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Silicon nitride ceramic material and its preparation method and application, bulletproof board

A technology of silicon nitride ceramics and bulletproof inserts, applied in the structure of armor plates, etc., can solve the problems of weak anti-ballistic performance, limited application of ceramic materials, weak anti-multiple strike performance, etc.

Active Publication Date: 2021-07-09
HENGYANG KAIXIN SPECIAL MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main advantages of ceramics as armor protection materials are high strength and hardness, wear resistance and low density. However, ceramic materials produced by traditional technologies are easily broken and have weak resistance to multiple strikes, which makes the application of ceramic materials in the field of high-performance protective materials severely restricted
Moreover, the performance of today's projectile materials is gradually upgraded. For example, the projectiles of armor-piercing projectiles currently use high-density alloy steel, tungsten carbide or tungsten, depleted uranium alloy steel and other materials. Above, the armor-piercing ability is strong, the loss of flight speed is small, and it is extremely threatening, which makes armor protection materials face great challenges.
[0004] Currently there are mainly B 4 C, SiC and Al 2 o 3 Three types of ceramic bulletproof inserts, but they all have performance defects such as low fracture toughness and low bending strength, resulting in weak ballistic resistance, especially multiple strike resistance. Therefore, it is urgent to develop a fracture toughness and resistance Silicon nitride ceramic material with high bending strength and high ballistic resistance

Method used

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  • Silicon nitride ceramic material and its preparation method and application, bulletproof board
  • Silicon nitride ceramic material and its preparation method and application, bulletproof board
  • Silicon nitride ceramic material and its preparation method and application, bulletproof board

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preparation example Construction

[0049] One embodiment of the present invention provides a method for preparing a silicon nitride ceramic material, which includes the following steps S10-S40.

[0050] Step S10, providing the following raw materials: 80wt%-90wt% of silicon nitride powder, 1wt%-6wt% of simple carbon, 1wt%-10wt% of boron trioxide powder, the total of both nitride whiskers and carbide whiskers The amount is 1wt%-10wt%, the rare earth oxide is 1wt%-10wt%, and the binder is 1wt%-6wt%.

[0051] Step S20, mixing the raw materials obtained in step S10 with a solvent to make pulp, then drying and granulating to obtain granulated powder.

[0052] Step S30, making the granulated powder obtained in step S20 into a green body.

[0053] Step S40, sintering and molding the green body obtained in step S30 to obtain a silicon nitride ceramic material.

[0054] In the preparation method of the above-mentioned silicon nitride composite ceramic material, it includes mixing the above-mentioned raw materials with...

Embodiment 1

[0086] In terms of mass percentage, the following components are provided: 80wt% silicon nitride powder, 8wt% silicon carbide whiskers and silicon carbide whiskers, 3wt% graphite powder (325 mesh), 3wt% diboron trioxide powder (particle size D50 is 50 nanometers), 4wt% rare earth oxide and 2% binder; wherein, the purity of silicon nitride powder is 99.6%, the mass content of α-phase silicon nitride is 92%, the silicon nitride powder The particle size D50 is 0.6 microns; the aspect ratio of silicon carbide whiskers is 50:1, the aspect ratio of silicon nitride whiskers is 10:1, and the mass ratio of silicon nitride whiskers and silicon carbide whiskers is 1: 1; The rare earth oxide is selected from a mixture of yttrium oxide, lanthanum oxide, praseodymium oxide and scandium oxide, the particle size D50 is 1.0 micron, and the mass ratio of yttrium oxide, lanthanum oxide, praseodymium oxide and scandium oxide is 2:1:1:1 .

[0087] 2) The components provided in step 1) were mixed ...

Embodiment 2

[0091] 1) In terms of mass percentage, the following components are provided: 90wt% silicon nitride powder, 3wt% silicon carbide whiskers and silicon carbide whiskers, 1wt% graphite powder (325 mesh), 2wt% carbon dioxide Boron powder (particle size D50 is 50 nanometers), 2wt% rare earth oxide and 2% binder; wherein, the purity of silicon nitride powder is 99.6%, the mass content of α-phase silicon nitride is 92%, silicon nitride The particle size D50 of the powder is 0.6 microns; the aspect ratio of silicon carbide whiskers is 100:1, the aspect ratio of silicon nitride whiskers is 10:1, and the mass ratio of silicon nitride whiskers and silicon carbide whiskers is 1:2; the rare earth oxide is selected from a mixture of yttrium oxide, lanthanum oxide, praseodymium oxide and scandium oxide, the particle size D50 is 1.0 micron, and the mass ratio of yttrium oxide, lanthanum oxide, praseodymium oxide and scandium oxide is 2:1:1 :1.

[0092] Other steps and processing conditions t...

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Abstract

The invention relates to a silicon nitride ceramic material, a preparation method and application thereof, and a bulletproof inserting board. Among them, according to mass percentage, the raw material of silicon nitride ceramic material includes the following components: silicon nitride powder 80wt% ~ 90wt%, carbon simple substance 1wt% ~ 6wt%, diboron trioxide powder 1wt% ~ 10wt%, The total amount of the nitride whisker and the carbide whisker is 1wt%-10wt%, the rare earth oxide is 1wt%-10wt%, and the binder is 1wt%-6wt%. Using specific components and ratios, the flexural strength and fracture toughness of silicon carbide ceramic materials can be enhanced through the joint action of nitride whiskers and carbide whiskers and rare earth oxides on silicon nitride powder, and The combination of nitride whiskers and carbide whiskers can also improve the ballistic resistance of silicon carbide ceramic materials. At the same time, elemental carbon and diboron trioxide powder can form discontinuous boron carbide whisker components in the silicon nitride matrix under the catalysis of rare earth oxides, which not only reduces the surface density of the material, but also improves the hardness of the material and modulus of elasticity.

Description

technical field [0001] The invention relates to the technical field of silicon nitride material preparation, in particular to a silicon nitride ceramic material, a preparation method and application thereof, and a bulletproof insert. Background technique [0002] Ceramic materials have excellent comprehensive properties, including high specific stiffness, high specific strength and good chemical inertness. At the same time, ceramic materials also have the advantages of low density, high hardness and high compressive strength. The excellent properties of ceramic materials make them have great potential for application in armor protection systems. [0003] The main advantages of ceramics as armor protection materials are high strength and hardness, wear resistance and low density. However, ceramic materials produced by traditional technologies are easily broken and have weak resistance to multiple strikes, which makes the application of ceramic materials in the field of high-p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/596C04B35/593C04B35/81C04B35/622F41H5/02
CPCC04B35/593C04B35/622C04B2235/3224C04B2235/3225C04B2235/3227C04B2235/3409C04B2235/3826C04B2235/3873C04B2235/425C04B2235/5276C04B2235/5436C04B2235/5445C04B2235/5454C04B2235/608C04B2235/6562C04B2235/658C04B2235/77C04B2235/96F41H5/02
Inventor 曾小锋朱福林肖亮陈巨喜李勇全
Owner HENGYANG KAIXIN SPECIAL MATERIAL TECH CO LTD