Rare earth silicate coating and method for preparing coating on surface of C/SiC composite material

A rare earth silicate and coating technology, applied in the direction of coating, etc., can solve the problems of limited shape of components, high preparation temperature, complicated preparation process, etc., achieve low preparation temperature, simple principle, and realize large-scale industrial production Effect

Active Publication Date: 2015-02-18
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In order to avoid the deficiencies of the prior art, the present invention proposes a rare earth silicate coating and a method for preparing a coating on the surface of a C / SiC composite material, which solves the problems in the prior art that the preparation temperature is too high, the shape of the component is limited and the The preparation process is more complex and other problems

Method used

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  • Rare earth silicate coating and method for preparing coating on surface of C/SiC composite material
  • Rare earth silicate coating and method for preparing coating on surface of C/SiC composite material
  • Rare earth silicate coating and method for preparing coating on surface of C/SiC composite material

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Effect test

Embodiment 1

[0031] Step 1: raw material preparation: yttrium oxide powder (average particle diameter 3 microns) wt30%, solvent ethanol and butanone each wt30%, dispersant triethyl phosphate wt2%, binding agent polyvinyl butyral wt3%, remove Each wt2% of foaming agent n-butyl alcohol and ethylene glycol, each wt3% of plasticizer glycerol and dioctyl phthalate;

[0032] Step 2: Casting method to obtain the initial coating of the composite material: the specific process is:

[0033]a. Mix the yttrium oxide powder, solvent ethanol and methyl ethyl ketone, and dispersant triethyl phosphate in the raw materials of step 1 according to the proportioning ratio and carry out ball milling. The ball milling time is 5h, and the ball milling drum speed is 120r / min;

[0034] b. Take out the aforementioned ball-milled slurry, and then add plasticizer glycerol and dioctyl phthalate, defoamer n-butanol and ethylene glycol, and binder polyvinyl butyral according to the ratio. Put into the drum type ball mi...

Embodiment 2

[0039] Step 1: raw material preparation: yttrium oxide powder (average particle diameter 3 microns) wt30%, solvent ethanol and butanone each wt30%, dispersant triethyl phosphate wt2%, binding agent polyvinyl butyral wt3%, remove Each wt2% of foaming agent n-butyl alcohol and ethylene glycol, each wt3% of plasticizer glycerol and dioctyl phthalate;

[0040] Step 2: Casting method to obtain the initial coating of the composite material: the specific process is:

[0041] a. Mix the yttrium oxide powder, solvent ethanol and methyl ethyl ketone, and dispersant triethyl phosphate in the raw materials of step 1 according to the proportioning ratio and carry out ball milling. The ball milling time is 5h, and the ball milling drum speed is 120r / min;

[0042] b. Take out the aforementioned ball-milled slurry, and then add plasticizer glycerol and dioctyl phthalate, defoamer n-butanol and ethylene glycol, and binder polyvinyl butyral according to the ratio. Put into the drum type ball m...

Embodiment 3

[0047] Step 1: raw material preparation: yttrium oxide powder (average particle diameter 3 microns) wt30%, solvent ethanol and butanone each wt30%, dispersant triethyl phosphate wt2%, binding agent polyvinyl butyral wt3%, remove Each wt2% of foaming agent n-butyl alcohol and ethylene glycol, each wt3% of plasticizer glycerol and dioctyl phthalate;

[0048] Step 2: Casting method to obtain the initial coating of the composite material: the specific process is:

[0049] a. Mix the yttrium oxide powder, solvent ethanol and methyl ethyl ketone, and dispersant triethyl phosphate in the raw materials of step 1 according to the proportioning ratio and carry out ball milling. The ball milling time is 5h, and the ball milling drum speed is 120r / min;

[0050] b. Take out the aforementioned ball-milled slurry, and then add plasticizer glycerol and dioctyl phthalate, defoamer n-butanol and ethylene glycol, and binder polyvinyl butyral according to the ratio. Put into the drum type ball m...

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Abstract

The invention relates to a rare earth silicate coating and a method for preparing a coating on the surface of a C/SiC composite material. In the method, a yttrium silicate coating and a ytterbium silicate coating with a relatively wide application prospect are synthesized by virtue of a chemical vapor reaction mechanism, combination of the coatings and a substrate is relatively tight, and the coatings are relatively dense. The method is simple in principle; the preparation temperature is relatively low; the coatings are not affected by the external shape of the substrate, so that large-scale industrial production can be achieved.

Description

technical field [0001] The invention relates to the field of preparation method of rare earth silicate coating of composite materials, and relates to a rare earth silicate coating and a method for preparing coating on the surface of C / SiC composite material. Background technique [0002] Continuously toughened silicon carbide ceramic matrix composites (including C / SiC composites and SiC / SiC composites) have high specific strength, high specific modulus, low density, excellent fracture toughness and excellent high-temperature mechanical properties, making them a It is a hotspot of research all over the world, and it is gradually applied to the aerospace field, becoming an ideal material for important thermal structural components. However, in the process of manufacturing such composite materials, due to the various chemical vapor infiltration (CVI) or precursor impregnation pyrolysis (PIP) processes themselves and the difference in thermal expansion coefficient between the fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D1/00C09D7/12C04B41/85
Inventor 刘永胜万佳佳张青成来飞张立同
Owner NORTHWESTERN POLYTECHNICAL UNIV
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