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Conductive abradable seal coating material and preparation method thereof

A technology of sealing coatings and conductive fillers, which is applied in the direction of conductive coatings and coatings, can solve the problems that cannot meet the requirements of EDM, do not have conductivity, and the coating is easy to crack, so as to improve the scratch performance and conductivity Excellent performance, low cost, and less damage to the coating

Pending Publication Date: 2022-05-13
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the abradable sealing coating is a kind of ceramic coating, which is brittle and has a high melting point, the traditional digital milling process of the abradable sealing coating has the problem that the coating is easy to crack and peel off, and the laser method can be processed. Abrasive sealing coating has the problems of high cost and long processing cycle
EDM is to remove the workpiece material by melting and vaporizing it through electric discharge. It is not affected by the mechanical properties of the workpiece such as brittleness, cohesive strength and toughness. It can be used for processing difficult-to-cut materials. EDM requires the material itself to have certain Conductivity, the current abradable sealing coating system is all rare earth oxides, which do not have conductivity and cannot meet the requirements of EDM

Method used

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  • Conductive abradable seal coating material and preparation method thereof
  • Conductive abradable seal coating material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0045] Typical turbine outer ring components, the matrix material is infiltrated SiCf / SiC composite material. Use acetone to ultrasonically clean the surface of the components, dry the surface with compressed air, and put it into a resistance furnace for drying.

[0046] The machined surface is sandblasted with SiC sand grains with multi-water chestnut structure. The SiC sand grain size is 100 mesh, the working gas pressure is 0.3MPa, and the surface roughness after sandblasting is Ra3.2μm.

[0047] The silicon layer is sprayed on the surface of the component by vacuum plasma technology, with argon and hydrogen as the working gas, the control spray gun power is 40kW, the flow rate of argon gas is 55L / min, the flow rate of hydrogen gas is 10L / min, the spraying distance is 300mm, and the pressure of the vacuum chamber is 200Pa. After spraying, the thickness of the coating is 0.06mm, the bonding strength of the coating is 26MPa, the porosity of the coating is 0.8%, and the oxygen...

Embodiment 2

[0059] Typical turbine outer ring components, the matrix material is SiCf / SiC composite material of CVI process. Use acetone to ultrasonically clean the surface of the components, dry the surface with compressed air, and put it into a resistance furnace for drying.

[0060] The abradable sealing surface layer powder material is composed of lutetium silicate, molybdenum, molybdenum silicide and polyester, wherein the weight percentage is: dilute lutetium silicate 65%, nanometer molybdenum 25%, molybdenum silicide 2.0%, polyester: 8.0%. The preparation process of the abradable sealing surface layer powder material specifically includes the following steps:

[0061] Slurry preparation: mix lutetium silicate powder with a particle size of 2 μm, pure molybdenum powder with a particle size of 100 nm, and molybdenum silicide powder with a particle size of 1 μm in proportion, add deionized water for ball milling according to the powder volume content of 30%, and add the total weight...

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Abstract

The invention belongs to the field of inorganic non-metallic materials, and particularly relates to a conductive abradable seal coating material and a preparation method thereof. The conductive abradable seal coating material comprises the following components in percentage by weight: 60 to 70 percent of rare earth silicate, 20 to 30 percent of conductive filler, 2.0 percent of lubricating phase and 8.0 percent of polyester. A powder material is prepared by adopting a solid-phase sintering and mechanical mixing method, a conductive abradable sealing coating is prepared by utilizing a plasma spraying process, and the surface configuration is processed by electric spark. The abradable seal coating material has the advantages of being good in interface matching performance with a ceramic matrix composite matrix, high in water and oxygen resistance, good in conductivity and the like, the surface of the coating is subjected to structural modeling through an electric spark technology, and the scraping matching performance of the abradable seal coating and a rotor material can be effectively improved.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, and in particular relates to a conductive and abradable sealing coating material and a preparation method thereof. Background technique [0002] Silicon carbide ceramic matrix composites have the advantages of low density, high specific strength, high temperature resistance, oxidation resistance, and high toughness, and are expected to replace traditional Ni-based alloys or single crystal Ni-based alloys as structural materials for aeroengine turbine outer ring components. However, the outer ring parts of the turbine made of silicon carbide ceramic matrix composites are easily scratched, scratched and adhered by the rotor parts under high-temperature and high-speed environments, resulting in a sharp decline in the mechanical properties of the composite materials. Composite matrix for protection. [0003] Common abradable sealing coatings include two systems of silicon / mullite / bari...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D1/00C09D5/24C09D7/65C09D7/61
CPCC09D1/00C09D5/24C09D7/65C09D7/61
Inventor 崔永静王长亮焦健郭梦秋宇波
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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