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Composite sealing coating, preparation method thereof, mechanical part and power device

A technology of sealing coating and surface layer, applied in the direction of coating, mechanical equipment, machine/engine, etc., can solve the problems of coating bonding strength and erosion resistance, and achieve both wearability and strength. Transfer amount, effect of reducing residual stress accumulation

Pending Publication Date: 2022-04-08
GUANGDONG INST OF NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And when the coating has too many pores, the bonding strength and erosion resistance of the coating will definitely decrease.

Method used

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  • Composite sealing coating, preparation method thereof, mechanical part and power device
  • Composite sealing coating, preparation method thereof, mechanical part and power device
  • Composite sealing coating, preparation method thereof, mechanical part and power device

Examples

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preparation example Construction

[0039] In the second aspect, an embodiment of the present invention provides a method for preparing a composite sealing coating, including:

[0040] S1, forming a metal bonding layer;

[0041] The metal bonding layer is formed by plasma spraying, wherein the conditions include: spraying power of 35-50KW; carrier gas flow rate of 2-5L / min; powder feeding rate of 20-40g / min; spray distance of 100-140mm.

[0042] It should be noted that (1) the metal bonding layer can be formed by using the prior art, and the plasma spraying provided by the embodiment of the present invention is only more effective, which is beneficial to the formation of the metal bonding layer and the combination of the metal bonding layer and the substrate, It is not limited to plasma spraying and the above conditions.

[0043] (2) Before forming the metal bonding layer on the substrate, it also includes performing pretreatment on the substrate. For example, after the substrate is degreased and degreased, th...

Embodiment 1

[0061] The present embodiment provides a kind of preparation method of composite sealing coating, it comprises the following steps:

[0062] (1) After degreasing the substrate, use fixtures or paste high-temperature tape to protect the non-sprayed area, sandblast the sprayed area to roughen it, and fix the sample to the front of the spray gun.

[0063] (2) After preheating the substrate with the atmospheric plasma spray jet under the condition of not feeding powder, spray NiCr powder to form a metal bonding layer, and the thickness of the obtained metal bonding layer is 0.12mm, wherein the spraying conditions include: spraying power is 42KW; The carrier gas flow rate is 4.5L / min; the powder feeding rate is 25g / min; the spray distance is 110mm.

[0064] (3) 2000 grams of fine aluminum powder, 1000 grams of flake hexagonal boron nitride, 1000 grams of dendritic electrolytic copper powder and 650 ml of water glass are premixed, bonded, sieved and dried to form agglomerated powder...

Embodiment 2

[0067] The present embodiment provides a kind of preparation method of composite sealing coating, it comprises the following steps:

[0068] (1) After degreasing the substrate, use fixtures or paste high-temperature tape to protect the non-sprayed area, sandblast the sprayed area to roughen it, and fix the sample to the front of the spray gun.

[0069] (2) After preheating the substrate with the atmospheric plasma spraying jet under the condition of not feeding powder, spray NiAl powder to form a metal bonding layer, and the thickness of the obtained metal bonding layer is 0.18mm, wherein the spraying conditions include: spraying power is 43KW; The carrier gas flow rate is 2.5L / min; the powder feeding rate is 30g / min; the spray distance is 110mm.

[0070] (3) 2200 grams of fine aluminum powder, 800 grams of flaky hexagonal boron nitride, 1000 grams of dendritic electrolytic copper powder and 700 ml of water glass were premixed, bonded, sieved and dried to form agglomerated pow...

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Abstract

The invention relates to the technical field of surface protection, in particular to a composite sealing coating and a preparation method thereof, a mechanical part and a power device. The composite sealing coating comprises a metal bonding layer and a copper-aluminum-boron nitride abradable surface layer which are connected in sequence, and the porosity of the copper-aluminum-boron nitride abradable surface layer is increased in the direction relatively away from the metal bonding layer. According to the composite sealing coating, accumulation of residual stress in the composite sealing coating is reduced, the abradability and strength of the composite sealing coating are both improved, and then the risk that the composite sealing coating falls off in the service process is reduced.

Description

technical field [0001] The invention relates to the technical field of surface protection, in particular to a composite sealing coating, a preparation method thereof, mechanical parts and a power device. Background technique [0002] The fan / compressor is an important part of the turbine engine. Its main function is to suck air into the engine and compress it to increase its pressure. During the operation of the engine, due to high-speed centrifugal force and thermal expansion, the blades of the engine are deformed and elongated, or the blades rotate eccentrically, causing the blades to scrape to the casing surface first. Studies have shown that when the relative gap between the tip of the working blade and the casing increases by 1%, the efficiency of the compressor will decrease by 1-3%. Excessive radial clearance will also cause the aerodynamic characteristics of the engine to be damaged during acceleration and cause surge. Therefore, it is necessary to control the gap ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/073C23C4/08C23C4/06C23C4/134F04D29/30
Inventor 杨焜闫希彦戴红亮曾克里牛少鹏宋进兵邓春明邓畅光刘敏周克崧
Owner GUANGDONG INST OF NEW MATERIALS
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