Solid-phase sintering silicon carbide bulletproof ceramic and preparation method thereof

A technology of solid-phase sintering and silicon carbide, which is applied in the field of solid-phase sintering silicon carbide bulletproof ceramics and its preparation, can solve the problems of poor surface quality, density, hardness, corrosion resistance and low mechanical strength, etc., to improve performance and improve Uniformity and fluidity, effect of increasing surface energy

Active Publication Date: 2014-02-05
NINGXIA MACHINERY RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent "A method for preparing silicon carbide bulletproof ceramics", publication number CN 101967059A and Chinese patent "A silicon carbide bulletproof ceramic material and its preparation method", publication number CN 102219519A The silicon carbide ceramics involved are all reaction sintered Silicon carbide, although the silicon carbide bulletproof ceramics prepared by the above two methods has the advantage of simple production process, but because it contains a large amount of incompletely reacted free silicon, its density, hardness, corrosion resistance and mechanical strength are low, and the surface quality is low. poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) Mixing of raw materials: 70 kg of α-type silicon carbide powder with a particle size of 0.5 microns and a purity of 99.1%, 5 kg of boron carbide powder with a particle size of 0.5 microns and a purity of 91%, 20 kg of acrylic resin, polyethylene Alcohol 5 kg, put the above raw materials into the mixer and add pure water, after mixing for 6 hours, pass through a 60-mesh sieve;

[0024] 2) Spray granulation: The sieved slurry is granulated through a spray granulation tower, the inlet temperature of the spray granulation tower is 260°C, and the outlet temperature is 120°C; the granulated and dried material is passed through a 60-mesh sieve to obtain The bulk density is 0.85g / cm 3 , a material with a fluidity of 8s / 30g;

[0025] 3) Molding: Select a mold according to the shape of the desired product, put the above-mentioned granulated and dried material into the cavity of the mold, and perform pre-molding at room temperature under a pressure of 50MPa to obtain a green b...

Embodiment 2

[0029] 1) Mixing of raw materials: Take 90kg of α-type silicon carbide powder with a particle size of 0.7 microns and a purity of 99.5%, 0.1 kg of boron carbide powder with a particle size of 2.0 microns and a purity of 95%, 4 kg of phenolic resin, and dextrin 5.9 kg, put the above raw materials into the mixer and add pure water, after mixing for 48 hours, pass through a 120-mesh sieve;

[0030] 2) Spray granulation: The sieved slurry is granulated through a spray granulation tower, the inlet temperature of the spray granulation tower is 180°C, and the outlet temperature is 60°C; after the granulated material is passed through a 120-mesh sieve, loose Packing density is 0.92g / cm 3 , a material with a fluidity of 11 s / 30g;

[0031] 3) Forming: Select a mold according to the shape of the desired product, put the above-mentioned granulated powder into the cavity of the mold, and perform pre-molding at room temperature under a pressure of 200MPa to obtain a green body;

[0032] 4...

Embodiment 3

[0035] 1) Mixing of raw materials: Take 80kg of α-type silicon carbide powder with a particle size of 0.6 microns and a purity of 99.3%, 3 kg of boron carbide powder with a particle size of 1.0 microns and a purity of 92%, 7 kg of polyamide resin, carboxylate 10 kg of methyl cellulose, put the above raw materials into a mixer and add pure water, after mixing for 24 hours, pass through a 100-mesh sieve;

[0036]2) Spray granulation: The sieved slurry is granulated through a spray granulation tower, the inlet temperature of the spray granulation tower is 220°C, and the outlet temperature is 90°C; after the granulated material is passed through a 100-mesh sieve, loose Packing density is 0.9g / cm 3 , a material with a fluidity of 10s / 30g;

[0037] 3) Compression molding: select a mold according to the shape of the desired product, put the above-mentioned granulated powder into the cavity of the mold, and perform pre-molding at room temperature under a pressure of 150MPa to obtain ...

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Abstract

The invention relates to a preparation method of silicon carbide ceramic, and particularly relates to solid-phase sintering silicon carbide bulletproof ceramic and a preparation method thereof. The silicon carbide bulletproof ceramic comprises the following raw materials by weight percent: 70-90% of submicron alpha-silicon carbide, 0.1-5% of boron carbide, 4-20% of resin and 5-20% of organic binder, wherein the density of the solid-phase sintering silicon carbide bulletproof ceramic is 3.14-3.16 g/cm<3>; the relative density is 97-98%; the three-point bending strength is 480-560 Mpa. The preparation method of the solid-phase sintering silicon carbide bulletproof ceramic comprises the following steps: mixing the raw materials, spray drying, compression molding and vacuum sintering. The technical scheme disclosed by the invention has simple and reasonable craft processes; the production cost can be effectively reduced; the density, the HRA hardness and three-point bending of the product are higher than the performance of the existing solid-phase sintering and reaction sintering silicon carbide ceramic; meanwhile, the corrosion resistance and the surface quality are also superior to those of the product produced by the existing method.

Description

Technical field [0001] The invention relates to a preparation method of silicon carbide ceramics, in particular to solid phase sintered silicon carbide bulletproof ceramics and a preparation method thereof. Background technique [0002] At present, the most widely used ceramic bulletproof materials are mainly alumina ceramics, boron carbide ceramics and silicon carbide ceramics, as well as composite materials based on these ceramics. Compared with several other materials, silicon carbide is a ceramic material with strong covalent bonds, which has good mechanical properties and hardness, and its density is lower than that of alumina, which can reduce the weight of body armor, and its performance far exceeds that of alumina; Although the performance of boron carbide ceramics is better than that of silicon carbide ceramics, its production cost is higher than that of silicon carbide ceramics. [0003] Common silicon carbide ceramic products can be divided into reaction sintered...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/622
Inventor 赵文林段春雷宋伟
Owner NINGXIA MACHINERY RES INST
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