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Aluminum-silicon-boron nitride sealed composite powder material, coating and preparation of powder material

A technology of aluminum silicon boron nitride and composite powder, which is applied in metal material coating process, coating, fusion spraying, etc., can solve the problems of easy burning and scattering, low coating, large difference in particle size and specific gravity, etc. Achieve the effects of excellent wearability and thermal stability, good spraying adaptability and high bonding strength

Active Publication Date: 2014-05-07
BEIJING GENERAL RES INST OF MINING & METALLURGY
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Problems solved by technology

This is mainly reflected in: the particle size of the boron nitride powder used in the existing aluminum-based boron nitride powder is relatively small (less than 10 μm), it is easy to burn and scatter during spraying, the abradable components in the coating are low, and the hardness is low. High; there are many types of raw material powders, large differences in particle size and specific gravity, uneven composition of the composite powder after agglomeration and compounding, insufficient adaptability of the spraying process, uneven coating structure, and insufficient bonding performance inside the coating and between the coating and the substrate , easy to produce local block drop and other phenomena

Method used

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  • Aluminum-silicon-boron nitride sealed composite powder material, coating and preparation of powder material
  • Aluminum-silicon-boron nitride sealed composite powder material, coating and preparation of powder material
  • Aluminum-silicon-boron nitride sealed composite powder material, coating and preparation of powder material

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preparation example Construction

[0023] The embodiment of the present invention also provides a method for preparing the above-mentioned aluminum silicon boron nitride sealing composite powder material, including:

[0024] Use aluminum-silicon alloy powder, hexagonal boron nitride powder and binder as raw materials;

[0025] Hexagonal boron nitride powder adopts: agglomerated hexagonal boron nitride powder made by agglomerating, sintering, and crushing hexagonal boron nitride ultrafine powder with a particle size of less than 10 μm;

[0026] Composite powder preparation: The aluminum-silicon alloy powder is uniformly reunited and coated on the surface of the hexagonal boron nitride powder through a binder to form a number of reunion-coated particles. The powder material composed of the reunion-coated particles is the aluminum-silicon-boron nitride sealant Composite powder material.

[0027] In the above method, because the hexagonal boron nitride powder is produced by the method of adhesive agglomeration-vac...

Embodiment

[0049] Take raw materials: Al: 87-89wt%, Si: 11-13wt%; put it into vacuum atomization equipment, use intermediate frequency induction heating, after the alloy liquid is homogenized, use argon atomization to obtain aluminum-silicon alloy powder;

[0050] The large-grain hexagonal boron nitride is prepared by the atmosphere-protected solid-phase sintering method, and the raw material used is 5-8 μm hexagonal boron nitride ultrafine powder; solid-phase sintering is a conventional powder metallurgy technology, the purpose is to make the material interparticle at high temperature Solid phase diffusion, here in order to obtain a dense boron nitride sintered body; the sintering process parameters are: temperature 2000-2300 ℃, sintering time 8-12h, sintering under vacuum or nitrogen protective atmosphere; adhesive agglomeration process should be used in advance before sintering The superfine boron nitride powder is agglomerated, and the binder used is alkyd varnish; after sintering, me...

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Abstract

The invention discloses an aluminum-silicon-boron nitride sealed composite powder material, a coating and a preparation method of the powder material, and belongs to the preparation field of thermal spraying materials. The composite powder material is composed of a plurality of agglomerated and coated particles, wherein each agglomerated and coated particle is used for forming a coating layer by taking boron nitride as a core and attaching aluminum-silicon alloy powder on the surface of the core; agglomerated and coated powder material comprises the following components in percentage by weight: 18-22% of BN (boron nitride), 7-9% of Si and the balance of Al. The aluminum-silicon-boron nitride sealed composite powder material is composed of the agglomerated and coated particles; each agglomerated and coated particle is used for forming coatings by taking the boron nitride as the core and attaching aluminum-silicon alloy powder on the surface of the core, so that the aluminum-silicon-boron nitride sealed composite powder material has the characteristics of uniform composites and good coating adaptability.

Description

technical field [0001] The invention relates to the field of preparation of thermal spraying materials, in particular to an agglomeration-coated aluminum-silicon-boron nitride-sealed composite powder material, a coating and a preparation method. Background technique [0002] With the development of aviation industry, higher and higher requirements are put forward for aero-engines. At present, the gas path sealing technology that reduces the gap between the compressor, turbine blade tip and casing has become the main method to improve engine performance. According to data reports, in a high-pressure turbine, for every 0.13-0.25mm gap reduction, the fuel consumption can be reduced by 0.5-1.0%, and the engine efficiency can be increased by about 2%. During the manufacture and operation of the engine, it is actually impossible to control the gap to zero, so a gap of 2 to 3 mm should be reserved between the blade tip and the case during the design and manufacture of the aero-eng...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/06B22F9/08C09D5/46
Inventor 于月光任先京章德铭刘建明沈婕程旭莹杨永琦张曙光刘通鲁秋源
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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