IMPROVEMENT IN THE OXIDATION RESISTANCE OF TIAL BY PREOXIDATION IN A SIO2-POWDER PACK

被引：49

作者：

TANIGUCHI, S

SHIBATA, T

MURAKAMI, A

机构：

[1] Department of Materials Science and Processing, Faculty of Engineering, Osaka University, Suita, Osaka, 565

[2] Department of Materials Science and Processing, Faculty of Engineering, Osaka University, Osaka

来源：

OXIDATION OF METALS | 1994年 / 41卷 / 1-2期

关键词：

OXIDATION RESISTANCE; TIAL; HIGH TEMPERATURE; PREOXIDATION; SILICA POWDER; PACK TREATMENT; LOW-OXYGEN PRESSURE;

D O I：

10.1007/BF01196645

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The resistance of TiAl coupons to cyclic oxidation at 1300 K in a flow of purified oxygen under atmospheric pressure has been significantly improved by preoxidation. The preoxidation was performed by heating the specimens, buried in a silica powder and encapsulated in a silica tube under a vacuum of 1.3 x 10(-3) Pa at 1200 K for 100 ks. After 20 cycles (400 hr) of oxidation the mass gain was still very small, and correspondingly the scale thickened very slightly. This superior oxidation resistance is attributable to the formation of a scale very rich in alumina by the preoxidation under a very low-oxygen partial pressure. This low-oxygen partial pressure may be near the dissociation pressure of-silica and much lower than that attained by modern vacuum pumps.

引用

页码：103 / 113

页数：11

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