High-temperature alloy surface nanometer composite coating and preparation method thereof

A nano-composite coating and high-temperature alloy technology, which is applied in metal material coating technology, coating, fusion spraying, etc., can solve the problems of poor bonding, low coating toughness, pesting phenomenon, etc., and achieve simple process and environmental protection The effect of less pollution and excellent high temperature oxidation resistance

Inactive Publication Date: 2012-12-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention is aimed at pure MoSi 2 The coating has problems such as low toughness, poor bonding with the substrate, and prone to "pesting" phenomenon during low-temperature oxidation. A nano-MoSi coating on the surface of a superalloy is provided. 2 -Preparation method of CoNiCrAlY composite coating: This preparation method is simple in process, easy to control, has little environmental pollution, and does not need to spray a transition layer between the substrate and the coating

Method used

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  • High-temperature alloy surface nanometer composite coating and preparation method thereof
  • High-temperature alloy surface nanometer composite coating and preparation method thereof
  • High-temperature alloy surface nanometer composite coating and preparation method thereof

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Embodiment 1

[0043] (1) Preparation and cleaning of the base material: GH4169 nickel-based alloy was selected as the base material, and after the base material was cut into square sheets, the base material was ultrasonically cleaned with acetone and deionized water for 15 minutes, and then the base material was wiped with filter paper. The surface of the material is air-dried for later use;

[0044] (2) Sand blasting treatment: use corundum sand with a particle size of 500-700 μm to perform sand blasting roughening treatment on the surface of the substrate treated in step (1), the sand blasting pressure is 0.20MPa, the sand blasting angle is about 70°, The time is 20s;

[0045] (3) Preheating treatment: Preheat the substrate treated in step (2) to 150°C by using plasma jet flame;

[0046] (4) Plasma spraying: Nano-MoSi successfully prepared in the previous period 2 - CoNiCrAlY composite structure particles are fed as spray powder, and the substrate treated in step (3) is plasma sprayed. ...

Embodiment 2

[0053] The difference between this embodiment and embodiment 1 is that the spraying distance in step (4) is 100 mm, and the powder feeding amount is 5 g / min.

Embodiment 3

[0055] The differences between this embodiment and embodiment 1 are: the spraying distance in step (4) is 100 mm, and the powder feeding rate is 10 g / min.

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Abstract

The invention discloses a high-temperature alloy surface nanometer composite coating and a preparation method of the high-temperature alloy surface nanometer composite coating. The high-temperature alloy surface nanometer composite coating specifically comprises the following steps of: (1) ultrasonically washing an alloy substrate through acetone and deionized water in sequence; wiping the substrate through a filtering paper after the washing, and drying in the air for stand-by use; (2) carrying out sand blasting on the substrate processed in step (1) through emery; (3) preheating the substrate processed in step (2) through plasma bright eruption; (4) coating the substrate processed in step (3) through a plasma coating method, wherein the powder for coating is the nanometer MoSi2-CoNiCrAlY composite structure particle feedstock obtained by high-energy ball milling and sieving; and (5) naturally cooling the coated sample. With adoption of the method, the surface of a base body can be directly coated, and the prepared coating can effectively solve the problems that the pure MoSi2 coating has the defects of low toughness, poor combining performance to the base body, and easily-occured low-temperature 'pesting' phenomenon.

Description

technical field [0001] The invention belongs to the field of metal-based ceramic composite materials, in particular to a nanometer MoSi on the surface of a superalloy 2 - Preparation method of CoNiCrAlY composite coating. Background technique [0002] Superalloys refer to a class of metal materials based on iron, cobalt, and nickel, and can work for a long time at high temperatures above 600°C and under certain stresses. They are mainly used in aerospace, aviation, petroleum, chemical industry, ships, etc. field. However, due to the limitations of its own properties, the working temperature of superalloys has been difficult to meet the rapid development of today's scientific and technological progress. For example, when the temperature exceeds 1000 ° C, the high-temperature oxidation resistance of nickel-based alloys will be significantly reduced, resulting in its high-temperature mechanical properties. decline. Therefore, the method of applying a protective coating on th...

Claims

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Application Information

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IPC IPC(8): C23C4/06C23C4/073C23C4/134
Inventor 钟喜春刘名涛曾德长刘仲武邱万奇余红雅李尚周
Owner SOUTH CHINA UNIV OF TECH
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