SiC nanoparticle and SiC whisker hybrid toughened ZrC-based superhigh temperature ceramic composite material and preparation method thereof

An ultra-high temperature ceramic and nanoparticle technology, which is applied in the field of ultra-high temperature ceramic composite materials and their preparation, can solve the problems of low density and high cost of ZrC-based ultra-high temperature ceramics, reduce pore defects, reduce price, and improve strength and toughness. Effect

Inactive Publication Date: 2012-04-25
HARBIN INST OF TECH
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  • Summary
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  • Description
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  • Application Information

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Problems solved by technology

[0003] The purpose of the invention is to solve the technical problems of low density and high cost of the existing ZrC-based ultra-high temperature ceramics, and to provide SiC nanoparticles and SiC whiskers hybrid toughened ZrC-based ultra-high temperature ceramic composite materials and its preparation method

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  • SiC nanoparticle and SiC whisker hybrid toughened ZrC-based superhigh temperature ceramic composite material and preparation method thereof
  • SiC nanoparticle and SiC whisker hybrid toughened ZrC-based superhigh temperature ceramic composite material and preparation method thereof
  • SiC nanoparticle and SiC whisker hybrid toughened ZrC-based superhigh temperature ceramic composite material and preparation method thereof

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specific Embodiment approach 1

[0009] Specific embodiment 1: The hybrid toughened ZrC-based ultra-high temperature ceramic composite material of SiC nanoparticles and SiC whiskers of this embodiment is made of SiC nanoparticles, SiC whiskers and a ZrC matrix; SiC nanoparticles and SiC whiskers are used as reinforcing phases In the ZrC matrix, the volume percentage of SiC nanoparticles is 5% to 15%, the volume percentage of SiC whiskers is 5% to 15%, and the volume percentage of ZrC matrix is ​​70% to 90%.

[0010] In this embodiment, a ZrC-based ultra-high temperature ceramic composite material is prepared by adding SiC whiskers and SiC nanoparticles to the ZrC matrix. Due to the good chemical stability of SiC, it matches the thermal expansion coefficient of the ZrC ceramic matrix. After hot pressing and sintering, the SiC nanoparticles Compared with the whiskers, it can be more evenly distributed in the matrix. During sintering, when the matrix grains grow up and meet the SiC nanoparticles, the interface energ...

specific Embodiment approach 2

[0011] Specific embodiment two: this embodiment is different from specific embodiment one in that the volume percentage of SiC nanoparticles is 8%-12%, the volume percentage of SiC whiskers is 8%-12%, and the volume of the ZrC matrix The percentage content is 76% to 84%. Others are the same as the first embodiment.

specific Embodiment approach 3

[0012] Specific embodiment three: This embodiment is different from specific embodiment one in that the volume percentage of SiC nanoparticles is 10%, the volume percentage of SiC whiskers is 10%, and the volume percentage of ZrC matrix is ​​80%. . Others are the same as the first embodiment.

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Abstract

The invention discloses a SiC nanoparticle and SiC whisker hybrid toughened ZrC-based superhigh temperature ceramic composite material and a preparation method thereof, relating to a superhigh temperature ceramic composite material and a preparation method thereof. The invention solves the technical problems of low density and high cost of ZrC-based superhigh temperature ceramic in the prior art.The SiC nanoparticle and SiC whisker hybrid toughened ZrC-based superhigh temperature ceramic composite material comprises SiC nanoparticle, SiC whisker and ZrC matrix, wherein, the SiC nanoparticle and SiC whisker as a reinforcing phase exist in the ZrC matrix. The preparation method comprises the following steps: dispersing the SiC whisker through ultrasonic waves, mixing the dispersed SiC whisker with SiC nanoparticle and ZrC powder, then carrying out ball milling and drying, and putting the mixed powder in a graphite die for hot pressed sintering to obtain the SiC nanoparticle and SiC whisker hybrid toughened ZrC-based superhigh temperature ceramic composite material. The prepared SiC nanoparticle and SiC whisker hybrid toughened ZrC-based superhigh temperature ceramic composite material has a density of 96-100 % and low cost, and can be applied in solid rocket engines or superspeed aircrafts.

Description

Technical field [0001] The invention relates to an ultra-high temperature ceramic composite material and a preparation method thereof. Background technique [0002] ZrC-based ultra-high temperature ceramics, similar to boride ceramics, are typical representatives of materials that can be used above 2000°C. They have a higher melting point, better chemical stability, higher elastic modulus, excellent conductivity, and higher It has excellent hardness, good thermal conductivity and other excellent properties. It is especially suitable for the nozzle throat lining, gas rudder, end cap and other parts of solid rocket motors. It can also be used as the nose cone, end and wing leading edge of ultra-high-speed aircraft. And other high temperature resistant structural components. However, single-phase ZrC ceramics have the disadvantages of low density and sintering properties, low strength and toughness, and poor oxidation resistance. In order to make up for these defects of single-pha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/81C04B35/80C04B35/56C04B35/622
Inventor 李金平张宇民刘时强孟松鹤韩杰才
Owner HARBIN INST OF TECH
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