Extrusion and selected engineering properties of Mo–Si–B intermetallics

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• 作者：Summers ; E. ; Thom ; A.J. ; Cook ; B. ; Akinc ; M.
• 关键词：A. Intermetallics ; miscellaneous ; A. Molybdenum silicides ; Extrusion
• 刊名：Intermetallics
• 出版年：2000
• 期刊代码：36_09669795
• 类别：ms
• 出版时间：September, 2000
• 卷：8
• 期：9-11
• 页码：1169-1174
• 文件大小：503 K

摘要

In this study, an extrusion process has been developed to produce defect free, high-density rods of Mo–Si–B material. An initial powder composition (53.5 vol.%, 91 wt.%) of 66 vol.%Mo₅Si₃B_x (T1)–16 vol.%MoB–18 vol.%MoSi₂ was mixed with a paraffin-wax based binder (46.5 vol.%, 9 wt.%) and extruded using a twin-screw extruder. Following binder removal by a combination process of wicking and thermal degradation, the material was sintered at 1800°C. The bulk density of the sintered material was 90–92%of theoretical. Thorough binder removal was evidenced by low impurity levels: 258±6 ppm carbon and 772±10 ppm oxygen. The material demonstrated excellent high temperature oxidation resistance. The calculated parabolic rate constant is 1.1×10⁻² mg²/cm⁴/h at 1600°C. The extruded material was also successfully tested as a resistance heating element. These materials show promise for the development of heating elements with enhanced performance compared to current MoSi₂-based heating elements.