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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 is often required before spraying to promote the precipitation of graphite in the powder, thus increasing the complexity of the process, and spraying The higher energy in the process inevitably causes the burning of graphite (Y. Tsunekawa, et al. Journal of Thermal Spray Technology, 2006, 15(2): 239)
In addition, the wear damage of these two spray coatings is still relatively serious due to their poor corrosion resistance in acidic environments.

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

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Embodiment 1

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

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

[0031] (1) Machining and roughening the surface of the aluminum alloy substrate to form dovetail grooves with a width of 150 μm and a depth of about 100 μm are evenly distributed on the surface of the substrate, and then ultrasonic cleaning in acetone and ethanol for 20 minutes;

[0032] (2) According to the weight formula: 17.84% chromium, 8.45% nickel, 0.83% carbon, 3.12% silicon, 0.96% manganese, and the balance is iron to prepare chromium-iron-based alloy; then melt the alloy and p...

Embodiment 2

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

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

[0042] (1) The surface of the aluminum alloy substrate is roughened by sandblasting, and then ultrasonically cleaned in acetone and ethanol for 15 minutes;

[0043] (2) According to the weight formula: 17.84% chromium, 8.45% nickel, 0.83% carbon, 3.12% silicon, 0.96% manganese, and the balance is iron to prepare a chromium-iron-based alloy; then melt the alloy and prepare it by gas atomization The chromium-iron-based alloy powder, so that the particle size of the chromium-iron-based alloy powder is -32...

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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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