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Silicon carbide and ceramic thick bulletproof plate, and preparation method and application thereof

A silicon carbide ceramic and bulletproof plate technology, applied in protective equipment, offensive equipment, armor, etc., can solve the problems of uneven thick silicon carbide ceramic plates, affecting material strength, black hearts, etc., to improve bulletproof effect, improve performance, and not easy subsidence effect

Active Publication Date: 2020-04-10
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, the object of the present invention is to provide a silicon carbide ceramic thick bullet-proof plate and its preparation method and application, to solve the problem that the reaction sintered silicon carbide ceramic thick plate has inhomogeneity, and defects such as black centers and cracks appear in sintering, which affect the material. strength

Method used

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  • Silicon carbide and ceramic thick bulletproof plate, and preparation method and application thereof
  • Silicon carbide and ceramic thick bulletproof plate, and preparation method and application thereof
  • Silicon carbide and ceramic thick bulletproof plate, and preparation method and application thereof

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Embodiment 1

[0053] This embodiment provides a method for preparing a silicon carbide ceramic thick bulletproof plate, comprising the following steps:

[0054] 1) Add 800g of lignocellulose powder H-500 (30μm in diameter, 1:1.5 aspect ratio), 8g of polyvinylpyrrolidone K90, and 12g of sodium carboxymethylcellulose into 2000g of absolute ethanol, stir evenly, and pass Add 2g of ammonia water with a concentration of 30wt% dropwise to adjust its pH value to 11 to obtain an ethanol slurry containing lignocellulose;

[0055] 2) Pour the slurry obtained in step 1) into an open container, dry at room temperature for 4 days, the ethanol is fully volatilized, and the slurry becomes loose particles containing lignocellulose; the loose particles are ground in a mortar for 1 The active powder that contains lignocellulose is formed within an hour; the active powder is passed through a 250 mesh sieve afterwards to obtain a powder with a certain particle size distribution;

[0056] 3) In 2000g deionized...

Embodiment 2

[0064] This embodiment provides a method for preparing a silicon carbide ceramic thick bulletproof plate, comprising the following steps:

[0065] 1) Add 1042.14g (lignocellulose powder H-500 with a diameter of 50μm and an aspect ratio (1:1.5)), 71.6g of polyvinylpyrrolidone K90 and 31.6g of sodium carboxymethylcellulose (CMC) to 3000g in sequence. In the ionized water, the ball mill was mixed for 24 hours to make it evenly mixed, and the ball milling speed was 30 rpm, and the pH value of the slurry was adjusted to 10 by dropping 2 g of ammonia water with a concentration of 25 wt%.

[0066] 2) Pour the water-based slurry obtained in step 1) into an open metal barrel, and air-dry it in an oven at 60°C for 4 days to form a dry block, and then grind the block with a mortar, forming an active powder containing lignocellulose; then passing the active powder through a 250-mesh sieve to obtain an active powder containing lignocellulose with a certain particle size distribution.

[0...

Embodiment 3

[0074] This embodiment provides a method for preparing a silicon carbide ceramic thick bulletproof plate, comprising the following steps:

[0075] 1) Add 802.4g of lignocellulose powder H-500 (50μm in diameter, 1:1.3 aspect ratio), 25g of polyvinylpyrrolidone, and 20g of sodium carboxymethylcellulose into 2500g of deionized water in turn, and mix them by ball milling for 24 hours. It is mixed evenly, the ball milling speed is 50 rpm, and the pH value is adjusted to 11 by dropping 2g of ammonia water with a concentration of 28wt%;

[0076] 2) Pour the water-based slurry obtained in step 1) into an open metal bucket, and air-dry it in an oven at 30°C for 3 days to form a dry block, and then grind the block with a mortar, forming an active powder containing lignocellulose; then passing the active powder through a 250-mesh sieve to obtain a powder with a certain particle size distribution;

[0077] 3) Add 600g of acrylamide and 60g of N-N'methylene bisacrylamide to 2000g of deion...

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Abstract

The invention relates to a silicon carbide and ceramic thick bulletproof plate, and a preparation method and an application thereof. The method comprises the following steps: carbon powder, a bindingagent and a suspending agent are sequentially added into a solvent, and mixing is performed until uniformity to obtain a slurry; the slurry is ball-milled, mixed, dried and crushed to form an active powder; the active powder is sieved; the obtained carbon powder and nano-silicon carbide micro-powder are introduced into a monomer solution, a dispersing agent is added for dispersion, and ball-milling blending is performed to obtain a blending system containing silicon carbide aggregate; then the blending system is subjected to vacuumizing and degassing treatment; an initiator is added, mixing isperformed until uniformity, then the obtained mixture is poured into a metal mold, and undergoes gel casting molding; the obtained colloidal plate undergoes constant-temperature and constant-humiditydrying and rotary drying; the obtained dried blank is pyrolyzed in a reducing atmosphere; and the obtained ceramic blank undergoes reactive sintering siliconizing treatment to obtain the silicon carbide and ceramic thick bulletproof plate. The carbon powder, such as lignocellulose, is in an irregular shape, so that particles are coarse and low in density, and are not prone to settling during dispersion.

Description

technical field [0001] The invention relates to the technical field of ceramic composite materials, in particular to a silicon carbide ceramic thick bulletproof plate and its preparation method and application. Background technique [0002] Special bulletproof ceramic materials including B 4 C. Al 2 o 3 , SiC, TiB 2 , AIN, Si 3 N 4 , Sialon (silicon aluminum oxynitride ceramics), etc., among which SiC ceramics have many excellent characteristics, such as good chemical stability, high specific strength and specific stiffness, good thermal shock resistance, high hardness, and excellent wear resistance And low coefficient of friction, etc., as a structural material, it is widely used as heat-resistant, wear-resistant, wear-reducing mechanical engineering materials and other structural components used in harsh environmental conditions, but as a bullet-proof ceramic, it is limited by the technology Development is slower. According to different sintering processes, silicon ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/573C04B35/575C04B35/622C04B35/626C04B35/80F41H5/00
CPCC04B35/573C04B35/575C04B35/622C04B35/6264C04B35/62615F41H5/00C04B2235/6023C04B2235/96C04B2235/422C04B2235/5454
Inventor 霍艳丽刘海林黄小婷胡传奇杨泰生贾志辉
Owner CHINA BUILDING MATERIALS ACAD
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