Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

c/sic composite material surface coating system and preparation method thereof

A composite material and surface coating technology, which is applied in the field of high-temperature-resistant fiber-reinforced ceramic matrix composite materials, can solve the problems of limited temperature resistance of the glass phase, damage to the composite material substrate, and low diffusion coefficient, so as to improve oxidation resistance and erosion resistance Ability, avoid cracking or falling off, good chemical compatibility

Active Publication Date: 2016-10-05
NAT UNIV OF DEFENSE TECH
View PDF3 Cites 0 Cited by
  • 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
Blindly increasing the sintering temperature may not achieve the effect, but will cause damage to the composite substrate
Although the density can be improved by adding the outermost layer of the glass phase, the temperature resistance of the glass phase is limited, and the performance in a corrosive atmosphere is not ideal; (2) As time goes on, the SiC inner coating will gradually oxidize to SiO 2 , the generated gaseous by-products will cause the yttrium silicate coating to crack or fall off when it diffuses outward, thus affecting the long-term anti-oxidation effect of the coating; (3) Some preparation methods such as hot isostatic pressing, chemical vapor deposition, Electrophoretic deposition methods are difficult to apply to the preparation of surface coatings for components with complex shapes

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • c/sic composite material surface coating system and preparation method thereof
  • c/sic composite material surface coating system and preparation method thereof
  • c/sic composite material surface coating system and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A kind of C / SiC composite surface coating system of the present invention, such as figure 1 As shown, the surface coating system is set on the surface of the C / SiC composite substrate, and the surface coating system includes mullite (3Al 2 o 3 2SiO2 2 ) coating and yttrium silicate coating.

[0045] In this embodiment, the yttrium silicate coating is Y 2 Si 2 o 7 Single-phase coating with a single layer thickness of 30 μm. The thickness of the mullite coating is 15 μm.

[0046] A preparation method of the C / SiC composite material surface coating system of the above-mentioned present embodiment, comprising the following steps:

[0047] (1) Al 2 o 3 Sol and SiO 2 Sol (both commercially available) mixed, Al 2 o 3 and SiO 2 The mass ratio of Al is 1:1, and the Al 2 o 3 -SiO 2 Composite sol, as raw material for mullite coating.

[0048] (2) Raw materials for preparing yttrium silicate coating slurry: Silicone resin and Y 2 o 3 Powder (average particle size...

Embodiment 2

[0053] A kind of C / SiC composite surface coating system of the present invention, such as figure 1 As shown, the surface coating system is provided on the surface of the C / SiC composite substrate, and the surface coating system includes a mullite coating and an yttrium silicate coating arranged sequentially from bottom to top.

[0054] In the present embodiment, yttrium silicate coating is 30wt%Y 2 SiO 5 and 70wt%Y 2 Si 2 o 7 The hybrid coating has a single layer thickness of 75 μm. The thickness of the mullite coating is 25 μm.

[0055] A preparation method of the C / SiC composite material surface coating system of the above-mentioned present embodiment, comprising the following steps:

[0056] (1) Al 2 o 3 Sol and SiO 2 Sol mixing, Al 2 o 3 and SiO 2 The mass ratio of Al is 2:1, and the Al 2 o 3 -SiO 2 Composite sol, as raw material for mullite coating.

[0057] (2) Raw materials for preparing yttrium silicate coating slurry: Silicone resin and Y 2 o 3 Powde...

Embodiment 3

[0062] A kind of C / SiC composite surface coating system of the present invention, such as figure 1 As shown, the surface coating system is provided on the surface of the C / SiC composite substrate, and the surface coating system includes a mullite coating and an yttrium silicate coating arranged sequentially from bottom to top.

[0063] In this embodiment, the yttrium silicate coating is 30wt% Y from bottom to top (also from inside to outside) 2 SiO 5 and 70wt%Y 2 Si 2 o 7 mixed coating, 70wt%Y 2 SiO 5 and 30wt%Y 2 Si 2 o 7 Hybrid coating, Y 2 SiO 5 Single-phase coating, the thickness of each single layer is 35 μm, and the total thickness of the yttrium silicate coating is 105 μm. The thickness of the mullite coating is 21 μm.

[0064] A preparation method of the C / SiC composite material surface coating system of the above-mentioned present embodiment, comprising the following steps:

[0065] (1) Al 2 o 3 Sol and SiO 2 Sol mixing, Al 2 o 3 and SiO 2 The mass ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention discloses a C / SiC composite material surface coating system and a preparation method thereof. The surface coating system is arranged on the surface of the C / SiC composite material substrate, including mullite coating and yttrium silicate coating arranged sequentially from bottom to top. The preparation method includes (1) preparation of Al2O3-SiO2 composite sol; (2) preparation of slurry raw material for yttrium silicate coating; (3) preparation of mullite coating; (4) preparation of yttrium silicate single-layer coating or silicic acid Yttrium multilayer coating. The surface coating system of the C / SiC composite material of the present invention has the characteristics of high density and high temperature resistance, and its preparation method has universal engineering application.

Description

technical field [0001] The invention belongs to the field of high-temperature-resistant fiber-reinforced ceramic-based composite materials, and relates to a C / SiC composite material surface coating system and a preparation method thereof, in particular to a novel double-layer high-temperature-resistant and Oxidized coatings and methods for their preparation. Background technique [0002] Carbon fiber reinforced silicon carbide (C / SiC) composites have excellent properties such as high specific strength and specific modulus, high temperature resistance, high damage tolerance, corrosion resistance, etc., and are considered as a strategic thermal structural material. , energy, chemical and other fields have broad application prospects. As a thermal structural material, C / SiC composites face the problem of high-temperature oxidation failure during application. The main reason is that carbon fibers will be severely oxidized above 400 °C and there are a large number of pores and c...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/89
Inventor 马青松刘海韬蔡利辉
Owner NAT UNIV OF DEFENSE TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com