Characteristics of Low Pressure Plasma Sprayed Alumina Coating

被引：2

作者：

Deng Chun-Ming ^{[1
]}

Zhou Ke-Song ^{[1
]}

Liu Min ^{[1
]}

Deng Chang-Guang ^{[1
]}

Song Jin-Bing ^{[1
]}

Zheng Zhi-Gang ^{[1
]}

机构：

[1] Guangzhou Res Inst Nonferrous Met, Guangzhou 510651, Guangdong, Peoples R China

来源：

JOURNAL OF INORGANIC MATERIALS | 2009年 / 24卷 / 01期

关键词：

low pressure plasma spray; alumina coating; characteristics; CORROSION BEHAVIOR; FILMS;

D O I：

10.3724/SP.J.1077.2009.00117

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

LPPS (Low Pressure Plasma Spray) alumina coatings with deposition efficiency higher than 50% and porosity lower than 2% were elaborated using fine alumina powder as feedstock. Characteristics of alumina coatings prepared with different LPPS parameters, including deposition efficiency, phase composition and microstructure, were investigated. The effects of plasma power and chamber pressure on the LPPS alumina coatings were also studied. The results demonstrate that LPPS alumina coating consists of alpha-Al2O3, and gamma-Al2O3 phase. The porosity is evidently decreased with the increase of power and chamber pressure, but plasma power has insignificant influence on the porosity when the chamber pressure is as high as 23.7kPa. The particle temperature and velocity in plasma plume are obtained on the basis of empirical formula, which reveals that particles with high velocity in plasma plume are completely molten when the pressure is 23.7kPa.

引用

页码：117 / 121

页数：5

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