Agglomerated copper-aluminum-nickel-graphite sealed composite powder material and preparation method thereof

Abstract

The invention provides an agglomeration type copper aluminum nickel graphite sealing composite powder material. The material comprises, by weight, 45-76% of copper, 1.5-8% of aluminum, 10-37.5 % of nickel, smaller than or equal to 1.6% of ferrum, and the balance of carbon. A preparation method includes the following steps that firstly, a copper aluminum alloy powder intermediate material is prepared, then a nickel-coated graphite powder intermediate material is prepared, and finally the copper aluminum nickel graphite sealing composite powder material can be prepared through the copper aluminum alloy powder intermediate material and the nickel-coated graphite powder intermediate material in an agglomeration bonding process. The agglomeration type copper aluminum nickel graphite sealing composite powder material prepared through the preparation method has the advantages of being even in constituent and good in spraying adaptability; an agglomeration type copper aluminum nickel graphite coating prepared through a flame spraying process is higher in combined strength, abrasion-resistant and more excellent in thermal stability, a good sealing effect can be achieved when the agglomeration type copper aluminum nickel graphite coating is applied to a compressor component of an engine, and the working temperature of the coating is smaller than 550 DEG C.

Description

technical field [0001] The invention relates to the technical field of an abradable gap control coating for thermal spraying and its material preparation, in particular to an agglomerated abradable sealing composite powder material whose application temperature of the coating can reach up to 550°C and a preparation method thereof. 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 operation and operation of the engine, it is actually impossible to control the gap to zero. Therefore, a gap of 2 to 3 mm should be ...

AI Technical Summary

Problems solved by technology

This is mainly reflected in: the nickel-coated graphite powder used in the original copper-aluminum-nickel graphite powder has low graphite content, incomplete coating, low abradable components, and high hardness. The copper-aluminum composite powder ultrafine aluminum powder used High surface activity, high powder oxide impurity content, insufficient bonding performance inside the coating and between the coating and the substrate, prepared by simple mechanical mixing method, uneven powder composition, insufficient adaptability of spraying process, uneven coating structure, It is easy to produce local block loss and other phenomena

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