Plasma spray coating on aluminum alloy base surface and preparation method thereof

A kind of aluminum alloy and plasma technology, applied in the direction of metal material coating process, coating, molten spraying, etc., can solve the problems of increasing process complexity, poor corrosion resistance, serious wear and damage, etc., achieve smooth shape, avoid Effect of over-oxidation, moderate pore size

Inactive Publication Date: 2014-03-19
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For low-alloy carbon steel, iron oxides will be formed during the plasma spraying process, which has self-lubricating properties, but if the process parameters are not properly controlled, excessive oxides will be produced, which will adversely affect the coating performance. The hardness of this coating is low; for cast iron, it contains graphite itself, which can play a certain self-lubricating effect, but a special heat treatment process i

Method used

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  • Plasma spray coating on aluminum alloy base surface and preparation method thereof
  • Plasma spray coating on aluminum alloy base surface and preparation method thereof
  • Plasma spray coating on aluminum alloy base surface and preparation method thereof

Examples

Experimental program
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Example Embodiment

[0028] Example 1:

[0029] In this embodiment, the aluminum alloy substrate is an engine cylinder, and the inner wall surface of the cylinder is a plasma sprayed coating. The composition and content of the coating are as follows: chromium 17.84%, nickel 8.45%, and carbon 0.83%. Silicon 3.12%, manganese 0.96%, the balance is iron; and the austenite microstructure of the coating microstructure is dispersed with Cr 7 C 3 Strengthen the phase.

[0030] The preparation method of the coating is as follows:

[0031] (1) Machining and roughening the surface of the aluminum alloy substrate to form a dovetail groove with a width of 150 μm and a depth of about 100 μm is uniformly distributed on the surface of the substrate, and then ultrasonically cleaned in acetone and ethanol for 20 minutes;

[0032] (2) Formulated by weight: chromium 17.84%, nickel 8.45%, carbon 0.83%, silicon 3.12%, manganese 0.96%, the balance is iron, and the chromium-iron-based alloy is prepared; then the alloy is melted,...

Example Embodiment

[0039] Example 2:

[0040] In this embodiment, the aluminum alloy substrate is an engine cylinder, and the inner wall surface of the cylinder is a plasma sprayed coating. The composition and content of the coating are as follows: chromium 17.84%, nickel 8.45%, and carbon 0.83%. Silicon 3.12%, manganese 0.96%, and the balance is iron; and the microstructure of the coating is based on austenite, in which Cr is dispersed 7 C 3 Strengthen the phase.

[0041] The preparation method of the coating is as follows:

[0042] (1) Perform sandblasting and roughening treatment on the surface of the aluminum alloy substrate, and then ultrasonically clean it in acetone and ethanol for 15 minutes;

[0043] (2) Formulated by weight: chromium 17.84%, nickel 8.45%, carbon 0.83%, silicon 3.12%, manganese 0.96%, and the balance is iron, to prepare a chromium iron-based alloy; then the alloy is melted and prepared by a gas atomization method Ferrochrome-based alloy powder, so that the particle size of the...

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Abstract

The invention provides a plasma spray coating on an aluminum alloy base surface, which is composed of the following components in percentage by weight: 14-25% of chromium, 6-15% of nickel, 0.5-1.5% of carbon, 2.0-4.0% of silicon, 0.8-1.5% of manganese and the balance of iron. A Cr7C3 strengthening phase is dispersed in the austenite microstructure of the coating. The experiment proves that the coating has favorable wear resistance and antiseptic property, and is suitable for an aluminum alloy base surface working in a wearing and corrosive environment, such as an automobile engine cylinder made of an aluminum alloy material.

Description

technical field [0001] The invention relates to the technical field of protective treatment on the surface of an aluminum alloy substrate, in particular to a plasma spray coating on the surface of an aluminum alloy substrate and a preparation method thereof. Background technique [0002] Aluminum alloy materials are widely used due to their advantages such as wide source, light weight and good thermal conductivity. But on the other hand, aluminum alloys have poor friction and corrosion resistance, so aluminum alloy workpieces under friction and corrosion conditions need to undergo certain protective treatments. [0003] For example, the application of aluminum alloy engine greatly reduces the weight of the vehicle, which not only helps to improve the power performance of the vehicle, but also is an important way for the modern automobile industry to save energy and reduce emissions. However, the tribological properties of aluminum alloy engine cylinders are very poor. In ad...

Claims

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Application Information

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IPC IPC(8): C23C4/10C23C4/12C22C38/40C22C38/04C23C4/134
Inventor 王永欣王宾薛群基李金龙曾志翔
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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