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B4C composite ceramic with composite structure as toughening phase and preparation method of B4C composite ceramic

A technology of composite structure and composite ceramics, which is applied in the field of B4C composite ceramics and its preparation, can solve the problems of small difference, low fracture toughness, and narrow the use range of C materials, and achieve the effect of high hardness and increased fracture toughness

Inactive Publication Date: 2016-08-24
HEBEI UNIV OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the toughening structure design ideas are to prepare different toughening phases (independent distribution) by simply changing the type of toughening phase or by using different in-situ reaction systems. 4 C composite ceramics are then verified for this toughening relative to B 4 C ceramic toughening effect, although different toughening relative to B 4 The toughening effect of C is different, but due to the limitation of the toughening effect of independent phase particles, the difference is not large. The different independent toughening phases of B prepared by various preparation methods 4 The fracture toughness of C composite ceramics mostly hovers around 3-6MPa.m 1 / 2 Between, no further breakthrough can be obtained, and the lower fracture toughness seriously reduces the B 4 C material use range, and reduce the B 4 The reliability of C ceramics

Method used

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  • B4C composite ceramic with composite structure as toughening phase and preparation method of B4C composite ceramic
  • B4C composite ceramic with composite structure as toughening phase and preparation method of B4C composite ceramic
  • B4C composite ceramic with composite structure as toughening phase and preparation method of B4C composite ceramic

Examples

Experimental program
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Effect test

Embodiment 1

[0038] A kind of B with composite structure as toughening phase 4 C composite ceramics, to B 4 C is the matrix phase, with (TiB 2 -SiC) composite structure as a toughening phase, including by weight percent: matrix phase B 4 C 95%, toughening phase (TiB 2 -SiC) composite structure 5%, in which TiB in the toughening phase 2 The amount ratio of the substance to SiC is 2:3.

[0039] By weight percentage, the B with composite structure as toughening phase 4 C composite ceramics consist of 1.07% B 4 C (particle size is 3um, purity is 97%), 2.31% TiC (particle size is 3μm, purity is 98%) and 1.62% Si powder (particle size is 200μm, purity is 99%) as raw materials through the mechanized process, and then with 95% of the same species B 4 The C powder is mixed twice, and finally prepared by high-pressure rapid sintering technology.

[0040] B described in this example 4 C-(TiB 2 -SiC) the preparation method of composite ceramics, concrete steps comprise:

[0041] ① Weigh B b...

Embodiment 2

[0046] A kind of B with composite structure as toughening phase 4 C composite ceramics, to B 4 C is the matrix phase, with (TiB 2 -SiC) composite structure as a toughening phase, including by weight percent: matrix phase B 4 C 95%, toughening phase (TiB 2 -SiC) composite structure 5%, in which TiB in the toughening phase 2 The amount ratio of the substance to SiC is 2:3.

[0047] By weight percentage, the composite ceramic consists of 1.07% B 4 C (particle size is 2um, purity is 97%), 2.31% TiC (particle size is 1μm, purity is 99%) and 1.62% Si powder (particle size is 10μm, purity is 99%) as raw materials through the mechanized process, and then with 95% of the same species B 4 The C powder is mixed twice, and finally prepared by high-pressure rapid sintering technology.

[0048] The composite structure described in this embodiment is used as the B of the toughening phase 4 The preparation method of C composite ceramics, concrete steps comprise:

[0049] ① Weigh B by...

Embodiment 3

[0054] The difference between this example and Example 2 is that the obtained composite structure is used as the toughening phase B 4 Matrix phase B in composite ceramics 4 C 90%, toughening phase (TiB 2 -SiC) composite structure 10%, in which TiB in the toughening phase 2 The amount ratio of the substance to SiC is 2:3.

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Abstract

The invention relates to B4C composite ceramic with a composite structure as a toughening phase. With B4C as a matrix phase and the (TiB2-SiC) composite structure as the composite toughening phase, the B4C composite ceramic is prepared from, in percentage by weight, 70%-95% of the matrix phase and 5%-30% of (TiB2-SiC) composite groups serving as the toughening phase, wherein the mole ratio of TiB2 and SiC in the toughening phase is 2:3. According to the composite ceramic, B4C, TiC and Si serving as raw materials in the stoichiometric ratio are subjected to mechano-chemical treatment, then mixed with B4C matrix powder for the second time and finally sintered quickly at high pressure, and the B4C composite ceramic is prepared. According to the composite ceramic, the light and hard (TiB2-SiC) composite groups are taken as the toughening phase, the limit that a single phase or multiple independently distributed phases are taken as a toughening phase of current B4C composite ceramic is broken through, and accordingly, the fracture toughness of the B4C ceramic is substantially improved on the premise that the B4C material keeps the properties of lightness and hardness.

Description

technical field [0001] The invention relates to a ceramic composite material and a preparation method thereof, in particular to a B ceramic with a composite structure as a toughening phase 4 C composite ceramics and its preparation method. Background technique [0002] B 4 C ceramic is an important engineering material with unique physical and chemical properties (high hardness, high modulus, low specific gravity, excellent high temperature resistance), especially the combination of ultra-high hardness and low density, which is the incomparable. Therefore, B 4 C ceramics have very important application prospects in the fields of modern industry, aerospace and national defense construction. In recent years, the B 4 The research on C ceramic materials has attracted great attention at home and abroad. However, B 4 The extremely high sintering temperature and low fracture toughness of C bring great difficulties to the preparation and application of materials. Developing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/563C04B35/622
CPCC04B35/563C04B35/622C04B2235/3813C04B2235/3826C04B2235/428C04B2235/5436
Inventor 张志晓张晓荣王为民傅正义王爱阳何强龙
Owner HEBEI UNIV OF ENG
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