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Method for preparing environment barrier coating at low temperature

An environmental barrier coating and low-temperature technology, which is applied in the field of low-temperature preparation of environmental barrier coatings, can solve problems such as damage, and achieve the effects of easy diffusion, good performance, and simple implementation process

Inactive Publication Date: 2013-02-20
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problem of the slurry method is that the coating must be sintered at a higher temperature, such as using the slurry method to prepare BaO-SrO-Al on the CFCC-SiC composite material 2 o 3 -SiO 2 The sintering temperature of the (BSAS) coating is 1350°C, and the reinforcing fibers of CFCC-SiC composites are generally C fibers and SiC fibers. At such a high temperature, the C fibers or SiC fibers of the composite materials will be damaged to a certain extent.

Method used

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  • Method for preparing environment barrier coating at low temperature
  • Method for preparing environment barrier coating at low temperature
  • Method for preparing environment barrier coating at low temperature

Examples

Experimental program
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Effect test

Embodiment 1

[0029] 1. Add 40wt% BSAS powder to the polysiloxane precursor, and then mix 5wt% boric acid as a sintering aid. Ball mill for 30 minutes using a vibrating ball mill.

[0030] 2. Brush the mixed slurry onto the surface of the C / SiC sample and cure at 120°C for 10 minutes.

[0031] 3. Pass argon as a protective gas in a vacuum tube furnace, and heat-treat at 1200°C for 2 hours. A dense BSAS coating can be obtained.

[0032] 4. The performance assessment of the coating is carried out in the water-oxygen corrosion device. The conditions of the whole water-oxygen corrosion experiment are as follows: the temperature in the furnace is 1250 ° C, the atmosphere is 50% H 2 O-50%O 2 , the gas flow rate is 8.5×10 -4 m / s (the flow rate is an estimated value at room temperature), the pressure is 1 atm, and the entire water-oxygen corrosion time is 200 hours. From the cross-section of the sample after water and oxygen corrosion, it can be seen that the coated sample, the C fibers in th...

Embodiment 2

[0035] Example 2: Mixing Sc with polyazide silane as a precursor 2 Si 2 o 7 Powder preparation slurry, using Li 2 CO 3 Preparation of Sc at 1250°C as a sintering aid 2 Si 2 o 7 Environmental barrier coatings.

[0036]1. Add 70wt% Sc 2 Si 2 o 7 The powder was added to the precursor of polyazide silane, and then mixed with 5wt% Li 2 CO 3 As a sintering aid, add an appropriate amount of alcohol to reduce the viscosity of the slurry. Ball mill for 30 minutes using a vibrating ball mill.

[0037] 2. Brush the mixed slurry onto the surface of the C / SiC sample, and cure it at 120°C for 8 hours.

[0038] 3. Pass argon as a protective gas in a vacuum tube furnace, and heat-treat at 1250°C for 2 hours. can get dense Sc 2 Si 2 o 7 coating.

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Abstract

The invention relates to a method for preparing environment barrier coating at a low temperature. In the method, organosilicon as a precursor is mixed with proper powder to form filling materials, and then a proper amount of a sintering additive is added to prepare slurry. Specifically, organosilicon is added with 40%-80% of environment barrier coating powder and 2%-10% of the sintering additive.After ball milling for material mixing, a green coating can be prepared. On the basis of different environment barrier coating powder, a compact coating can be obtained by sintering the powder at a low temperature ranging from 1200DEG C to 1350DEG C. The method of the invention prepares the coating at a temperature of 100-200DEG C lower than the regular slurry method, so that carbon fibers or silicon carbide fibers in matrix materials can be protected effectively. In addition, the adding of the sintering additive does not influence the high temperature environment performance of the coating prepared.

Description

technical field [0001] The invention relates to a method for preparing an environmental barrier coating at low temperature, which is a method for reducing the preparation temperature of the environmental barrier coating by adding a sintering aid, and belongs to the field of coating preparation. Background technique [0002] Continuous fiber toughened silicon carbide ceramic composite (CFCC-SiC) has the characteristics of high specific strength, high specific modulus, ablation resistance, oxidation resistance and low density, and has become an ideal candidate material for aero-engine hot-end components. On the surface of CFCC-SiC composite material, the oxidation resistance of the composite material can be effectively improved by chemical vapor deposition of silicon carbide coating, but the silicon oxide protective film formed on the surface of the silicon carbide coating in the engine combustion chamber environment will be destroyed by the gas in the combustion chamber. Corr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/85
Inventor 王一光刘佳张立同成来飞
Owner NORTHWESTERN POLYTECHNICAL UNIV
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