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Nano-powder modified silicon carbide-boron carbide composite ceramic and preparation method thereof

A technology of nano-boron carbide and nano-silicon carbide, which is applied in the field of bullet-resistant ceramic materials, can solve the problems of no significant improvement in performance, low reliability of bullet-resistant ability, and high sintering temperature, so as to increase the crack propagation path, Lightweight bulletproof performance and good mechanical properties

Active Publication Date: 2022-06-07
YANTAI BRANCH NO 52 INST OF CHINA NORTH IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The SiC-B prepared in the above-mentioned prior art 4 The performance of C composite ceramics has not been greatly improved, and the hardness is lower than that of B 4 C ceramics, the strength is lower than SiC ceramics, and the sintering temperature is high, the efficiency is low, and the reliability of ballistic resistance is low

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  • Nano-powder modified silicon carbide-boron carbide composite ceramic and preparation method thereof
  • Nano-powder modified silicon carbide-boron carbide composite ceramic and preparation method thereof

Examples

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Embodiment 1

[0038] A nano-modified SiC-B 4 C multiphase ceramics, the composition of the raw materials and the mass fraction of each component are calculated according to the mass percentage: the mass ratio of silicon carbide powder to boron carbide powder is 4:1, and the two powders account for 98wt% of the total mass, The mass of carbon powder with a particle size of 20nm is 1wt%, and the mass of zirconia powder is 1wt%. Among them, the particle size of nano-SiC is 50nm, accounting for 20wt% of the SiC powder, the particle size of micro-SiC is 0.58μm, and the particle size of micron B is 50nm. 4 C particle size is 0.58μm;

[0039] The preparation method is:

[0040] The first step, nano-powder mixing ball milling: put nano-SiC and nano-carbon powder into the ball mill tank, add deionized water and dispersant for ball milling for 6 hours, and the ball milling speed is 400r / min, in which the ratio of ball to material is 3:1, and the ratio of liquid to material is 3:1. is 1:1; wherein, the...

Embodiment 2

[0048] A nano-modified SiC-B 4 C multiphase ceramics, the composition of the raw materials and the mass fraction of each component are calculated according to the mass percentage: the mass ratio of silicon carbide powder and boron carbide powder is 1:1, the two powders account for 96wt% of the total mass, and the particle size The mass of 50nm carbon powder is 2wt%, and the mass of zirconia is 2wt%. Among them, nano B 4 The particle size of C is 50nm, accounting for B 4 20wt% of C powder, micron B 4 The particle size of C is 0.8 μm, and the particle size of micron SiC is 0.8 μm;

[0049] The preparation method is:

[0050] The first step, nano-powder mixing ball milling: the nano-B 4 C, the nano carbon powder is loaded into the ball mill tank, deionized water and dispersant are added for ball milling for 8h, and the ball milling speed is 450r / min, wherein the ratio of ball to material is 3.5:1, and the ratio of liquid to material is 2:1; wherein, the dispersant is polyacry...

Embodiment 3

[0058] A nano-modified SiC-B 4 C multiphase ceramics, the composition of the raw materials and the mass fraction of each component are calculated according to the mass percentage: the mass ratio of silicon carbide powder and boron carbide powder is 1:4, the two powders account for 93wt% of the total mass, and the particle size The mass of carbon powder with a thickness of 50nm is 2wt%, the mass of zirconia is 2wt%, and the content of graphene with a thickness of 50nm is 3wt%; among them, the nano-B 4 The particle size of C is 70nm, accounting for B 4 20wt% of C powder; particle size of nano-SiC is 70nm, accounting for 10wt% of SiC powder; Micron B 4 The particle size of C is 1.0 μm, and the particle size of micron SiC is 1.0 μm;

[0059] The preparation method is:

[0060] The first step, nano-powder mixing ball milling: the nano-B 4 C. Nano carbon powder, nano SiC and nano graphene powder are loaded into the ball mill tank, deionized water and dispersant are added for bal...

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Abstract

The invention discloses a nano-powder modified silicon carbide-boron carbide composite ceramic, which is prepared from the following components in percentage by mass: 90 to 98 weight percent of silicon carbide powder and boron carbide powder, 1 to 5 weight percent of carbon powder, 1 to 5 weight percent of zirconium oxide powder and 1 to 5 weight percent of nano graphene powder, wherein the mass ratio of the silicon carbide powder to the boron carbide powder is (1: 4)-(4: 1); the silicon carbide powder comprises nano silicon carbide powder and micron silicon carbide powder, the mass of the nano silicon carbide powder is 5wt%-20wt%, the boron carbide powder comprises nano boron carbide powder and micron boron carbide powder, and the mass of the nano boron carbide powder is 5wt%-20wt%. The invention also provides a preparation method of the composite ceramic. The preparation method comprises the following steps: (1) primary nano-powder mixing; (2) secondary powder mixing; (3) spray granulation; (4) pressure forming; (5) presintering; and (6) final sintering. According to the preparation method, the SiC-B4C composite ceramic with improved hardness and strength can be prepared, the uniformity of the performance of the composite ceramic is improved, the sintering temperature is low, and the preparation efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of anti-elastic ceramic materials, in particular to a nano-powder modified silicon carbide-boron carbide composite ceramic and a preparation method thereof. Background technique [0002] With the continuous improvement of the demand for protective performance in the field of armor protection, there are more and more types of bullet-resistant ceramic materials. At present, zirconia toughened alumina ceramics (ZTA), silicon carbide ceramics (SiC), silicon carbide Boron ceramics (B 4 C), the application equipment mainly includes armored vehicles, helicopters, human protection, etc. [0003] At present, the demand for lightweight equipment has gradually replaced ZTA ceramics with SiC ceramics. 4 The higher price of C makes B 4 C ceramics are only used in the fields of helicopter protection and human protection, and are rarely used in the protection of armored vehicles with the greatest demand, which seriously...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B35/563C04B35/622
CPCC04B35/565C04B35/563C04B35/622C04B2235/3821C04B2235/3826C04B2235/422C04B2235/3244C04B2235/425C04B2235/6562C04B2235/6567C04B2235/77C04B2235/96Y02E30/30
Inventor 孙孟勇杨双燕张武高晓菊李国斌尹飞曲俊峰童鹤郭敏栾承华
Owner YANTAI BRANCH NO 52 INST OF CHINA NORTH IND GRP
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