Method for preparing microstructural interlayer interface Mullite/yttrium silicate complex coating

A composite coating and intermediate layer technology, which is applied in the field of preparation of a microstructure structure interlayer interface Mullite/yttrium silicate composite coating, can solve the problem that the uniform coating composition is difficult to control, the coating performance is unfavorable, and the coating composition is difficult Control and other issues to achieve the effect of improving the performance of water vapor corrosion resistance, controllable composition and structure, and reducing surface roughness

Active Publication Date: 2016-11-09
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the preparation of C/SiC composite environmental barrier coatings by atmospheric plasma spraying technology can control and prepare lamellar structure, the coating has good adhesion, but there is a certain porosity in the coating, and the uniformity and composition of the coating are difficult. control, it is impossible to achieve multi-phase composite and densification of the coating; at the same time, due to the existence of thermal stress, vertical cracks appear in the coating, which will be detrimental to the later performance of the coating
The coating prepared by chemical vapor deposition needs to be carried out at a high temperature of 900-1200 ° C, and the deposition efficiency is low, the cost is high, the composition of the coating is difficult to control, and the exhaust gas is difficult to recycle.
The surface of the outer coating prepared by the sol-gel method is prone to cracking and the coating thickness is insu

Method used

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  • Method for preparing microstructural interlayer interface Mullite/yttrium silicate complex coating
  • Method for preparing microstructural interlayer interface Mullite/yttrium silicate complex coating
  • Method for preparing microstructural interlayer interface Mullite/yttrium silicate complex coating

Examples

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Effect test

Embodiment 1

[0030] A kind of preparation method of microstructure structure interlayer interface Mullite / yttrium silicate composite coating, adopts following steps:

[0031] (1) Take the commercially available mullite fiber and use absolute ethanol as the ball milling medium, use a planetary ball mill for 48 hours, and use an agate mortar to grind the powder after drying (0.3-1 μm); weigh a certain amount of the above mullite The powder was evenly dispersed in 1-methylpyrrolidone, stirred by magnetic force for 30 minutes, then added 0.5 wt% polyethylene glycol 6000 as a dispersant, continued magnetically stirred for 30 minutes, and then ultrasonically oscillated for 20 minutes by a cell ultrasonic pulverizer to obtain a uniform Suspension A, the mass ratio of mullite powder and 1-methylpyrrolidone in control suspension A is (3:5);

[0032] (2) Suspension A is transferred to the conical flask, while adding 10Wt% mixed binder polyvinyl alcohol and polyether sulfone resin, the control of its...

Embodiment 2

[0038] A kind of preparation method of microstructure structure interlayer interface Mullite / yttrium silicate composite coating, adopts following steps:

[0039] (1) Take the commercially available mullite fiber and use absolute ethanol as the ball milling medium, use a planetary ball mill for 48 hours, and use an agate mortar to grind the powder after drying (0.3-1 μm); weigh a certain amount of the above mullite The powder was evenly dispersed in 1-methylpyrrolidone, stirred by magnetic force for 40 minutes, then added 5wt% polyethylene glycol 6000 as a dispersant, continued magnetically stirred for 40 minutes, and then ultrasonically oscillated for 30 minutes by a cell ultrasonic pulverizer to obtain a uniform suspension Liquid A, the mass ratio of mullite powder and 1-methylpyrrolidone in the control suspension A is (2: 3);

[0040] (2) Suspension A is transferred in the Erlenmeyer flask, while adding 15Wt% mixed binder polyvinyl alcohol and polyethersulfone resin, the con...

Embodiment 3

[0047] A kind of preparation method of microstructure structure interlayer interface Mullite / yttrium silicate composite coating, adopts following steps:

[0048] (1) Take the commercially available mullite fiber and use absolute ethanol as the ball milling medium, use a planetary ball mill for 48 hours, and use an agate mortar to grind the powder after drying (0.3-1 μm); weigh a certain amount of the above mullite The powder was uniformly dispersed in 1-methylpyrrolidone, stirred by magnetic force for 50 minutes, then added 6.0 wt% polyethylene glycol 6000 as a dispersant, continued magnetically stirred for 50 minutes, and then ultrasonically oscillated by a cell ultrasonic pulverizer for 45 minutes to obtain a uniform Suspension A, the mass ratio of mullite powder and 1-methylpyrrolidone in control suspension A is (3:5);

[0049] (2) Suspension A is transferred to the conical flask, while adding 20Wt% mixed binder polyvinyl alcohol and polyethersulfone resin, the control of i...

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Abstract

The invention relates to a method for preparing a microstructural interlayer interface Mullite/yttrium silicate complex coating. The method comprises the steps that mullite fibers are ball-milled into powder, and the powder is dispersed into 1-methyl pyrrolidone to obtain an even suspension; a mixed adhesive is added to be mechanically stirred to be uniform, the mixture is injected to the surface of a C/SiC composite with a Si boding layer, and a mullite porous coating is obtained through sintering; yttrium nitrate hexahydrate and ethyl orthosilicate are taken to be dissolved in deionized water to obtain sol, the mullite porous coating is spin-coated with the sol after heat dipping, and repeated heat dipping-heat treatment is carried out to obtain the dense Mullite/yttrium silicate environmental barrier complex coating. Compared with the prior art, the method has the advantages that micropores are evenly distributed, interface binding is good, and crack growth is resisted.

Description

technical field [0001] The invention relates to a preparation method of a composite environmental barrier coating, in particular to a preparation method of a Mullite / yttrium silicate composite coating at the interface of a microstructure structure intermediate layer. Background technique [0002] Carbon fiber reinforced silicon carbide ceramic matrix composites (C / SiC, CMCs) is a new type of high-performance composite material. Since the 1970s, it has become a new hotspot in the field of structural materials research. C / SiC composite material has the following two advantages: on the one hand, the introduction of continuous carbon fiber improves the toughness of the composite material; Material. It has been more and more widely used in military and civil important fields, such as high-temperature parts of aero-engines, high-speed brake materials, rocket nozzles, thermal protection systems of space shuttles, first-wall materials of nuclear reactors, etc. However, the C / SiC c...

Claims

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Application Information

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IPC IPC(8): C04B41/87
CPCC04B41/5024C04B41/87
Inventor 郝巍赵晓峰肖平郭芳威王欣姜娟邹忠华单萧
Owner SHANGHAI JIAO TONG UNIV
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