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Surface coating system of fiber reinforced ceramic matrix composite material and preparation method therefor

A composite material and fiber-reinforced technology, which is applied in the field of high-temperature-resistant fiber-reinforced ceramic matrix composite materials, can solve the problems that cannot be directly synthesized, the outer coating cracks or falls off, the density of the mullite coating, and the adhesion are not ideal, etc.

Active Publication Date: 2015-12-02
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shortcomings of these schemes are: (1) The density of the yttrium silicate coating itself is not enough, and the oxygen in the Y 2 o 3 and SiO 2 The diffusion coefficients in are very low, but if the coating itself is not dense enough, this advantage will be lost a lot
Although this solution can avoid the problem of cracking or peeling off of the yttrium silicate outer coating caused by the oxidation of the SiC inner coating, it also exposes some shortcomings: (1) Due to the limitation of the sol synthesis technology, it is currently impossible to directly synthesize Stone stoichiometric ratio (Al 2 o 3 / SiO 2 Al with a mass ratio of 2.13:1 to 3.55:1) 2 o 3 -SiO 2 Sol, currently available Al of sol 2 o 3 / SiO 2 The highest mass ratio is only 2:1, and the conversion is surplus SiO 2 of mullite, these surplus SiO 2 Above 1450°C, it will cause carbothermal reduction reaction with free carbon in the composite material and destroy the coating. In an environment with high temperature water vapor, there will be a surplus of SiO 2 It also reacts to form gaseous Si(OH) 4 And rapid loss; (2) affected by Al 2 o 3 -SiO 2 Due to the influence of sol film-forming properties, cohesiveness and solid content, the density and adhesion of mullite coating are not ideal enough, and the preparation efficiency is low

Method used

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  • Surface coating system of fiber reinforced ceramic matrix composite material and preparation method therefor
  • Surface coating system of fiber reinforced ceramic matrix composite material and preparation method therefor
  • Surface coating system of fiber reinforced ceramic matrix composite material and preparation method therefor

Examples

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Embodiment 1

[0072] A high temperature resistant and oxidation resistant surface coating system of the present invention, such as figure 1 Shown. The surface coating system is arranged on the surface of the C / C composite material substrate, and includes a SiC inner coating, a mullite intermediate layer and an yttrium silicate outer coating arranged sequentially from bottom to top.

[0073] In this embodiment, the thickness of the SiC coating is 20 μm; in the chemical composition of the mullite coating, Al 2 O 3 With SiO 2 The mass ratio is 2.13:1, the thickness of the mullite coating is 60μm; the yttrium silicate coating is Y 2 Si 2 O 7 Single-phase coating with a single layer thickness of 80μm.

[0074] A method for preparing the surface coating system of the C / C composite material of this embodiment, including the following steps:

[0075] S1. Preparation of SiC coating slurry raw materials: according to the volume ratio of SiC powder / silicone resin 1:3 (the density of silicone resin used in th...

Embodiment 2

[0095] A high temperature resistant and oxidation resistant surface coating system of the present invention, such as figure 1 Shown. The surface coating system is arranged on the surface of the SiC / SiC composite material substrate, and includes a SiC layer, a mullite coating and an yttrium silicate coating arranged sequentially from bottom to top.

[0096] In this embodiment, the thickness of the SiC coating is 50μm; in the chemical composition of the mullite coating, Al 2 O 3 With SiO 2 The mass ratio is 3.55:1, the thickness of the mullite coating is 50μm; the yttrium silicate coating is Y 2 SiO 5 Single-phase coating with a single layer thickness of 50μm.

[0097] A method for preparing the surface coating system of a composite material of this embodiment described above includes the following steps:

[0098] S1. Slurry material for preparing SiC coating: According to the volume ratio of SiC powder / silicone resin 1:1.5 (the density of silicone resin used in this embodiment is 1.3g...

Embodiment 3

[0118] A high temperature resistant and oxidation resistant surface coating system of the present invention, such as figure 1 Shown. The surface coating system is arranged on the surface of the C / SiC composite material substrate, and includes a SiC inner coating, a mullite intermediate layer and an yttrium silicate outer coating arranged sequentially from bottom to top.

[0119] In this embodiment, the thickness of the SiC coating is 40 μm; in the chemical composition of the mullite coating, Al 2 O 3 With SiO 2 The mass ratio is 2.55:1, the thickness of the mullite coating is 50μm; the yttrium silicate coating is 70wt% Y 2 Si 2 O 7 +30wt%Y 2 SiO 5 Mixed-phase single-layer coating with a single-layer thickness of 100μm.

[0120] A method for preparing the surface coating system of a composite material of this embodiment described above includes the following steps:

[0121] S1. Slurry material for preparing SiC coating: According to the volume ratio of SiC powder / silicone resin 1:9 (t...

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Abstract

The present invention provides a surface coating system of fiber reinforced ceramic matrix composite material, wherein the surface coating system is arranged on the substrate surface of the fiber reinforced ceramic matrix composite material and comprises a Sic coating layer, a mullite coating layer and a yttrium silicate coating layer laid in order from bottom to top. The preparation method comprises the following steps of preparing sludge raw materials of the Sic coating layer, the mullite coating layer and the yttrium silicate coating layer respectively, and preparing the Sic coating layer, the mullite coating layer and the yttrium silicate coating layer. The present invention is used for the surface coating system of the fiber reinforced ceramic matrix composite material, has the advantages of high density, high temperature resistance and anti-oxidation.

Description

technical field [0001] The invention relates to the field of high temperature resistant fiber-reinforced ceramic matrix composite materials, relates to a surface coating system of fiber-reinforced ceramic matrix composite materials and a preparation method thereof, in particular to a new type of coating for protecting C / SiC, SiC / SiC, C A three-layer high-temperature-resistant and anti-oxidation coating for composite materials such as / C and a preparation method thereof. Background technique [0002] Fiber-reinforced ceramic matrix composite materials represented by carbon fiber-reinforced silicon carbide (C / SiC), silicon carbide fiber-reinforced silicon carbide (SiC / SiC), and carbon fiber-reinforced carbon (C / C) composite materials have high specific strength and specific modulus It is considered as a strategic thermal structural material and has broad application prospects in aerospace, transportation, energy, chemical and other fields. [0003] As thermal structural mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/89
Inventor 马青松
Owner NAT UNIV OF DEFENSE TECH
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