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Boron carbide-based composite ceramic material and preparation process thereof

A composite ceramic and boron carbide technology, which is applied in the field of reaction sintering of B4C-based composite ceramics, can solve problems such as improving the fracture toughness of ceramics, and achieve the effects of inhibiting grain growth, reducing sintering temperature and uniform distribution.

Inactive Publication Date: 2019-09-20
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of these sintering aids did not make B 4 The fracture toughness of C ceramics is significantly improved

Method used

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  • Boron carbide-based composite ceramic material and preparation process thereof
  • Boron carbide-based composite ceramic material and preparation process thereof
  • Boron carbide-based composite ceramic material and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] This embodiment prepares B by in situ reaction hot pressing sintering 4 The sintering process of C-based composite ceramic materials is as follows:

[0035] Step 1: Preparation of reaction sintering hybrid powder

[0036] According to volume percentage, weigh 84.3% B 4 C powder, 9.4% Ti 3 SiC 2 powder and 6.3% Si powder, pour the three powders into a ball milling tank, use absolute alcohol as the ball milling medium, ball mill for 8 hours until completely mixed, and then place it in a vacuum drying oven at 50°C for 12 hours to obtain a reaction sintered mixed powder ;

[0037] Step 2: In situ reaction hot pressing sintering

[0038] Prepare a graphite mold with an inner diameter of 50mm, two matching graphite indenters, two graphite gaskets, and graphite paper; cut the graphite paper into two circular graphite papers with a diameter of 50mm and a rectangle that just covers the inner wall of the graphite mold Graphite paper: Paste the rectangular graphite paper on ...

Embodiment 2

[0042] This embodiment prepares B by in situ reaction hot pressing sintering 4 The sintering process of C-based composite ceramic materials is as follows:

[0043] Step 1: Preparation of reaction sintering hybrid powder

[0044] According to volume percentage, weigh 70.5% B 4 C powder, 17.6% Ti 3 SiC 2 powder and 11.8% Si powder, pour the three powders into a ball milling tank, use absolute alcohol as the ball milling medium, ball mill for 8 hours until they are completely mixed, and then place them in a vacuum drying oven at 50°C for 12 hours to obtain the reaction sintering mixed powder ;

[0045] Step 2: In situ reaction hot pressing sintering

[0046] Prepare a graphite mold with an inner diameter of 50mm, two matching graphite indenters, two graphite gaskets, and graphite paper; cut the graphite paper into two circular graphite papers with a diameter of 50mm and a rectangle that just covers the inner wall of the graphite mold Graphite paper: Paste the rectangular gr...

Embodiment 3

[0050] This embodiment prepares B by in situ reaction hot pressing sintering 4 The sintering process of C-based composite ceramic materials is as follows:

[0051] Step 1: Preparation of reaction sintering hybrid powder

[0052] According to volume percentage, weigh 58.3% B 4 C powder, 25% Ti 3 SiC 2 powder and 16.7% Si powder, pour the three powders into a ball milling tank, use absolute alcohol as the ball milling medium, ball mill for 8 hours until completely mixed, and then place them in a vacuum drying oven at 50°C for 12 hours to obtain the reaction sintering mixed powder ;

[0053] Step 2: In situ reaction hot pressing sintering

[0054] Prepare a graphite mold with an inner diameter of 50mm, two matching graphite indenters, two graphite gaskets, and graphite paper; cut the graphite paper into two circular graphite papers with a diameter of 50mm and a rectangle that just covers the inner wall of the graphite mold Graphite paper: Paste the rectangular graphite pape...

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Abstract

The invention discloses a boron carbide-based composite ceramic material and a preparation process thereof. The composite ceramic material is prepared by a vacuum hot-pressing sintering process of B4C, Ti3SiC2 and Si, and the proportion of raw materials by volume percentage is as follows: 9.4-25% of a Ti3SiC2 powder, 6.3-16.7% of a Si powder, and the balance a B4C powder. The process utilizes an in-situ reaction of B4C with Ti3SiC2 and Si to form a TiB2 and SiC strengthening and toughening phase with fine crystal grains and uniform distribution in the B4C matrix, B4C crystal grain growth is effectively inhibited, and the composite ceramic material has the characteristics of high density, good electrical conductivity, excellent comprehensive mechanical properties and the like, and has relatively high practical value.

Description

technical field [0001] The present invention relates to a B 4 C-based composite ceramic material and its preparation process, belonging to B 4 The field of reaction sintering of C-based composite ceramics. Background technique [0002] Boron carbide (B 4 C) Ceramics are attractive high-temperature functional-structural materials with excellent chemical and physical properties, such as good chemical stability, high hardness, low density, high melting point, and good wear resistance. Therefore, B 4 C has been applied in a wide range of fields, such as bulletproof armor, refractory materials, abrasive coatings, electronics, etc. In addition, due to the good neutron absorption capacity of boron, B 4 C is also widely used as a neutron absorber and shielding material in nuclear reactors. B 4 The poor sinterability and machinability of C ceramics, as well as its inherent brittleness, limit the B 4 Practical application of C ceramics, therefore need to develop B 4 C-based c...

Claims

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Application Information

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IPC IPC(8): C04B35/563C04B35/622C04B35/645C04B35/65
CPCC04B35/563C04B35/622C04B35/645C04B35/65C04B2235/3826C04B2235/3843C04B2235/428C04B2235/6562C04B2235/6565C04B2235/6567C04B2235/6581C04B2235/96
Inventor 钟志宏王睿魏仁伟吴玉程
Owner HEFEI UNIV OF TECH
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