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Zirconium boride-silicon carbide laminated composite ultrahigh-temperature ceramic material and preparation method thereof

An ultra-high temperature ceramic and silicon carbide layer technology, applied in chemical instruments and methods, ceramic layered products, layered products, etc., can solve problems such as poor toughness, and achieve the advantages of suppressing stress field, improving fracture toughness and simple preparation process. Effect

Inactive Publication Date: 2011-09-14
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of poor toughness of existing boride ultra-high temperature ceramic matrix composite materials, and to provide a zirconium boride-silicon carbide layered composite ultra-high temperature ceramic material and its preparation method

Method used

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specific Embodiment approach 1

[0008] Specific implementation mode 1: In this embodiment, the zirconium boride-silicon carbide layered composite ultra-high temperature ceramic material is made of alternately laminated residual compressive stress layers and residual tensile stress layers, and the zirconium boride-silicon carbide layered composite ultra-high temperature ceramic material The outermost layer is the residual compressive stress layer, wherein the residual compressive stress layer is made of 60-80 parts by weight of zirconium boride and 20-40 parts of silicon carbide, and the residual tensile stress layer is made of 20-40 parts by weight. It is made of 70-90 parts of zirconium boride and 10-30 parts of silicon carbide, and the thickness ratio of the residual compressive stress layer and the residual tensile stress layer is 1:0.5-6.

[0009] The particle diameter of zirconium boride used in this embodiment is 2 μm, and the particle diameter of silicon carbide is 0.5 μm.

[0010] The content of sili...

specific Embodiment approach 2

[0013] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the total number of layers of zirconium boride-silicon carbide layered composite ultra-high temperature ceramic material is (2n-1)~(2n+1) layers, where n is an integer, 2≤n≤10. Others are the same as the first embodiment.

specific Embodiment approach 3

[0014] Embodiment 3: This embodiment differs from Embodiments 1 to 2 in that the residual compressive stress layer is made of 70 parts by weight of zirconium boride and 30 parts of silicon carbide. Others are the same as the specific embodiment 1 to 2.

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Abstract

The invention discloses a zirconium boride-silicon carbide laminated composite ultrahigh-temperature ceramic material and a preparation method thereof, relating to a ultrahigh-temperature ceramic material and a preparation method thereof, wherein the material can be used for solving the problem that the existing boride ultrahigh-temperature ceramic matrix composite material has poor toughness. The zirconium boride-silicon carbide laminated composite ultrahigh-temperature ceramic material is prepared by laminating residual compressive stress layers and residual tensile stress layers alternatively. The preparation method comprises the following steps: 1. weighing raw materials; 2. preparing residual compressive stress layer powder and residual tensile stress layer powder; 3. preparing a laminated mixture; 4. carrying out sintering and heat insulation on the laminated mixture to obtain the zirconium boride-silicon carbide laminated composite ultrahigh-temperature ceramic material. The fracture toughness value of the zirconium boride-silicon carbide laminated composite ultrahigh-temperature ceramic material can reach up to 10.4MPaml / 2. In the invention, the preparation process is simple, the cost is low, and the fracture toughness is improved without influencing the strength of the material.

Description

technical field [0001] The invention relates to an ultra-high temperature ceramic material and a preparation method. Background technique [0002] Ultra-high temperature ceramic material refers to a special ceramic material that can maintain physical and chemical stability in high temperature environment and reaction atmosphere. Such materials mainly include transition metal borides, carbides and nitrides, all of which have melting points exceeding 3000°C. Among them, transition metal borides have become the most advantageous high-temperature structural ceramic materials due to their high melting point, high thermal conductivity, high electrical conductivity, good chemical stability and thermal shock resistance. It has broad application prospects in extreme environments such as transatmospheric flight and rocket propulsion systems. Currently ZrB 2 The boride ultra-high temperature ceramic material system represented by -SiC has attracted the attention of many internationa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B18/00C04B35/66C04B35/58C04B35/565C04B35/622
Inventor 张幸红胡平韩文波周鹏何汝杰侯杨
Owner HARBIN INST OF TECH
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