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A multi-functional boron carbide-based composite ceramic and its preparation method by reactive hot pressing sintering

A multi-phase ceramic, boron carbide-based technology, applied in the field of ceramic materials, can solve the problems of difficulty in ensuring the mechanical properties of boron carbide ceramics, and difficulty in achieving uniform dispersion of each phase, and achieves shortened preparation time, high fracture toughness and hardness. high effect

Active Publication Date: 2021-12-21
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Throughout the literature at home and abroad, in the prior art, when preparing boron carbide-based composite materials, it is mainly to directly mix various raw material powders and then sinter them. It is difficult to achieve uniform dispersion between the phases and ensure that boron carbide ceramics have excellent properties. Improve the comprehensive performance while improving the mechanical properties to realize the multifunctionality of boron carbide ceramics

Method used

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  • A multi-functional boron carbide-based composite ceramic and its preparation method by reactive hot pressing sintering
  • A multi-functional boron carbide-based composite ceramic and its preparation method by reactive hot pressing sintering
  • A multi-functional boron carbide-based composite ceramic and its preparation method by reactive hot pressing sintering

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A multifunctional boron carbide-based composite ceramics, the preparation method of which comprises the following steps:

[0038] 1) Weighing raw materials: the components and mass percentages of each raw material are: 47.8% of titanium carbonitride, 45.5% of amorphous boron, and 6.7% of silicon; SiC balls, the ball-to-material ratio is 6.5:1, the speed of the ball mill is 300rpm / min, the ball milling time is 2h, and the ball milling medium is absolute ethanol; after the ball milling is completed, the absolute ethanol and the The raw material powder is separated; then the raw material powder is placed in a vacuum drying oven at 60°C for 24 hours; the dried raw material powder is passed through a 200-mesh standard test sieve to make a mixed powder;

[0039] 2) Put the mixed powder in the graphite mold of the 916G-G Press type hot-press sintering furnace for reactive hot-press sintering. When the vacuum degree of the furnace reaches below 100mtorr, turn on the heating ele...

Embodiment 2

[0047] A multifunctional boron carbide-based composite ceramics, the preparation method of which comprises the following steps:

[0048] 1) Weigh raw materials: the mass percentages of each component of raw materials are: titanium carbonitride 49.8%, amorphous boron 43.2%, silicon 7.0%; The raw material powder after weighing is placed in polytetrafluoroethylene ball mill tank, and the grinding ball is SiC balls, the ball-to-material ratio is 6.5:1, the speed of the ball mill is 300rpm / min, the ball milling time is 2h, and the ball milling medium is absolute ethanol; after the ball milling is completed, the absolute ethanol and the The raw material powder is separated; then the raw material powder is placed in a vacuum drying oven at 60°C for 24 hours; the dried raw material powder is passed through a 200-mesh standard test sieve to make a mixed powder;

[0049] 2) Put the mixed powder in the graphite mold of the 916G-G Press type hot-press sintering furnace for reactive hot-pr...

Embodiment 3

[0054] A multifunctional boron carbide-based composite ceramics, the preparation method of which comprises the following steps:

[0055] 1) Weigh raw materials: the mass percentages of each component of the raw materials are: titanium carbonitride 52.1%, amorphous boron 40.6%, silicon 7.3%; SiC balls, the ball-to-material ratio is 6.5:1, the speed of the ball mill is 300rpm / min, the ball milling time is 2h, and the ball milling medium is absolute ethanol; after the ball milling is completed, the absolute ethanol and the The raw material powder is separated; then the raw material powder is placed in a vacuum drying oven at 60°C for 24 hours; the dried raw material powder is passed through a 200-mesh standard test sieve to make a mixed powder;

[0056] 2) Put the mixed powder in the graphite mold of the 916G-G Press type hot-press sintering furnace for reactive hot-press sintering. When the vacuum degree of the furnace reaches below 100mtorr, turn on the heating element for heat...

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Abstract

The invention relates to a multifunctional boron carbide-based multiphase ceramic and its preparation method by reaction hot pressing sintering. The raw material components of the multiphase ceramic and their mass percentages are: titanium carbonitride powder 47.8-52.1%, boron powder 40.6-45.5%, silicon powder 6.7-7.3%; the preparation method is: adding the raw material components into a ball mill tank for planetary ball mill wet mixing, drying and sieving, and then placing the resulting mixed powder in a graphite mold Obtained by reaction hot pressing and sintering. The indicators of the composite ceramic material are as follows: relative density up to 99.37%; high flexural strength up to 801MPa; high fracture toughness up to 5.31MPa m 1 / 2 ;Hardness up to 22.4GPa, good electrical conductivity, electrical conductivity up to 7.62×10 5 S / m, with excellent comprehensive performance, can be used for heat insulation, heat-resistant and wear-resistant parts in various heat engines such as gas turbines and automobile engines, and has multi-functional application prospects.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, and relates to a multifunctional boron carbide-based composite ceramic and a preparation method thereof by reaction hot pressing and sintering. Background technique [0002] Boron carbide (B 4 C) Ceramic materials have low density, high hardness, high elastic modulus, and good chemical stability and neutron absorption performance, so boron carbide ceramics are widely used in light armor, wear-resistant materials and nuclear industry and other fields . However, the shortcomings of boron carbide ceramics, which are difficult to sinter, difficult to process and low fracture toughness, greatly limit its wide application. The key problems that the application needs to solve. [0003] The most effective way to overcome the above shortcomings is to reduce the sintering temperature of boron carbide and improve the mechanical properties of the material by introducing second phase particles. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/563C04B35/645C04B35/65
CPCC04B35/563C04B35/645C04B35/65C04B2235/3856C04B2235/421C04B2235/428C04B2235/3813C04B2235/3826C04B2235/386C04B2235/77C04B2235/96
Inventor 王为民何强龙
Owner WUHAN UNIV OF TECH