A novel environmental barrier coating and structure for sic ceramic matrix composites

A composite material and environmental barrier technology, applied in the field of coating, can solve the problem of low comprehensive protection performance, and achieve the effect of excellent comprehensive performance, excellent corrosion resistance and good corrosion resistance.

Active Publication Date: 2022-04-12
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a new type of environmental barrier coating and structure for SiC ceramic matrix composite materials, which is used to overcome the defects of low comprehensive protection performance in the prior art

Method used

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  • A novel environmental barrier coating and structure for sic ceramic matrix composites
  • A novel environmental barrier coating and structure for sic ceramic matrix composites
  • A novel environmental barrier coating and structure for sic ceramic matrix composites

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preparation example Construction

[0049] The present invention also proposes a method for preparing a novel environmental barrier coating for SiC ceramic matrix composites as described above, comprising the following steps:

[0050] S1: Pre-treat the SiC ceramic composite substrate by sandblasting, ultrasonic cleaning and sufficient drying;

[0051] S2: Using the atmospheric plasma spraying process to prepare Ta-rich on the surface of the substrate obtained in S1 2 o 5 Hf 6 Ta 2 o 17 -Ta 2 o 5 Composite ceramic layer;

[0052] S3: Using the atmospheric plasma spraying process to prepare Hf-rich on the surface of the coating obtained in S2 6 Ta 2 o 17 Hf 6 Ta2 o 17 -Ta 2 o 5 Composite ceramic layer;

[0053] S4: Using the atmospheric plasma spraying process to prepare Hf on the surface of the coating obtained in S3 6 Ta 2 o 17 A single-phase ceramic layer is used to obtain a new type of environmental barrier coating.

[0054] The preparation method of the new environmental barrier coating for ...

Embodiment 1

[0056] This embodiment provides a novel environmental barrier coating for SiC ceramic matrix composites as a layered structure, including an inner layer, a middle layer and an outer layer; the coefficient of thermal expansion of the inner layer is 5×10 -6 / K, with a thickness of 80 μm.

[0057] The thermal expansion coefficient of the middle layer is 6×10 -6 / K, the thickness is 100 μm.

[0058] The thermal expansion coefficient of the outer layer is 8×10 -6 / K, with a thickness of 110 μm.

[0059] The preparation process of the novel environmental barrier coating is as follows:

[0060] S1: Use corundum sand for C f / SiC composite material substrate is pre-treated by sandblasting, and fully dried after ultrasonic cleaning;

[0061] S2: Using the atmospheric plasma spraying process, the C obtained in S1 f Ta-rich preparation on the substrate surface of / SiC composite material 2 o 5 Hf 6 Ta 2 o 17 -Ta 2 o 5 Inner layer, Hf in the powder used for spraying 6 Ta 2 o...

Embodiment 2

[0066] This embodiment provides a novel environmental barrier coating for SiC ceramic matrix composites as a layered structure, including an inner layer, a middle layer and an outer layer; the coefficient of thermal expansion of the inner layer is 6×10 -6 / K, the thickness is 90 μm.

[0067] The thermal expansion coefficient of the middle layer is 7×10 -6 / K, with a thickness of 120 μm.

[0068] The thermal expansion coefficient of the outer layer is 9×10 -6 / K, with a thickness of 120 μm.

[0069] The preparation process of the novel environmental barrier coating is as follows:

[0070] S1: Use corundum sand for C f / SiC composite material substrate is pre-treated by sandblasting, and fully dried after ultrasonic cleaning;

[0071] S2: Using the atmospheric plasma spraying process, the C obtained in S1 f Ta-rich preparation on the substrate surface of / SiC composite material 2 o 5 Hf 6 Ta 2 o 17 -Ta 2 o 5 Innermost layer, Hf of the powder used for spraying 6 Ta ...

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Abstract

The invention discloses a novel environmental barrier coating and structure for SiC ceramic matrix composite materials. The environmental barrier coating has a layered structure and the inner layer is Ta-rich 2 o 5 Hf 6 Ta 2 o 17 -Ta 2 o 5 Multiphase ceramic layer, Hf 6 Ta 2 o 17 with Ta 2 o 5 The molar ratio is 1:5~14; the middle layer is rich in Hf 6 Ta 2 o 17 Hf 6 Ta 2 o 17 -Ta 2 o 5 Multiphase ceramic layer, Hf 6 Ta 2 o 17 with Ta 2 o 5 The molar ratio is 1.2~2:1; the outer layer is Hf 6 Ta 2 o 17 For the single-phase ceramic layer, the molar ratio of Hf to Ta is 2.5~4:1; the thermal expansion coefficient of the inner layer<the thermal expansion coefficient of the middle layer<the thermal expansion coefficient of the outer layer. by Hf 6 Ta 2 o 17 with Ta 2 o 5 The coating system composed of two oxides has excellent comprehensive properties and can provide more effective surface protection for SiC ceramic matrix composites.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a novel environmental barrier coating and structure for SiC ceramic matrix composite materials. Background technique [0002] The continuous increase of turbine inlet temperature puts forward more stringent requirements on the comprehensive service performance of the high-temperature hot-end component materials of aero-engines. Fiber-toughened SiC ceramic matrix composites have become the most promising material system to replace superalloys due to their advantages such as low density, high specific strength, high specific modulus, and high temperature resistance. In a high-temperature corrosive environment, SiC ceramic matrix composites will react with corrosive media such as water vapor and molten salt in the environment to form volatile substances, resulting in a sharp decline in material performance. Environmental barrier coatings can isolate SiC ceramic matrix composites f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/89
CPCC04B41/009C04B41/5027C04B41/52C04B41/89C04B35/565
Inventor 余艺平李浩王松李伟
Owner NAT UNIV OF DEFENSE TECH
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