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Metal-coated powder surface alloying method

A surface alloying and metal cladding technology, applied in the direction of coating, etc., to achieve good corrosion resistance, good thermal spraying performance, and avoid the effect of fine powder scattering

Inactive Publication Date: 2014-04-02
BEIJING GENERAL RES INST OF MINING & METALLURGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to address the lack of performance of existing metal-coated powders, provide a method for alloying metal-coated powders, and prepare alloy-coated composite powders, mainly for nickel-coated powders, cobalt-coated powders and other metals. Aluminum alloying of coated powders and alloying of metal elements such as chromium alloying

Method used

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  • Metal-coated powder surface alloying method

Examples

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Effect test

Embodiment 1

[0023] Take 100g of nickel-coated bentonite powder with a particle size of 45-150μm and a mass percentage of nickel of 65% and mix evenly with 10g of ultra-fine aluminum powder with a particle size of 2-10μm, and place the mixed powder in a high-temperature sintering furnace protected by high-purity hydrogen Carry out heat treatment, the heat treatment temperature is 900°C, and the heat treatment time is 2h. After heat treatment, cooling, crushing, and sieving, the morphology of the obtained nickel-aluminum-aluminum-coated bentonite powder is shown in the attached figure.

Embodiment 2

[0025] Take 100g of nickel-coated diatomite powder with a particle size of 45-200μm and a mass percentage of nickel of 70% and mix evenly with 10g of ultra-fine chromium powder with a particle size of 1-2μm, and place the mixed powder in a high-purity argon-protected Heat treatment is carried out in a high-temperature sintering furnace. The heat treatment temperature is 1200°C, and the heat treatment time is 2 hours. After heat treatment, it is cooled, crushed, and sieved.

Embodiment 3

[0027] Take 100g of nickel-coated graphite powder with a particle size of 45-200μm and a mass percentage of nickel of 75%, add 1wt% polyvinyl alcohol to mix and stir, and after the nickel-coated graphite powder is fully wetted, add 5g of nickel-coated graphite powder with a particle size of 30 The ~200nm ultra-fine aluminum powder is fully stirred, then dried to obtain agglomerated powder, and placed in a vacuum high-temperature sintering furnace for heat treatment. The heat treatment temperature is 600 ° C, and the heat treatment time is 72 hours. After heat treatment, it is cooled, crushed, and sieved.

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Abstract

The invention relates to a metal-coated powder surface alloying method, in particular to a method for preparing composite powder by alloying on the metal-coated powder surface. The method is characterized by including performing thermal treatment in vacuum or atmosphere protection environment after metal-coated powder and alloying powder are mechanically mixed or agglomerated and coated. The prepared powder is 45-200 micrometers in particle size, and mass percentage composition of alloying elements is 1-10%. The composite powder prepared by the method can be applied to the fields of aviation, spaceflight and the like, and serves as a thermal spraying material. The powder preparation technology is simple and easy to implement, and large-scale production can be realized.

Description

technical field [0001] The invention relates to a method for preparing composite powder for surface alloying of metal-coated powder, and belongs to the technical field of thermal spraying material preparation. The powder prepared by the above method is particularly suitable as a powder material for thermal spraying, and can be widely used in the fields of aviation, aerospace, automobiles, machinery, ships and the like. At the same time, the above method is also applicable to the alloying preparation of any other coated powders with similar structures. Background technique [0002] In order to meet the needs of different uses of coatings, powder materials for thermal spraying have been greatly improved in composition, structure, and performance in recent years, and the preparation methods are also continuously improved. In order to make the coating have properties such as oxidation resistance, corrosion resistance, and wear resistance at the same time, thermal spraying often...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02
Inventor 于月光冀晓鹃章德铭沈婕杨永琦刘建明
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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