High Temperature Material Processes (An International Quarterly of High-Technology Plasma Processes) An International Journal

ISSN for PRINT: 1093-3611

For Online Access

Best Paper Award Selection - Editorial Board Site

2005, Volume9

Issue 4

174 pages

DOI: 10.1615/HighTempMatProc.v9.i4

Issue price - $144.00

Shi-wei Yang
School of Material Science and Engineering, Harbin Engineering University, Harbin 150001, China

Fan-yun Zhang
ShenYang LiMing Aero Engine Limited. Shenyang 110043, China

Li Li
School of Material Science and Engineering, Harbin Engineering University, Harbin 150001, China

Jin Lou
School of Material Science and Engineering, Harbin Engineering University, Harbin 150001, China

To increase the time of efficacy of aero engines, the technology of protective coatings is widely used on the aero engine turbine, in order to improve the high temperature oxidation resistance of alloys. This study uses hot diffusion to form Al-Si coating on superalloy K438. According to GB/T13303-91(The Standard of The Public of China: Steels Detemination Method of Oxidation Resistance), high temperature oxidation experiments of Al-Si coating on superalloy K438 were carried out at 1000 °C for 50hr. The surface morphology was studied by using SEM (XL-300FEG).It is concluded that in the process of high temperature oxidation, the Al-Si coating on superalloy K438 has formed continuous and compact oxide scale α-Al₂O₃ ,which would prevent oxygen permeating to the alloy substrate. This oxide scale α-Al₂O₃ has no cracks and did not peeled off. The addition of Si to the coating can effectively prevent diffusion between elements of substrate and those of coating. It acts as a diffusion barrier, prolongs the deterioration period of coating and provides excellent high temperature oxidation resistance.

DOI: 10.1615/HighTempMatProc.v9.i4.110 Download article, 619-624 pages

Article price - $35.00

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