The effect of particle size of alumina dispersions on the oxidation resistance of Ni-Cr alloys

被引：9
|
作者：
Lim, HJ
Park, SW
Kang, SG
机构：
[1] Hanyang Univ, Dept Mat & Met Engn, Seoul 133791, South Korea
[2] Korea Inst Sci & Technol, Div Ceram, Seoul 130650, South Korea
来源：
OXIDATION OF METALS | 1997年 / 48卷 / 5-6期
关键词：
high-temperature oxidation; Ni-Cr alloy; oxidation rate; protective Cr2O3 layer; Al2O3; dispersion; selective oxidation;
D O I：
10.1007/BF02153458
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The oxidation behavior of Ni-Cr alloys with various chromium concentrations and particle sizes of a dispersion of 10 vol.% Al2O3 was observed in 1 atm of oxygen at 1000 degrees C, This study was intended to determine the critical chromium concentration to form a protective Cr2O3 oxide layer for different Al2O3 particle sizes. The oxidation rate of Ni-Cr alloys containing 10 vol.% Al2O3 followed a parabolic rate law and a Cr2O3 protective layer continuously formed when the oxidation rate decreased rapidly. Times to form a continuous and protective Cr2O3 layer during the initial oxidation shortened as the size of the dispersion decreased The critical chromium concentration to form a protective Cr2O3 layer in the oxide scale was 6 similar to 9 wt.% and was related strongly to the particle size of the Al2O3 dispersion.
引用
收藏
页码：391 / 415
页数：25
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