Method for preparing rare earth silicate ceramics by chemical vapor deposition of oxygen-containing precursor

A chemical vapor deposition and rare earth silicate technology, which is applied in the field of preparing rare earth silicate ceramics by chemical vapor deposition of oxygen-containing precursors, can solve problems such as affecting the service life of SiCSiC materials.

Active Publication Date: 2021-07-06
NORTHWESTERN POLYTECHNICAL UNIV
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] As a new generation of engine hot end parts material, SiC f / SiC materials are susceptible to water vapor in the combustion environment at high temperatures (H 2 O) corrodes, forming volatile products (H 2 SiO 4 etc.), thus seriously affecting the SiC f / Life life of SiC material

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
  • Method for preparing rare earth silicate ceramics by chemical vapor deposition of oxygen-containing precursor
  • Method for preparing rare earth silicate ceramics by chemical vapor deposition of oxygen-containing precursor
  • Method for preparing rare earth silicate ceramics by chemical vapor deposition of oxygen-containing precursor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Step 1: Raw material preparation: wt20% yttrium oxide, wt75% water, wt2% binder polyvinyl alcohol, wt1% dispersant ammonium polyacrylate, wt2% sintering aid lithium carbonate

[0029] Step 2: Slurry configuration and impregnation:

[0030] a. The mixed solution of wt75% water, wt2% polyvinyl alcohol, wt1% ammonium polyacrylate and wt2% lithium carbonate was magnetically stirred, the stirring time was 30min, and the stirring rate was 100r / min;

[0031] b. Add wt20% yttrium oxide to the obtained uniformly mixed liquid, and perform ball milling, the rotating speed of the ball milling drum is 120r / min, and the ball milling time is 12h, to obtain a uniformly mixed yttrium oxide slurry;

[0032] c. Vacuum and pressure impregnate the semi-dense ceramic matrix composite with yttrium oxide slurry, and dry at 120°C.

[0033] Step 3: Preparation of yttrium silicate by chemical vapor deposition: CH 3 SiCl 3 As a precursor, CO 2 As oxygen source, hydrogen as carrier gas and dilu...

Embodiment 2

[0036] Step 1: Raw material preparation: wt20% yttrium oxide, wt75% water, wt2% binder polyvinyl alcohol, wt1% dispersant ammonium polyacrylate, wt2% sintering aid lithium carbonate

[0037] Step 2: Slurry configuration and impregnation:

[0038] a. The mixed solution of wt75% water, wt2% polyvinyl alcohol, wt1% ammonium polyacrylate and wt2% lithium carbonate was magnetically stirred, the stirring time was 30min, and the stirring rate was 100r / min;

[0039] b. Add wt20% yttrium oxide to the obtained uniformly mixed liquid, and perform ball milling, the rotating speed of the ball milling drum is 120r / min, and the ball milling time is 12h, to obtain a uniformly mixed yttrium oxide slurry;

[0040] c. Vacuum and pressure impregnate the semi-dense ceramic matrix composite with yttrium oxide slurry, and dry at 120°C.

[0041] Step 3: Preparation of yttrium silicate by chemical vapor deposition: CH 3 SiCl 3 As a precursor, CO 2 As oxygen source, hydrogen as carrier gas and dilu...

Embodiment 3

[0044] Step 1: Raw material preparation: wt20% yttrium oxide, wt75% water, wt2% binder polyvinyl alcohol, wt1% dispersant ammonium polyacrylate, wt2% sintering aid lithium carbonate

[0045] Step 2: Slurry configuration and impregnation:

[0046] a. The mixed solution of wt75% water, wt2% polyvinyl alcohol, wt1% ammonium polyacrylate and wt2% lithium carbonate was magnetically stirred, the stirring time was 30min, and the stirring rate was 100r / min;

[0047] b. Add wt20% yttrium oxide to the obtained uniformly mixed liquid, and perform ball milling, the rotating speed of the ball milling drum is 120r / min, and the ball milling time is 12h, to obtain a uniformly mixed yttrium oxide slurry;

[0048] c. Vacuum and pressure impregnate the semi-dense ceramic matrix composite with yttrium oxide slurry, and dry at 120°C.

[0049] Step 3: Preparation of yttrium silicate by chemical vapor deposition: CH 3 SiCl 3 As a precursor, CO 2 As oxygen source, hydrogen as carrier gas and dilu...

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
particle diameteraaaaaaaaaa
Login to view more

Abstract

The invention relates to a method for preparing rare earth silicate ceramics by chemical vapor deposition of an oxygen-containing precursor. Rare earth oxides are used as reactants, and CH 3 SiCl 3 As a precursor, CO 2 As an oxygen source, hydrogen as a carrier gas and dilution gas, and argon as a protective gas, rare earth silicate ceramics are obtained through chemical vapor deposition. It can be used to prepare rare earth silicate ceramic powder, and can also be used to prepare rare earth silicate ceramic coating, and rare earth silicate ceramic modified structural ceramics and ceramic matrix composite materials. The preparation temperature of the rare earth silicate ceramics of the present invention is low, which solves the problem that the preparation temperature of the rare earth silicate ceramics is too high. Vapor deposition provides a new method for preparing rare earth silicate ceramics and rare earth silicate modified ceramic matrix composites.

Description

technical field [0001] The invention belongs to the field of preparation methods of rare earth silicate ceramics, and relates to a method for preparing rare earth silicate ceramics by chemical vapor deposition of an oxygen-containing precursor. Background technique [0002] As a new generation of engine hot end parts material, SiC f / SiC materials are susceptible to water vapor in the combustion environment at high temperatures (H 2 O) corrodes, forming volatile products (H 2 SiO 4 etc.), thus seriously affecting the SiC f / SiC material life. Rare earth silicates have low volatilization rate, excellent water and oxygen corrosion resistance, chemical stability and low thermal expansion coefficient in high-velocity gas environment, and can be compared with SiC f / SiC material match. Rare earth silicate as SiC f Research on high-temperature oxidation-resistant coating materials for SiC materials has been carried out one after another. The reported techniques for prepari...

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): C04B35/573
CPCC04B35/573C04B2235/3203C04B2235/3225
Inventor 刘永胜贺芳董宁王晶高雨晴宋超坤
Owner NORTHWESTERN POLYTECHNICAL UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap