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A joint enhanced sic f Method for High Temperature Water and Oxygen Corrosion Resistance of /sic Composite Materials

A composite material and corrosion performance technology, which is used in the preparation of SiCf/SiC composite material coatings, and jointly improves the high temperature water and oxygen corrosion resistance of SiCf/SiC composite materials. It can solve the problems of limiting the application of slurry method and achieve excellent water resistance Oxygen corrosion performance, tight bonding, and the effect of improving water and oxygen corrosion resistance

Active Publication Date: 2021-10-01
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current domestic third-generation SiC fiber has a temperature resistance of only 1450°C, which limits the application of the slurry method.

Method used

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  • A joint enhanced sic <sub>f</sub> Method for High Temperature Water and Oxygen Corrosion Resistance of /sic Composite Materials
  • A joint enhanced sic <sub>f</sub> Method for High Temperature Water and Oxygen Corrosion Resistance of /sic Composite Materials
  • A joint enhanced sic <sub>f</sub> Method for High Temperature Water and Oxygen Corrosion Resistance of /sic Composite Materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The present embodiment provides a kind of preparation method of Y-Al-Si-O glass powder, and this method comprises the following steps:

[0057] Step 1.1, adding oxide powder with a mass fraction of 25% and 75% absolute ethanol into a ball mill tank, milling for 8 to 12 hours to obtain a mixed powder slurry; drying the mixed powder slurry in an oven to obtain Y-Al - Si-O mixed powder;

[0058] The oxide powder is calculated in parts by weight and consists of the following raw materials: Y 2 o 3 Oxide powder is 30%, Al 2 o 3 Oxide powder is 15%, SiO 2 Oxide powder is 55%.

[0059] Step 1.2, put the dry Y-Al-Si-O mixed powder in an alumina crucible, put it into a heat treatment furnace for high-temperature heat treatment in an air atmosphere, heat treatment temperature 1600 ° C, keep warm for 3 hours, quickly place the crucible in cold water for rapid cooling, form a transparent glass block;

[0060] Step 1.3, adding the mass fraction of 25% glass block and 75% abso...

Embodiment 2

[0069] The present embodiment provides a kind of preparation method of Y-Al-Si-O glass powder, and this method comprises the following steps:

[0070] Step 1.1, adding oxide powder with a mass fraction of 25% and 75% absolute ethanol into a ball mill tank, milling for 8 to 12 hours to obtain a mixed powder slurry; drying the mixed powder slurry in an oven to obtain Y-Al - Si-O mixed powder;

[0071] The oxide powder is calculated in parts by weight and consists of the following raw materials: Y 2 o 3 Oxide powder is 25%, Al 2 o 3 Oxide powder is 15%, SiO 2 Oxide powder is 60%.

[0072] Step 1.2, put the dry Y-Al-Si-O mixed powder in an alumina crucible, put it into a heat treatment furnace for high-temperature heat treatment in an air atmosphere, heat treatment temperature 1700 ° C, keep warm for 2 hours, quickly place the crucible in cold water to quench, form a transparent glass block;

[0073] Step 1.3, adding the mass fraction of 25% glass block and 75% absolute eth...

Embodiment 3

[0077] This embodiment provides a joint improvement of SiC fA method for the high-temperature water-oxygen corrosion resistance of SiC composite materials, the method specifically includes the following steps:

[0078] Step 1: Preparation of glass paste:

[0079] Add the raw materials of the glass slurry into the ball mill jar, and ball mill for 3-5 hours to obtain the glass slurry;

[0080] Described glass paste, in parts by weight, is made up of following raw material: Y-Al-Si-O glass powder is 40%, binding agent is 20%, and solvent is 40%.

[0081] The Y-Al-Si-O glass powder is the Y-Al-Si-O glass powder prepared in Example 1.

[0082] The binder is a polysilylazide binder.

[0083] The solvent is absolute ethanol.

[0084] Step 2: Matrix modification:

[0085] Using the negative pressure impregnation method, the impregnation pressure is lower than -0.09MPa, and the SiC f / SiC composite material is immersed in the glass paste prepared in step 1 for 5min, and the impre...

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Abstract

The present invention provides a joint improvement of SiC f / SiC composite material high-temperature water-oxygen corrosion resistance method, the method adopts Y-Al-Si-O glass powder to be mixed with glass paste, then adopts glass paste as modifier to SiC f / SiC composite material for matrix modification, and then SiC after matrix modification f On the SiC composite material, the same glass paste is used as the coating material to increase the glass-ceramic coating, and the SiC with a modified matrix and a glass-ceramic coating is obtained. f / SiC composites, through the combination of matrix modification and glass-ceramic coating to enhance SiC f / SiC composite material high temperature water oxygen corrosion resistance. Y‑Al‑Si‑O glass can infiltrate SiC in molten state f / SiC inside, filling pores and defects, realizing matrix modification, improving the water-oxygen corrosion resistance of the matrix, and forming a complete, uniform and dense self-healing high-temperature water-oxygen resistant coating on the surface of the composite material, and effectively improving the high temperature of the material Water and oxygen corrosion resistance.

Description

technical field [0001] The invention belongs to the field of anti-corrosion materials and relates to a SiC f / SiC composite material coating preparation method, be specifically related to a kind of joint improvement SiC f / SiC composite material high temperature water oxygen corrosion resistance method. Background technique [0002] As the performance requirements of aeroengines are greatly improved, the research on developing heat engines with excellent performances such as high flow ratio, high thrust-to-weight ratio, and high inlet temperature has been attracting attention. High inlet temperature is an important factor to achieve high thrust-to-weight ratio and high thermal efficiency of the engine. For example, an outlet gas temperature of 1650°C corresponds to a thrust-to-weight ratio of 8, and an outlet gas temperature of 1850°C is required to achieve a thrust-to-weight ratio of 10 or 12. Most of the hot end parts of the engine are nickel-based superalloys, and the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/89
CPCC04B41/009C04B41/52C04B41/89C04B41/5022C04B35/565
Inventor 邓娟利路保福胡凯悦郑博瀚李昊
Owner CHANGAN UNIV