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A rapid preparation method of superhard and lightweight diamond-b4c-sic ternary composite ceramics

A ternary composite, -b4c-sic technology, which is applied in the field of lightweight ceramic materials, can solve the problems of limiting final application, long sintering time, and high energy consumption, and achieves simple preparation methods and technological processes, excellent mechanical properties, and preparation costs. low effect

Active Publication Date: 2021-06-01
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sintering time is long, the energy consumption is high, and the size of the prepared material is limited by the size of the high-pressure chamber, which limits its final application.

Method used

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  • A rapid preparation method of superhard and lightweight diamond-b4c-sic ternary composite ceramics
  • A rapid preparation method of superhard and lightweight diamond-b4c-sic ternary composite ceramics
  • A rapid preparation method of superhard and lightweight diamond-b4c-sic ternary composite ceramics

Examples

Experimental program
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Effect test

Embodiment 1

[0031]Example 1figure 1 versusfigure 2 :

[0032]The present invention provides a rapid preparation method of superhard and light diamond-B4C-SiC ternary composite ceramics, including the following steps:

[0033](1) Selection of raw material powder: Select the purity greater than 98%, the average particle diameter is 38 μm diamond, 1 μm of B powder, 3 μm Si powder, 40% by weight of the total mass of the raw material, B powder and Si according to the total mass of the raw material, respectively. The mass ratio of powder is 1: 1;

[0034](2) Preparation of the three-membered mixture: The above-described powder is mixed by the ball mill, the ball milling medium is ethanol, the ball milling time is 6 h; rotates the slurry of the ball to rotate, then put it into the vacuum drying box Drying, drying time is 24 h; after 100 mesh, 200 mesh sieve is obtained by diamond, Si, and B;

[0035](3) The in-situ reaction of the powder is rapidly sintered: the three-membered mixture is placed in the graphite mo...

Embodiment 2

[0038]Example 2figure 1 versusimage 3 :

[0039]The present invention provides a rapid preparation method of superhard and light diamond-B4C-SiC ternary composite ceramics, including the following steps:

[0040](1) Selection of raw material powder: Select the purity greater than 98%, the average particle diameter is 35 μm diamond, 1 μm of B powder, 3 μm Si powder, 45% by weight, B powder and Si of the total mass of the raw material, B powder and Si The mass ratio of powder is 2: 1;

[0041](2) Preparation of the three-dimensional mixed powder: The above-mentioned powder is mixed by a ball mill, the ball milling medium is ethanol, the ball milling time is 8 h; rotating the slurry of the ball grinding, then put it into the vacuum drying box Drying, drying time is 48 h; after 100 mesh, 200 mesh sieve is obtained from diamond, Si, and B mixed powder;

[0042](3) The in-situ reaction of the powder is rapidly sintered: the three-membered mixture is placed in the graphite mold, and the inner wall of ...

Embodiment 3

[0045]Example 3figure 1 versusFigure 4 :

[0046]The present invention provides a rapid preparation method of superhard and light diamond-B4C-SiC ternary composite ceramics, including the following steps:

[0047](1) Selection of raw material powder: Select the purity greater than 98%, the average particle diameter is 40 μm of diamond, 2 μm of B powder, 2 μm Si powder, 50% by weight, B powder and Si of the total mass, B powder and Si The mass ratio of powder is 1: 1;

[0048](2) Preparation of the three-dimensional mixed powder: The above-mentioned powder is mixed by the ball mill, the ball milling medium is ethanol, the ball milling time is 12 h; rotates the slurry of the ball to rotate, then put it into the vacuum drying box Drying, drying time is 30 h; after 100 mesh, 200 mesh sieve is obtained from diamond, Si, and B mixed powder;

[0049](3) The in-situ reaction of the powder is rapidly sintered: the three-membered mixture is placed in the graphite mold, and the inner wall of the graphite ...

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Abstract

The invention provides a rapid preparation method of ultra-hard light diamond-B4C-SiC ternary composite ceramics, comprising the following steps: selection of raw material powder; preparation of ternary mixed powder; rapid sintering of powder in situ reaction; Subsequent processing of the sample, the prepared superhard lightweight diamond‑B 4 B in C‑SiC ternary composite ceramics 4 The C‑SiC ceramic phase accounts for 70‑82%, and the diamond phase accounts for 18‑30%. In the present invention, diamond, boron powder and silicon powder are used as raw materials, and the ternary mixed powder is equipped with in-situ reaction and rapid sintering under the conditions of high heating rate and short holding time, which reduces the sintering temperature of ceramic densification, and effectively Inhibits the graphitization of diamond; at the same time, the liquid phase formed by silicon during sintering accelerates the reaction and promotes the densification of ternary composite ceramics; the preparation cost is low, the production cycle is short, and the diamond particles in the product are evenly dispersed in B 4 Between C and SiC ceramics, there is no graphite residue and the structure is dense, and it has the characteristics of ultra-high hardness, high strength, high toughness and light weight.

Description

Technical field[0001]The present invention relates to the technical field of lightweight ceramic materials, and more particularly to a rapid preparation method of superhal and light diamond-B4C-SiC ternate composite ceramics.Background technique[0002]Ultra-hard wear-resistant materials have important engineering application background. At present, the main wear-resistant materials include silicon carbide (SiC), boronized boron (B4C), boron, titanium (Tib2), Aluminum dioxide (Al2O3), But how to further increase material wear resistance, still need to solve problems.[0003]Diamonds have their own unique crystal structures, with higher hardness, strength, and elastic modulus than ceramic, is an ideal addition phase of the ceramic material hardness, and the high-elastic modulus of diamond makes it undertaken when composite Larger loads, due to their high hardness, strength characteristics, enhance the overall strength and hardness of the composite material. At present, the main preparati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/563C04B35/573
CPCC04B35/563C04B35/573C04B2235/427C04B2235/5436C04B2235/666
Inventor 王为民艾若蒙何强龙王爱阳
Owner WUHAN UNIV OF TECH
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