Investigation into refractories as crucible and mould materials for melting and casting γ-TiAl alloys

被引：110

作者：

Kuang, JP ^{[1
]}

Harding, RA ^{[1
]}

Campbell, J ^{[1
]}

机构：

[1] Univ Birmingham, IRC Mat High Performance Applicat, Birmingham B15 2TT, W Midlands, England

来源：

MATERIALS SCIENCE AND TECHNOLOGY | 2000年 / 16卷 / 09期

关键词：

D O I：

10.1179/026708300101508964

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

An assessment has been made of the suitability of magnesia, calcia, alumina, and yttria for manufacturing melting crucibles and investment casting moulds for gamma-TiAl alloys. Small refractory crucibles have been prepared by pressing or plasma spraying techniques and used to melt a small quantity of a Ti - 48Al - 2Nb - 2Mn (at.-%) alloy in a carbon resistance furnace. The effects of the refractory type and melting time on the oxygen content, penetration, and microstructure have been established. The depth of penetration versus the holding time at 1550 degrees C can be expressed by a power law. Based on these small-scale tests, it can be concluded that magnesia and silica containing alumina are unsuitable, whereas both pure calcia, yttria, and yttria-coated magnesia show promise for melting and casting gamma-TiAl alloys. MST/4439.

引用

页码：1007 / 1016

页数：10

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