Ceramic matrix composite and preparation method and application thereof

A composite material and ceramic-based technology, which is applied in the field of ultra-high temperature ceramic-based composite materials, can solve the problems of silicon carbide fiber or carbon fiber decomposition and damage, high preparation cost, and large grain size, so as to improve the sintering density and speed up the compaction speed , Improve the effect of packing density

Active Publication Date: 2014-02-05
DALIAN UNIV OF TECH
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  • Application Information

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Problems solved by technology

This leads to high preparation cost and long preparation cycle, which brings difficulties to the subsequent large-scale production of zirconium diboride ceramic matrix composites.
[0004] In addition, the fracture toughness value of zirconium diboride with hard and brittle characteristics is 2.1-3.5 MPa m 1/2 , its sensitivity to cracks and brittle fracture mode will lead to catastrophic damage, which has become the main reason for limiting the wide application of zirconium diboride ceramic matrix composites in the field of thermal protection materials
In the past, the high sintering temperature and long sintering time made the grains of zirconium diboride material rough and large in grain size, and it was impossib

Method used

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  • Ceramic matrix composite and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1) According to the proportion of 85% zirconium diboride, 10% zirconium disilicide, and 5% multi-walled carbon nanotubes in parts by mass, take 20.0000g zirconium diboride powder on an analytical balance with an accuracy of 0.0001mg ( Purity 99.5%, average particle size 2μm), 2.3529g zirconium disilicide powder (purity 99.5%, average particle size 1μm), 1.1765g multi-walled carbon nanotubes (purity 97.5%, outer diameter 20-40nm, length 5-15μm ).

[0038] 2) Put the above weighed zirconium diboride and zirconium disilicide powder together into a beaker for ultrasonic vibration dispersion for 30 minutes, and add absolute ethanol solution as a dispersion medium.

[0039] 3) Put the weighed multi-walled carbon nanotubes into a beaker for ultrasonic vibration dispersion for 30 minutes, and add absolute ethanol solution as a dispersion medium.

[0040] 4) Put the zirconium diboride and zirconium disilicide powder and the multi-walled carbon nanotube slurry that have been dis...

Embodiment 2

[0046] The sintering parameters in this embodiment are different from those in Embodiment 1. The second-step sintering temperature is set to 1550° C., and the others are the same as in Embodiment 1.

Embodiment 3

[0048] The sintering parameters of this embodiment are different from those of Embodiment 1. The second-step sintering temperature is set to 1650° C., and the others are the same as those of Embodiment 1.

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Abstract

The invention discloses a ceramic matrix composite and a preparation method and application thereof, belongs to the technical field of ultra-high temperature ceramic matrix composites, and relates to a preparation method of a high-strength, high-toughness, high-density and fine-grain organization material. Zirconium diboride powder is used as a matrix phase, and zirconium disilicide powder is used as a sintering aid, so that the optimum sintering temperature, sintering pressure and sintering time of the ceramic matrix composite are lower than the requirements of the hot pressing sintering technology in the prior art; a multi-wall carbon nanotube is used as an additive for improving the internal organization structure of the ceramic matrix composite, obviously reduces the crystal grain size of the ceramic matrix composite, and improves the breaking tenacity of the ceramic matrix composite to 6.98 MPa.m<1/2>. The preparation method uses a two-step hot pressing sintering technology with fast and low-temperature characteristics to prepare the zirconium diboride ceramic matrix composite with high density and mechanical properties, and facilitates the subsequent large-scale production preparation and fiber toughening technology.

Description

technical field [0001] The invention belongs to the technical field of ultra-high temperature ceramic-based composite materials, and relates to a zirconium diboride ceramic-based composite material with high strength and high toughness and a preparation method thereof, in particular to low-temperature, rapid preparation of high-density, fine-grained A two-step hot-pressing sintering method for zirconium diboride matrix composites with crystal structure. Background technique [0002] In the field of aerospace technology, the "sound barrier" problem (flight speed > Mach 1) caused by the compressibility of air has been solved, and the Bell x-1 project launched by the National Advisory Committee for Aeronautics (NACA) has made the aircraft speed exceed 1 Mach is possible, which is inseparable from the emergence of thermal protection materials. Traditional thermal protection materials can basically meet the requirements of supersonic flight. However, the birth of the concept ...

Claims

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Application Information

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IPC IPC(8): C04B35/58C04B35/622
Inventor 沙建军李建韦志强代吉祥
Owner DALIAN UNIV OF TECH
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