with anisotropic properties and further obtainrecoverable stress-induced and magnetic field-induced large deformation. Meanwhile, the mechanical-thermal coupled NiMnGa single crystal-contained twin crystal eliminating method is simple in processand capable of effectively avoiding damage of cracks produced during technical processes to the materials.

The invention discloses a preparation method of a material for a high-strength and high-conductivity copper lead and belongs to the technical field of material processing. By taking high-purity electrolytic cathode copper as a base body, the lead is prepared by the following steps: mixing and preheating; smelting; insulating; pulling, wiredrawing and crystallizing; and annealing. The TR standard volume resistivity is less than or equal to 0.01707 ohm/cm<3> and the tensile strength reaches over 420MPa. The lead can better satisfy the performance requirement of leads in the electronic industrial field, can be further used for the field of high-conductivity and high-strength materials and has the advantages of simple process and low cost.

The invention discloses a method for reducing the breakage rate of quartz tubes during the preparation of scintillation single crystals. The method comprises the following steps: drawing a quartz tubeinto a hetero-shaped quartz tube with a thick upper part and a thin lower part, coating the inner wall of the quartz tube with a film, mounting a strain gage on the outer wall of the quartz tube, controlling the growth speed of a single crystal through the feedback of strain amplitude, preventing the breakage of the quartz tube, inverting the hetero-shaped quartz tube after a crystal is formed, and taking out a scintillation crystal after the scintillation crystal is cooled to room temperature. The method has the advantages that the inner wall of the hetero-shaped quartz tube is coated with the film before a single crystal material is loaded, conglutination between the hetero-shaped quartz tube and the produced crystal can be avoided, complete separation of the produced crystal and the hetero-shaped quartz tube body is facilitated, the quartz tube can be prevented from directly extruding the crystal, the method is convenient for reducing micro defects of the crystal, the probability of self-absorption of the crystal is reduced, the cracking risk of the crystal is reduced, the internal performance of the scintillation crystal is obviously improved, in addition, after crystal growthand cooling after accomplished, the quartz tube is not required to be broken to take out the crystal, all that is needed is to open the quartz tube and pour out the crystal, and the quartz tube can be reused after being cleaned.