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Toughened silicon carbide ceramic and preparation method thereof

A technology of silicon carbide ceramics and toughened silicon carbide, which is applied in the field of toughened silicon carbide ceramics and its preparation, can solve the problems of high cost, affecting the quality uniformity of toughened silicon carbide ceramics, and rising costs, so as to achieve good hardness and overcome The effect of uneven ceramic quality and excellent performance

Inactive Publication Date: 2020-07-14
WEIFANG BUSINESS VOCATIONAL COLLEGE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Toughened silicon carbide ceramics containing silicon carbide whiskers or carbon fibers is indeed a type of silicon carbide ceramics with high toughness. The introduction of silicon carbide whiskers or carbon fibers for toughening can indeed greatly improve the toughness of silicon carbide ceramics. However, silicon carbide whiskers and carbon fibers with high aspect ratios are generally difficult to compare The production raw materials are mixed evenly, which affects the quality uniformity of the toughened silicon carbide ceramic products to a certain extent

Method used

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  • Toughened silicon carbide ceramic and preparation method thereof
  • Toughened silicon carbide ceramic and preparation method thereof

Examples

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Effect test

Embodiment 1

[0032] A toughened silicon carbide ceramics, in parts by weight, comprising the following components:

[0033] 90 parts of silicon carbide powder, 2 parts of boron carbide powder, 23 parts of carbon black, 3 parts of flaky alumina, 2 parts of magnesium fluoride, 0.8 parts of lanthanum oxide, 23 parts of carbon nanotubes, 4 parts of reinforcing fibers, Ti-Si- 4 parts of Fe alloy powder.

[0034] The particle size of silicon carbide powder is 1-3μm, the particle size of boron carbide powder is 0.5-1μm, the particle size of Ti-Si-Fe alloy powder is 0.2-0.8μm, and the reinforcing fiber is silicon carbide whisker and zirconia whisker The carbon nanotubes are carbon nanotubes with OD 1-2nm, length 1-30nm, CNTs purity>90wt%, Ash<1.5wt%.

[0035] The above-mentioned preparation method of toughened silicon carbide ceramics comprises the following steps:

[0036] (1) adding silicon carbide micropowder, carbon black, boron carbide micropowder and carbon nanotubes into ethanol for ultra...

Embodiment 2

[0043] A toughened silicon carbide ceramics, in parts by weight, comprising the following components:

[0044] 80 parts of silicon carbide micropowder, 3 parts of boron carbide micropowder, 15 parts of carbon black, 4 parts of flake alumina, 1 part of magnesium fluoride, 1 part of lanthanum oxide, 15 parts of carbon nanotube, 5 parts of reinforcing fiber, Ti-Si- 3 parts of Fe alloy powder.

[0045] The particle size of silicon carbide powder is 1-3μm, the particle size of boron carbide powder is 0.5-1μm, the particle size of Ti-Si-Fe alloy powder is 0.2-0.8μm, the reinforcing fiber is silicon carbide whisker, and the carbon nanotube is Carbon nanotubes with OD 1-2nm, length 1-30nm, CNTspurity>90wt%, Ash<1.5wt%.

[0046] The above-mentioned preparation method of toughened silicon carbide ceramics comprises the following steps:

[0047] (1) adding silicon carbide micropowder, carbon black, boron carbide micropowder and carbon nanotubes into ethanol for ultrasonication, the vol...

Embodiment 3

[0054] A toughened silicon carbide ceramics, in parts by weight, comprising the following components:

[0055] 100 parts of silicon carbide micropowder, 1 part of boron carbide micropowder, 30 parts of carbon black, 2 parts of flake alumina, 3 parts of magnesium fluoride, 0.5 part of lanthanum oxide, 30 parts of carbon nanotube, 3 parts of reinforcing fiber, Ti-Si- 5 parts of Fe alloy powder.

[0056] The particle size of silicon carbide powder is 1-3μm, the particle size of boron carbide powder is 0.5-1μm, the particle size of Ti-Si-Fe alloy powder is 0.2-0.8μm, the reinforcing fiber is titanium dioxide whisker, and the carbon nanotube is OD 1-2nm, length 1-30nm, CNTspurity>90wt%, Ash<1.5wt% carbon nanotubes.

[0057] The above-mentioned preparation method of toughened silicon carbide ceramics comprises the following steps:

[0058] (1) adding silicon carbide micropowder, carbon black, boron carbide micropowder and carbon nanotubes into ethanol for ultrasonication, and the ...

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Abstract

The invention discloses toughened silicon carbide ceramic and a preparation method thereof, belongs to the technical field of ceramic materials, silicon carbide micro-powder, boron carbide micro-powder, carbon black, flaky aluminum oxide, magnesium fluoride, lanthanum oxide, carbon nanotubes, reinforced fibers and Ti-Si-Fe alloy powder are used as raw materials, are fully mixed after two-stage ball milling, spherical powder is obtained while the raw materials are refined, the flowability of the powder is enhanced, and subsequent compression molding of the powder is facilitated; the toughened silicon carbide ceramic material prepared by the invention has excellent hardness, density, strength and toughness, can still maintain most of properties under a high-temperature condition, and overcomes the problem of non-uniform ceramic quality caused by difficult uniform mixing of whiskers and fibers with very high length-diameter ratio in the prior art, so that the silicon carbide ceramic material has excellent properties.

Description

technical field [0001] The invention relates to the technical field of ceramic materials, in particular to a toughened silicon carbide ceramic and a preparation method thereof. Background technique [0002] Silicon carbide ceramic materials have excellent characteristics such as high temperature strength, high temperature oxidation resistance, good wear resistance, good thermal stability, small thermal expansion coefficient, high thermal conductivity, high hardness, thermal shock resistance and chemical corrosion resistance. Automobiles, mechanical chemicals, environmental protection, space technology, information electronics, energy and other fields have increasingly wide applications, and have become an irreplaceable structural ceramic with excellent performance in many industrial fields. [0003] However, similar to other types of ceramics, silicon carbide ceramics also face the problem of brittleness. How to provide high-toughness silicon carbide ceramics is an important...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B35/622C04B35/80
CPCC04B35/565C04B35/622C04B2235/3821C04B2235/424C04B2235/3217C04B2235/445C04B2235/3227C04B2235/404C04B2235/405C04B2235/428C04B2235/5288C04B2235/5236C04B2235/5244C04B2235/5224C04B2235/6562C04B2235/6567C04B2235/6565C04B2235/77C04B2235/96
Inventor 戴培赟王东娟李晓丽张吉亮刘茹路金喜
Owner WEIFANG BUSINESS VOCATIONAL COLLEGE
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