Hafnium silicate environment barrier coating for ceramic-based composite material matrix and preparation method thereof

A composite material and ceramic-based technology, applied in the field of ceramics, can solve problems such as poor matching of thermal expansion coefficient, instability of thermal expansion coefficient of coating, poor crystallinity of coating, etc., achieve good high temperature stability, improve service life, Effect of increasing coating stability

Inactive Publication Date: 2020-06-05
WUHAN UNIV OF TECH
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

The current research on rare earth silicate materials is not mature. Usually, when using the atmospheric plasma spraying process to make rare earth silicate coatings, the superheated rare earth silicate particles are easy to decompose and form new phases. According to the size of the vapor pressure, silicon The Si element in the acid salt will volatilize in the form of gaseous SiO, resulting in poor crystallinity of the coating, and the existence of multiple phases affects the performance of the coating, resulting in instability of the thermal expansion coefficient of the coating, which matches the thermal expansion coefficient of SiC Sexual deterioration

Method used

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  • Hafnium silicate environment barrier coating for ceramic-based composite material matrix and preparation method thereof
  • Hafnium silicate environment barrier coating for ceramic-based composite material matrix and preparation method thereof

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preparation example Construction

[0032] A kind of HfSiO used in ceramic matrix composite matrix 4 A method for preparing an environmental barrier coating, comprising the following steps:

[0033] (1) HfO 2 and SiO 2 Mixing, wet mixing and ball milling on a ball mill, drying, grinding, sieving, and then sintering for high-temperature solid-state reaction;

[0034] (2) After the high-temperature solid-state reaction is over, add deionized water for slurry preparation, then ball mill, and then spray granulate to obtain HfSiO 4 powder material;

[0035] (3) Spray a layer of Si layer on the surface of the ceramic matrix composite material as the base layer, and then apply HfSiO 4 The powder material is sprayed on the surface of the base layer as a surface layer to form a multi-layer coating;

[0036] (4) The environmental barrier coating is obtained by heat-treating the multi-layer coating.

[0037] Further, HfO 2 and SiO 2 The ratio is 1:1~2:1.

[0038] Further, the ball milling time in the step (1) is 2...

Embodiment 1

[0046] Coating preparation:

[0047] (1) SiO 2 and HfO 2 The powders are mixed at a ratio of 1:1, wet-mixed and ball-milled on a ball mill for 24 hours, dried, ground, passed through a 250-mesh sieve, and then sintered in a high-temperature furnace at 1600°C for high-temperature solid-state reaction;

[0048] (2) After the high-temperature solid-state reaction is completed, add deionized water for slurry preparation, ball milling for 24 hours, and spray granulation to obtain HfSiO 4 Powder material (particle size 35~125μm);

[0049] (3) Use plasma spraying technology to spray a Si layer on the ceramic matrix composite material as the bottom layer, the thickness is 100 μm, the spraying power is 40kW, and the spraying distance is 110mm; use the plasma spraying technology to spray the surface layer on the bottom layer, and the surface layer material is HfSiO 4 , the thickness of the surface layer is 250μm, the spraying power is 40kW, and the spraying distance is 110mm; a multi...

Embodiment 2

[0057] Coating preparation:

[0058] (1) SiO 2 and HfO 2 The powder is mixed according to 1.5:1, wet-mixed and ball-milled on a ball mill for 24 hours, dried, ground, passed through a 250-mesh sieve, and then sintered in a high-temperature furnace at 1500°C for high-temperature solid-state reaction;

[0059] (2) After the high-temperature solid-state reaction is completed, add deionized water for slurry preparation, ball milling for 24 hours, and spray granulation to obtain HfSiO 4 Powder material (particle size 35~125μm);

[0060] (3) Use plasma spraying technology to spray a Si layer on the ceramic matrix composite material as the bottom layer, the thickness is 90 μm, the spraying power is 35kW, and the spraying distance is 100mm; use the plasma spraying technology to spray the surface layer on the bottom layer, and the surface layer material is HfSiO 4 , the thickness of the surface layer is 300μm, the spraying power is 35kW, and the spraying distance is 100mm; a multi-l...

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Abstract

The invention provides a hafnium silicate environment barrier coating for a ceramic-based composite material matrix and a preparation method thereof. The preparation method comprises the following steps: (1) mixing HfO2 and SiO2, carrying out wet mixing and ball milling on a ball mill, drying, grinding, sieving, sintering, and carrying out a high-temperature solid-phase reaction; (2) after the high-temperature solid-phase reaction is finished, adding deionized water for slurry preparation, then performing ball milling, and performing spray granulation to obtain an HfSiO4 powder material; (3) firstly spraying a Si layer on the surface of a ceramic-based composite matrix as a priming coat, and then spraying the HfSiO4 powder material on the surface of the priming coat as a surface layer to form a multi-layer coating; and (4) carrying out a heat treatment on the multi-layer coating to obtain the environmental barrier coating. Due to the added heat treatment, the crystallinity of the HfSiO4 surface layer is improved, the binding force of each layer of the coating is better, the stability is higher, and the water and oxygen resistance of the environment barrier coating is greatly improved. The provided preparation method is simple and easy to control, and is easy for industrial production and application.

Description

technical field [0001] The invention belongs to the technical field of ceramics, and in particular relates to a hafnium silicate environmental barrier coating for a ceramic matrix composite material substrate and a preparation method thereof. Background technique [0002] As one of the key components of power machinery equipment, gas turbine engine (gas turbine) plays an extremely important role in aviation, ships, generator sets and other fields. The development level of gas turbines is an important indicator to measure a country's military level. With the development of the country's military industry, the demand for gas turbines is also increasing. The optimization of thermal efficiency, fuel consumption, thrust-to-weight ratio and service life of gas turbines will inevitably lead to continuous increase in the combustion temperature of gas turbines. The maximum operating temperature of the currently known single crystal nickel-based superalloy is 1150 °C, while the opera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/16C04B35/622C04B35/66
CPCC04B35/16C04B35/62222C04B35/66C04B41/009C04B35/00
Inventor 董淑娟王轶辉曹学强蒋佳宁邓龙辉周鑫
Owner WUHAN UNIV OF TECH
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