Composite powder for abradable seal coating and preparation method of coating

A sealing coating and composite powder technology, applied in the coating, metal material coating process, fusion spraying, etc., can solve the problems of cumbersome feeding operation, unstable bar quality, and harsh operating environment for workers, and achieve Good abrasion resistance, high bonding strength, and excellent thermal shock resistance

Inactive Publication Date: 2015-01-21
PLA NO 5719 FACTORY
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  • Abstract
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Problems solved by technology

Invention patent application number CN 200710150786.5 provides a multi-component rod seal coating material, but the quality of the rod itself is unstable, the feeding operation of the rod preparation and coating process is cumbersome, the operating environment for workers is harsh, and the rod cannot Meet the existing commonly used plasma spraying methods

Method used

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Embodiment Construction

[0011] Mix the multi-component composite powders by weight percentage, among them, graphite is 2.0%, hexagonal boron nitride is 17.0%, silicon dioxide is 6.0%, copper dioxide is 12.0%, cadmium dioxide is 4.0%, aluminum is 4.0%, nickel is the balance. Then adopt the method of granulation to make composite spraying powder. The sealing coating was made by plasma spraying, the process parameters of plasma spraying were current 550 A, hydrogen flow rate 10 L / min, argon flow rate 35 L / min, spraying distance 130 mm, powder feeding volume 15 g / min. The test shows that the surface Rockwell hardness HR15Y of the sprayed sealing coating is 50. The bonding strength of the sealing coating can reach 5 MPa; the thermal shock performance at 600°C is water-cooled for 50 times without cracking; at 600°C for 100 hours, the hardness does not change significantly after being taken out and naturally cooled to room temperature, which can be widely used in the preparation of materials below 600°C ...

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Abstract

The invention provides composite powder for an abradable seal coating and a preparation method of the coating. The composite powder consists of the following substances in percentage by weight: 1.5-2.5 percent of graphite, 15.0-20.0 percent of hexagonal boron nitride, 4.0-8.0 percent of silicon dioxide, 10.0-13.0 percent of copper dioxide, 3.0-5.0 percent of cadmium dioxide, 3.0-5.0 percent of aluminum and the balance of nickel. The method for preparing the abradable seal coating by utilizing the composite powder is a plasma spraying method, and the spraying parameters comprise the current of 500-600A, the hydrogen flow of 8-14L/min, the argon flow of 30-40L/min, the spraying distance of 100-150mm and the powder feeding amount of 10-20g/min. By utilizing the composite powder and the coating preparation method disclosed by the invention, the use temperature of the prepared seal coating can reach 600 DEG C.

Description

technical field [0001] The invention relates to a composite powder composition for an abradable sealing coating of an aero-engine compressor casing and a coating preparation method, belonging to the field of surface engineering. Background technique [0002] In order to improve engine efficiency and reduce fuel consumption, abradable sealing coatings are widely used in the field of air path sealing of aeroengines. Most of the abradable sealing coating materials at home and abroad are mostly powders composed of a certain proportion of metal phase and non-metal phase with lubricating effect. The metal phase plays the role of anti-corrosion, anti-oxidation, and ensuring the strength of the coating itself, and the non-metallic phase plays the role of wearability and anti-adhesion. [0003] The sealing coating powder materials used in the prior art mainly include: aluminum alloy / polymer coating is mixed with high-temperature polymer (polyester) and AlSi powder, processed by plas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/04C23C4/12C23C4/067C23C4/134
CPCC23C4/06
Inventor 向巧郭双全何勇黄选民付俊波
Owner PLA NO 5719 FACTORY
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