Ceramics-Silikáty 39, (4) 145 - 154 (1995) |
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INFLUENCE OF PRESSURE ON THE INTERACTION BETWEEN ALUMINA - MULLITE SHELL MOULDS AND MOLTEN NICKEL ALLOYS
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Cihlář Jaroslav 1, Maca Karel 1, Marquis Peter 2
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1 Institute of Materials Engineering, Department of Ceramics, Technical University of Brno, Technická 2, 616 69 Brno
2 University of Birmingham, Birmingham, Great Britain
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The interaction of ceramic alumina-mullite mould with nickel and nickel alloys (ZhS6K, NiTi and NiCr) was studied at a temperature of 1773K in the pressure range from 0.1 to 10⁵ Pa. The ceramic mould contained a continuous network of pores, which provided for the releasing of the gaseous phase at the mould(s)/metal(l) interface and thus facilitated physical and chemical erosion of the face layer of the mould at low pressures. Increasing the pressure of gaseous atmosphere to over 10⁴ Pa practically prevented the erosion of mould surface by nickel and its alloys. |
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