High temperature oxidation of TiAl/SiCp composites manufactured by MA-SPS process

被引：28

作者：

Lee, DB ^{[1
]}

Park, JH ^{[1
]}

Park, YH ^{[1
]}

Kim, YJ ^{[1
]}

机构：

[1] TOHOKU NATL IND RES INST, SENDAI, MIYAGI 983, JAPAN

来源：

MATERIALS TRANSACTIONS JIM | 1997年 / 38卷 / 04期

关键词：

oxidation; TiAl intermetallics; composite; mechanical alloying; spark plasma sintering; dispersed particle; silicon carbide;

D O I：

10.2320/matertrans1989.38.306

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The oxidation behavior of TiAl-containing dispersed particles of (5, 10, 15 mass%) SiC has been studied between 1273 and 1473 K in air. The SiC additions decreased the oxidation rate and exhibited a most pronounced effect for TiAl-10 and 15 mass%SiC composites. The effect of SiC particles is mainly twofold. Firstly, some of the SiC particles reacted with Ti to form Ti-Si compounds, resulting in a decrease in the activity of Ti and, consequently, an increase in the activity of Al in bulk composites. Hence, a thin protective scale mainly composed of a single layer of alpha-Al2O3 was formed on TiAl/SiCp, contrary to other SiC-free TiAl alloys where relatively thick oxides having multiple layers of TiO2 and alpha-Al2O3 formed. Secondly, finely distributed unreacted SiC particles promoted fine-grained oxide layer formation by acting as nucleation sites. This increase in nucleation allowed a more rapid formation of alpha-Al2O3 and, lowered the total weight gain. The new alloy system of TiAl/SiCp composites is considered to be one of the most oxidation-resistant TiAl alloys developed.

引用

页码：306 / 311

页数：6

共 24 条

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