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Injection molding reactive sintering B4C/SiC composite ceramic material and preparation method thereof

A composite ceramic and injection molding technology, applied in the field of ceramic injection molding, can solve the problems of difficult molding, difficult densification, low toughness, etc., and achieve the effects of improving plasticity, improving ceramic toughness, and high dimensional accuracy

Inactive Publication Date: 2016-04-20
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Ding Shuo et al [Ding Shuo, Wen Guangwu, Lei Tingquan. Research progress of boron carbide materials[J]. Materials Science and Technology, 2003,11(1):101-105.] pointed out that the main difficulty of boron carbide sintering is that it is difficult to densify and low toughness, and sintered at 2300°C under normal pressure, usually only a relative density of less than 80% can be obtained, and the mechanical properties of the product are low, and it is difficult to form parts with complex shapes
[0010] At present, there is no injection molding preparation reaction sintering B in China. 4 Patents and Literature Reports of C / SiC Composite Ceramic Materials

Method used

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  • Injection molding reactive sintering B4C/SiC composite ceramic material and preparation method thereof
  • Injection molding reactive sintering B4C/SiC composite ceramic material and preparation method thereof
  • Injection molding reactive sintering B4C/SiC composite ceramic material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0073] An injection molding reaction sintering B 4 C / SiC composite material is made of the following raw materials through mixing, kneading, injection, degreasing and sintering: 34gD 50 8μm boron carbide powder, 17gD 50 35μm boron carbide powder, 16gD 50 3μm silicon carbide powder, 8gD 50 40μm silicon carbide powder, 1gD 50 It is 1.5μm carbon powder, 2g stearic acid, 1g polyvinylpyrrolidone, 11g paraffin, 5g ethylene vinyl acetate copolymer, 5g polypropylene.

[0074] The preparation steps are as follows:

[0075] (1) Mixing

[0076] First, weigh carbon powder, stearic acid and polyvinylpyrrolidone respectively, stir them evenly in 150ml of ethanol, and then ultrasonically treat them for 1h, then dilute the D 50 8μm boron carbide powder, D 50 35μm boron carbide powder, D 50 3μm silicon carbide powder, D 50 Add silicon carbide micropowder of 40 μm to the ultrasonically treated mixture, use silicon carbide balls as the grinding medium, and ball mill for 2 hours to obtai...

Embodiment 2

[0088] An injection molding reaction sintering B 4 C / SiC composite material is made of the following raw materials through mixing, kneading, injection, degreasing and sintering: 35gD 50 8μm boron carbide powder, 20gD 50 35μm boron carbide powder, 14D 50 3μm silicon carbide powder, 6gD 50 40μm silicon carbide powder, 2gD 50 It is 1.5μm carbon powder, 2g stearic acid, 1g polyvinylpyrrolidone, 10g paraffin, 5g ethylene vinyl acetate copolymer, 5g polypropylene.

[0089] The preparation steps are as follows:

[0090] (1) Mixing

[0091] First, weigh carbon powder, stearic acid, and polyvinylpyrrolidone respectively, stir them evenly in a mixture of 100ml ethanol and 50ml deionized water, and then ultrasonically treat them for 1h, then place D 50 8μm boron carbide powder, D 50 35μm boron carbide powder, D 50 3μm silicon carbide powder, D 50 Add silicon carbide micropowder of 40 μm to the ultrasonically treated mixture, use silicon carbide balls as the grinding medium, and ...

Embodiment 3

[0103] An injection molding reaction sintering B 4 C / SiC composite material is made of the following raw materials through mixing, kneading, injection, degreasing and sintering: 32gD 50 8μm boron carbide powder, 18gD 50 35μm boron carbide powder, 16D 50 3μm silicon carbide powder, 9gD 50 40μm silicon carbide powder, 1gD 50 It is 1.5μm carbon powder, 2g stearic acid, 2g polyvinylpyrrolidone, 10g paraffin, 5g ethylene vinyl acetate copolymer, 5g polypropylene.

[0104] The preparation steps are as follows:

[0105] (1) Mixing

[0106] First, weigh carbon powder, stearic acid and polyvinylpyrrolidone respectively, stir them evenly in a mixture of 50ml ethanol and 100ml deionized water, and then ultrasonically treat them for 1h, then place D 50 8μm boron carbide powder, D 50 35μm boron carbide powder, D 50 3μm silicon carbide powder, D 50 Add silicon carbide micropowder of 40 μm to the ultrasonically treated mixture, use silicon carbide balls as the grinding medium, and b...

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Abstract

The invention relates to an injection molding reactive sintering B4C / SiC composite ceramic material and a preparation method thereof. The composite ceramic material is prepared from the following raw materials in percentage by weight by virtue of material mixing, milling, injection, degreasing and sintering: 45-60% of boron carbide, 15-30% of silicon carbide, 1-5% of charcoal powder, 1-3% of a surfactant, 0-2% of a dispersant, 6-15% of a lubricant, and 4-12% of a binding agent, wherein the sum of the used amounts of all the components is 100%. For the reactive sintering B4C / SiC composite ceramic material prepared by the method provided by the invention, the apparent porosity is lower than 0.30%, the bending strength is 300MPa or above, the hardness is more than 3.04GPa, and the fracture toughness is more than 4.27MPa.m<1 / 2>.

Description

technical field [0001] The invention relates to an injection molding reaction sintering B 4 A C / SiC composite ceramic material and a preparation method thereof belong to the field of ceramic injection molding. Background technique [0002] Boron carbide (B 4 C) is a material with hardness second only to diamond and cubic boron nitride, with high melting point, high wear resistance and low density (ρ v =2.52g / cm 3 ), excellent chemical stability and excellent neutron absorption capacity, has been widely used in chemical industry, nuclear power plant, aerospace and medical fields at home and abroad. However, due to its shortcomings such as low toughness, poor strength, and difficulty in densification and sintering, it seriously hinders the application of boron carbide ceramics in some special projects. It can be prepared by introducing high-strength and high-toughness silicon carbide materials combined with reaction sintering to improve its toughness, strength and densific...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/563C04B35/632C04B35/634C04B35/638C04B35/64
CPCC04B35/563C04B35/632C04B35/63404C04B35/63408C04B35/638C04B35/64C04B2235/3826C04B2235/48C04B2235/5436C04B2235/6022C04B2235/6562C04B2235/6567C04B2235/77
Inventor 张玉军张钊龚红宇王仙丽余锦程
Owner SHANDONG UNIV
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