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Method for plasma spraying of wearable coating for aluminium alloy matrix surface

A wear-resistant coating, aluminum alloy technology, applied in metal material coating process, coating, melt spraying and other directions, can solve the problems of low bonding strength between coating and substrate, complex quality control of plasma coating, etc.

Inactive Publication Date: 2006-10-11
HOHAI UNIV
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AI Technical Summary

Problems solved by technology

However, the quality control of plasma coating is complicated, and the bonding strength between coating and substrate is low

Method used

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  • Method for plasma spraying of wearable coating for aluminium alloy matrix surface

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Embodiment Construction

[0031] A method for plasma spraying a wear-resistant coating on an aluminum alloy substrate, the method steps are as follows:

[0032] 1. The workpiece (1) to be sprayed is subjected to surface sandblasting to remove the oxide film and increase the surface roughness. The workpiece (1) is a cylinder of 25.4mm×30mm, the material is ZL104, and the sand used for sandblasting is 30-50 Purpose white corundum sand;

[0033] 2. The powder NiCrAlCo-Y to be sprayed and bonded 2 o 3 and working layer powder Al 2 o 3 -45TiO 2 Bake at 70°C for 3 hours to ensure powder dryness, NiCrAlCo-Y 2 o 3 To bond the bottom layer, the particle size is -140~+320; Al 2 o 3 -45TiO 2 As the working layer, the particle size is -45μm~+5μm; the dried NiCrAlCo-Y 2 o 3 Powder and Al 2 o 3 -45TiO 2 The powder is loaded into the powder feeder (10) respectively;

[0034] 3. Place the workpiece (1) to be sprayed on the working platform (2);

[0035] 4. Cover the workpiece (1) with a semi-closed co...

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Abstract

This invention provides a plasma spray wear-resisting coating method for the aluminum alloy base surface, which has the following steps: doing surface preprocessing with the spray work piece (1), installing the work piece (1) on the movable workbench (2), covering the work piece (1) with semi closed cover (3); drying the spray-waiting powder and loading it to the powder delivering machine (10); setting plasma spray technology parameter, opening inert gas valve (7), filling inert gas in semi closed cover (3), lighting spray gun (8), after the spray felt bottom reaches regulated thickness, stopping filling inert gas and opening spray gun; wherein changing powder or switching powder delivering machine (10), lighting spray gun (8), spraying working layer can use condensation air to cool spray work piece (1). This invention improves the joining intension of the coating layer and base greatly by using inert gas, wherein the joining intension is more than 30MPa, which reaches the level of the joining intension of the steel surface plasma spray coating and base.

Description

1. Technical field [0001] The invention mainly relates to the field of surface coating of light alloy materials, in particular to a method for plasma spraying wear-resistant coating on the surface of aluminum alloy. 2. Background technology [0002] The energy consumption of vehicles and ships is huge, and the exhaust gas (mainly toxic nitrogen compounds and carbides) discharged at the same time is very serious to human survival and environmental damage. High speed, energy saving, safety, comfort, and environmental protection are the themes of the transportation industry, and lightweight is the most effective way to achieve these goals. In addition to designing the structure and adopting new technologies for lightweight, the main countermeasure is the selection of light alloy materials. Aluminum alloy has low density and is one of the most commonly used light alloys. However, aluminum alloy has low hardness and poor wear resistance. Aiming at this shortcoming of aluminum a...

Claims

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Application Information

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IPC IPC(8): C23C4/02C23C4/06C23C4/11C23C4/134
Inventor 王泽华方学锋刘滕彬林萍华
Owner HOHAI UNIV
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