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A thermal/environmental barrier coating for ceramic matrix composites and its preparation method

A composite material and ceramic-based technology, which is applied in the field of thermal/environmental barrier coating and its preparation of ceramic-based composite materials, can solve the problems of low deposition rate, high cost, powder oxidation, etc., to ensure heat insulation performance and prolong high temperature Good service life and heat insulation effect

Active Publication Date: 2020-12-29
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for thermal / environmental barrier coatings of multilayer complex systems, the above preparation methods have certain limitations, including powder oxidation during spraying, low deposition rate, high cost, etc.

Method used

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  • A thermal/environmental barrier coating for ceramic matrix composites and its preparation method
  • A thermal/environmental barrier coating for ceramic matrix composites and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0034] In a second aspect, the present invention provides a method for preparing the thermal / environmental barrier coating described in the first aspect of the present invention, said method comprising the steps of:

[0035] (1) Silicon powder, ytterbium silicate powder and hafnium oxide powder are respectively loaded into the powder feeder of the low-pressure plasma spraying equipment and dried;

[0036] (2) fixing the ceramic matrix composite material on a rotary table in the vacuum chamber of the low-pressure plasma spraying equipment; and

[0037] (3) Prepare the silicon layer, the ytterbium silicate layer, and the transition layer formed by mixing hafnium oxide and ytterbium silicate sequentially on the surface of the ceramic matrix composite material (ceramic matrix composite material matrix) by low-pressure plasma spraying method. layer and the hafnium oxide layer, thereby producing the thermal / environmental barrier coating on the surface of the ceramic matrix composite...

Embodiment 1

[0061] ① Prepare SiC f / SiC ceramic matrix composite matrix original piece, the size is Φ25×4mm, the surface is polished on 400#, 800#, 1200# sandpaper respectively, put into acetone and ultrasonically cleaned for 10min before use.

[0062] ②Select Si and HfO after spray granulation 2 and Yb 2 SiO 5 powder, HfO 2 The particle size of the powder is 5-40μm, Yb 2 SiO 5 The particle size of the powder is 5-30 μm, and the particle size of the Si powder is 3-10 μm; the above three powders are added to the powder feeder of the low-pressure plasma spraying equipment, and the temperature is raised to 60 ° C and then dried for 4 hours.

[0063] ③The Si bonding layer was prepared on the substrate by low-pressure plasma spraying method: the pretreated SiC f / SiC ceramic matrix composite material matrix is ​​installed on the automatic workpiece rotating table in the vacuum chamber, and the process parameters are adjusted: spraying power 10kW, spraying current 500A, powder feeding rat...

Embodiment 2

[0070] Embodiment 2 is basically the same as Embodiment 1, the difference is:

[0071] In ⑤, after the jet is stabilized, open the HfO2 and Yb 2 SiO 5 The powder feeder, the powder feeding rate is 13.5g / min and 29.5g / min respectively, the deposition time is 1min, and the HfO with a thickness of 102μm is obtained 2 -Yb 2 SiO 5 Composition transition layer, where, HfO 2 with Yb 2 SiO 5 The molar ratio of the ingredients is 1:1.

[0072] The same test method as in Example 1 was used to test the heat insulation performance, high temperature water vapor corrosion resistance and the bonding strength of the hafnium oxide layer of the thermal / environmental barrier coating prepared in this example. The performance test results are shown in Table 1. Show.

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Abstract

The invention relates to a thermal / environment barrier coating based on a ceramic composite material and a preparation method of the thermal / environment barrier coating. The thermal / environment barrier coating comprises a silicon layer, a ytterbium silicate layer, a transition layer and a hafnium oxide layer in sequence from inside to outside, wherein the transition layer is made by mixing hafniumoxide and ytterbium silicate. The preparation method comprises the following steps: respectively loading silicon powder, ytterbium silicate powder and hafnium oxide powder into a powder conveyer of low-pressure plasma spraying equipment, and carrying out drying treatment; immobilizing a ceramic composite material on a rotating platform in a vacuum chamber of the low-pressure plasma spraying equipment; preparing the silicon layer, the ytterbium silicate layer, the transition layer and the hafnium oxide layer in sequence on the surface of the ceramic composite material by using a low-pressure plasma spraying method to obtain the thermal / environment barrier coating on the surface of the ceramic composite material. The thermal / environment barrier coating provided by the invention is good in thermal insulation effect and excellent in high-temperature moisture corrosion resistance, and the preparation method provided by the invention has the advantages of being high in deposition efficiency, low in cost, uniform in coating and the like, and the thermal / environment barrier coating can be rapidly and integrally prepared.

Description

technical field [0001] The invention belongs to the technical field of protective coating preparation, and in particular relates to a thermal / environmental barrier coating for ceramic matrix composite materials and a preparation method thereof. Background technique [0002] Due to the advantages of high temperature resistance, low density, high specific strength, and high toughness, ceramic matrix composites are often used to prepare key components such as aeroengine blades, which can significantly reduce fuel consumption and improve engine efficiency. However, due to the higher and higher service temperature of the internal blades of the engine, its service environment such as high-temperature water vapor, molten salt, etc. is becoming more and more harsh, and it is difficult to meet the requirements of the ceramic matrix composite material matrix, single-layer thermal barrier coating or single-layer environmental barrier coating alone. The demands of a new generation of hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/89
CPCC04B41/52C04B41/89C04B41/5096C04B41/5024C04B41/5042
Inventor 张宝鹏刘伟杨冰洋王鹏宋环君于艺于新民刘俊鹏
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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