Oxidation resistance of powder compacts of the Nb-Si-Cr system and Nb3Si5Al2 matrix compacts prepared by spark plasma sintering

被引：51

作者：

Murakami, T ^{[1
]}

Sasaki, S

Ichikawa, K

Kitahara, A

机构：

[1] Natl Inst Adv Ind Sci & Technol, Inst Mech Syst Engn, Tsukuba, Ibaraki 3058564, Japan

[2] AIST, Saga 8410052, Japan

来源：

INTERMETALLICS | 2001年 / 9卷 / 07期

关键词：

silicides; various; ternary alloy systems; mechanical properties at high temperatures; oxidation; sintering;

D O I：

10.1016/S0966-9795(01)00043-7

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 [物理化学]; 081704 [应用化学];

摘要：

Powder compacts with several different compositions of the Nb-Si-Cr system and Nb3Al2Si5 matrix compacts with a composition of Nb-47Si=20Al (at.%) were prepared by spark plasma sintering. The microstructure, oxidation behavior and mechanical and physical properties of each compact were investigated. Adding more than 10 at.% Cr to NbSi2 compacts greatly improved their poor oxidation resistance at 1023 K. However, the oxidation resistance of such Cr-added compacts was poor at 1573 K because of volatilization of Cr oxide formed on their surface and fast growth of the oxidized layer. Nb3Si5Al2 matrix compacts with a composition of Nb-47Si-20Al showed extremely good oxidation resistance at 1373-1573 K because thin protective Al2O3 scale was formed. Nb3Si5Al2 matrix compacts partially melted at temperatures between 1873 and 1973 K. Nb3Si5Al2 single-phase ingots were not obtained by arc melting. (C) 2001 Elsevier Science Ltd. All rights reserved.

引用

页码：629 / 635

页数：7

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