High temperature anti-oxidation coating and slurry for same of Cf/SiC composite material and preparation method thereof

A high-temperature anti-oxidation, composite material technology, applied in chemical instruments and methods, layered products, ceramic layered products, etc., can solve the problems of difficult to achieve densification of the coating, difficult to ensure the uniformity of HfB2, etc., to improve the bonding force. Effect

Inactive Publication Date: 2009-12-30
NAT UNIV OF DEFENSE TECH
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitations of the preparation process, HfB 2 -SiC coatin

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] A kind of C of the present invention f / SiC composite high-temperature oxidation-resistant coating, the coating is a two-layer composite coating composed of two yttrium silicate composite coatings, which are composed of two different yttrium silicate composite coatings A slurry is prepared. The two kinds of different slurries used are all suspensions composed of solid phase components and organic carriers with a mass ratio of 7:3, but the solid phase components in the first slurry are 1: 1BaO-Al 2 o 3 -SiO 2 Glass powder and oxide mixed powder, while the solid phase component in the second slurry is BaO-Al with a mass ratio of 1:9 2 o 3 -SiO 2 Composed of glass powder and oxide mixed powder, the oxide mixed powder used is Y with a molar ratio of 1:2 2 o 3 Powder and SiO 2 powder composition.

[0085] The crystal form of yttrium silicate in the yttrium silicate composite coating of the present embodiment is Y 2 Si 2 o 7 , the final two yttrium silicate compo...

Embodiment 2

[0110] A kind of C of the present invention f / SiC composite high-temperature oxidation-resistant coating, the coating is a three-layer composite coating composed of three yttrium silicate composite coatings, which are composed of three different yttrium silicate composite coatings A slurry is prepared. The three different slurries used are all suspensions composed of solid phase components and organic carriers with a mass ratio of 7:3, but the solid phase components in the first slurry are made of solid phase components with a mass ratio of 1 : 1 BaO-Al 2 o 3 -SiO 2 Glass powder and oxide mixed powder, while the solid phase component in the second slurry is BaO-Al with a mass ratio of 1:9 2 o 3 -SiO 2 Composed of glass powder and oxide mixed powder, the solid phase component in the third slurry is BaO-Al with a mass ratio of 0:1 2 o 3 -SiO 2 Composition of glass powder and oxide mixed powder (ie no BaO-Al 2 o 3 -SiO 2 glass powder), the oxide mixed powder used is ...

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Abstract

The invention discloses a slurry for high temperature anti-oxidation coating of Cf/SiC composite material and a preparation method thereof; the slurry is suspension liquid containing solid-phase components and organic carrier in a mass ratio of (1-4):1, the solid-phase components comprise BaO-Al2O3-SiO2 glass powder and oxide mixed powder in a mass ratio of (0-1):1 and the oxide mixed powder comprises Y2O3 powder and SiO2 powder in a molar ratio of 1:2. The invention also discloses a high temperature anti-oxidation coating of Cf/SiC composite material which is prepared from the slurry and a specific preparation method thereof. The coating is yttrium silicate composite coating or multilayer composite coating which is superimposed with various yttrium silicate composite coatings. The coating prepared by the method of the invention has low expansion coefficient and sufficient consistency, suitable high temperature viscous flow property and strong chemical bond with the protected composite material.

Description

technical field [0001] The invention relates to a coating of a ceramic matrix composite material and a preparation process thereof, in particular to a C f Anti-oxidation coating of / SiC composite material and its preparation process. Background technique [0002] In carbon fiber reinforced ceramic matrix composites, C f / SiC composite material has low density (1.7~2.5g / cm3), high modulus (>100GPa), high strength (tensile strength>350MPa, flexural strength>500Mpa, fabric reinforcement), low thermal expansion coefficient (1.8×10 -6 ~4.1×10 -6 / ° C (20 ° C ~ 1000 ° C)), high thermal shock resistance (2100 ° C / s) and good chemical corrosion resistance and other characteristics, it is the most promising material in high temperature environments. In addition, C f The matrix of SiC / SiC composites has relatively good oxidation resistance, which is considered to be the successor to the C f Another new type of strategic material after / C composite material, developed ...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B41/81C04B41/85C04B41/89C03C12/00B32B18/00B32B33/00
Inventor 郑晓慧堵永国张为军
Owner NAT UNIV OF DEFENSE TECH
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