Rare-earth-based T/EBC ceramic matrix composite environmental barrier coating and preparation method thereof

A ceramic matrix composite, environmental barrier technology, applied in the direction of mechanical equipment, machine/engine, blade supporting elements, etc., can solve the problems of low maximum tolerance temperature, insufficient high temperature erosion resistance, etc., to reduce thermal conductivity, Improve the effect of high temperature resistance and compact structure

Active Publication Date: 2017-08-11
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current EBC still generally has the problems of insufficient high-temperature erosion resistance and low maximum tolerance temperature.

Method used

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  • Rare-earth-based T/EBC ceramic matrix composite environmental barrier coating and preparation method thereof
  • Rare-earth-based T/EBC ceramic matrix composite environmental barrier coating and preparation method thereof
  • Rare-earth-based T/EBC ceramic matrix composite environmental barrier coating and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0034] This embodiment provides a ceramic-based composite environmental barrier coating, which includes a ceramic substrate and a composite environmental barrier coating. The composite environmental barrier coating sequentially includes a water-oxygen corrosion-resistant layer, a chemical barrier layer, an energy dissipation layer, and The heat protection shielding layer and the water and oxygen corrosion resistant layer are prepared on the surface of the ceramic substrate; the material of the ceramic substrate is silicon carbide fiber reinforced silicon carbide ceramic matrix composite material; the water and oxygen corrosion resistant layer includes a mullite layer with a thickness of 50 μm and a thickness of 70 μm lutetium silicate layer, the material of the mullite layer includes mullite, the material of the lutetium silicate layer includes lutetium silicate; the material of the chemical barrier layer includes zirconium nitride, the thickness is 7 μm, and the porosity is les...

Embodiment 2

[0042] This embodiment provides a ceramic-based composite environmental barrier coating, which includes a ceramic substrate and a composite environmental barrier coating. The composite environmental barrier coating sequentially includes a water-oxygen corrosion-resistant layer, a chemical barrier layer, an energy dissipation layer, and Thermal protection shielding layer; the material of the ceramic substrate is silicon carbide fiber reinforced silicon carbide ceramic matrix composite material, and the water and oxygen corrosion resistant layer is prepared on the surface of the ceramic substrate; the water and oxygen corrosion resistant layer includes a mullite layer with a thickness of 58 μm and a thickness of 65 μm lutetium silicate layer, the material of the mullite layer includes mullite, the material of the lutetium silicate layer includes lutetium silicate; the material of the chemical barrier layer includes zirconium nitride, the thickness is 9 μm, and the porosity is less...

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Abstract

The invention relates to a rare-earth-based T / EBC ceramic matrix composite environmental barrier coating and a preparation method thereof. A ceramic matrix is made of a silicon carbide fiber reinforcement silicon carbide ceramic matrix composite material, the environmental barrier coating sequentially comprises a water oxygen corrosion resistant layer, a chemical barrier layer, an energy dissipation layer and a thermal protecting and shielding layer from inside to outside, and the water oxygen corrosion resistant layer is prepared on the surface of the ceramic matrix, wherein materials of the water oxygen corrosion resistant layer comprise mullite and lutetium orthosilicate; a material of the chemical barrier layer comprises zirconium nitride; a material of the energy dissipation layer comprises yttrium aluminum garnet; a material of the thermal protecting and shielding layer comprises lanthanum zirconate. The ceramic matrix composite environmental barrier coating has excellent comprehensive performance, the interfacial strength, fracture toughness and hardness of the coating can be improved, the service life of the coating is significantly prolonged, the thermal conductivity of the coating is reduced, and therefore the Sicf / Sic ceramic matrix can keep stable in comprehensive performance after recycling utilization for multiple circles under the high-temperature environment of 1900 k or above.

Description

technical field [0001] The invention relates to the technical field of preparation of environmental barrier coatings, in particular to a long-life, low-thermal conductivity rare-earth T / EBC ceramic-based composite environmental barrier coating and a preparation method thereof. Background technique [0002] Improving the ultra-high temperature resistance of key hot-end component materials of aero-engines such as turbine blades, heat shields, and tail nozzles is an important prerequisite for the development of advanced aero-engines with high thrust-to-weight ratio, high thrust, and low fuel consumption. At present, the hot end components of a certain type of aero-engine in my country are basically superalloy materials. The maximum allowable temperature of this type of material is only about 1130°C, and its high density has severely limited its application in reliable high-temperature structural materials. It is difficult to continue to adapt to the mission requirements of high-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/89C04B35/565F01D5/28
CPCC04B41/009C04B41/52C04B41/89F01D5/284F05D2300/6033C04B35/565C04B41/4527C04B41/5024C04B41/5062C04B41/5032C04B41/4582C04B41/5042
Inventor 罗瑞盈全华锋
Owner BEIHANG UNIV
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