High-strength high-toughness zirconium diboride-silicon carbide-zirconia ceramic-based composite material and preparation method thereof

A technology of zirconia ceramics and zirconium diboride, which is applied in the field of ceramic matrix composite materials and its preparation, can solve the problems of difficult sintering and low fracture toughness, and achieve the effects of easy sintering, improved fracture toughness, and improved reliability

Inactive Publication Date: 2011-05-18
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the invention is in order to solve the ZrB prepared by existing methods 2 Ceramic matrix composites have the problems of low fracture toughness an

Method used

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Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0008] Specific Embodiment 1: In this embodiment, the high-strength and high-toughness zirconium diboride-silicon carbide-zirconia ceramic matrix composite material is composed of 55% to 75% of zirconium diboride powder, 20% of silicon carbide powder and 5% by volume. % to 25% of zirconia fiber; among them, the volume purity of zirconium diboride powder is greater than 98%, and the particle size is 2 μm; the volume purity of silicon carbide powder is greater than 98%, and the particle size is 1 μm; The volume purity is greater than 98%, the diameter is 5-10 μm, and the length is 100-500 μm.

[0009] In this embodiment, zirconium diboride powder, silicon carbide powder and zirconium dioxide fiber are all existing commercially available materials.

specific Embodiment approach 2

[0010] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the high-strength and high-toughness zirconium diboride-silicon carbide-zirconia ceramic matrix composite material is composed of 55% zirconium diboride powder, 20% Made of silicon carbide powder and 25% zirconia fibers. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0011] Specific embodiment three: This embodiment is different from specific embodiment one in that the high-strength and high-toughness zirconium diboride-silicon carbide-zirconia ceramic matrix composite material is composed of 75% zirconium diboride powder, 20% Made of silicon carbide powder and 5% zirconia fiber. Others are the same as in the first embodiment.

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Abstract

The invention relates to a high-strength high-toughness zirconium diboride-silicon carbide-zirconia ceramic-based composite material and a preparation method thereof, which relate to a ceramic-based composite material and a preparation method thereof and solve the problems of low fracture toughness and sintering difficulty of a ZrB2 ceramic-based composite material prepared by a traditional method. The material is made of zirconium diboride powder, silicon carbide powder and zirconium diboride fibers. The method comprises the following steps of: 1. weighing and wetly mixing raw materials to obtain slurry; 2. drying the slurry and then grinding to obtain a mixed powdery material; 3. sintering, cooling and taking out the mixed powdery material to obtain the ceramic-based composite material. In the invention, the ZrO2 fibers are introduced into a zirconium diboride-silicon carbide ultrahigh-temperature ceramic-material system to improve the brittleness and the thermal-shock resisting performance of an ultrahigh-temperature ceramic material and improve the use reliability of the material. The ceramic composite material prepared by the method provided by the invention is easy to sinter, the fracture toughness of the ceramic composite material is 5.69-6.82MPa.m1/2, and the bending strength is 700.86-723.15MPa.

Description

technical field [0001] The invention relates to a ceramic matrix composite material and a preparation method thereof. Background technique [0002] As an important class of materials, ultra-high temperature ceramic materials are very promising high-temperature structural materials, which can maintain physical and chemical stability. Such materials mainly include transition metal borides, carbides and nitrides, all of which have melting points exceeding 3000°C. Among them, zirconium diboride (ZrB 2 ) because of its low theoretical density (6.09g / cm 3 ) and is considered to be one of the most promising aerospace materials. Zirconium diboride has dual characteristics of ceramics and metals, such as a high melting point of 3245°C, high hardness (Mohs hardness is 9; microhardness is 22.1GPa), excellent electrical conductivity (conductivity is 105s / m at room temperature) and Thermal conductivity (thermal conductivity 24.3W / (m K)) and other properties, as well as excellent che...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B35/58C04B35/622
Inventor 张幸红韩文波梁军林佳孙新胡平
Owner HARBIN INST OF TECH
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