Reaction between Ti and boron nitride based investment shell molds used for casting titanium alloys
来源期刊：Rare Metals2008年第6期
论文作者：LIU Hongbaoa, SHEN Bina, ZHU Mingb, ZHOU Xinga, and MAO Xiemina a School of Materials Science and Engineering, Shanghai University, Shanghai , China b General Research Institute for Nonferrous Metals, Beijing , China
文章页码：617 - 622
摘 要：The aim of this paper was to study the reaction between a Ti-6Al-4V alloy and boron nitride based investment shell molds used for invest- ment casting titanium. In BN based investment shell molds, the face coatings are made of pretreated hexagonal boron nitride （hBN） with a few yttria （Y2O3） and colloidal yttria as binder. The Ti-6Al-4V alloy was melted in a controlled atmosphere induction furnace with a segment water-cooled copper crucible. The cross-section of reaction interface between Ti alloys and shell mold was investigated by electron probe micro-analyzer （EPMA） and microhardness tester. The results show that the reaction is not serious, the thickness of the reacting layer is about 30-50 μm, and the thickness of α-case is about 180-200 μm. Moreover the α-case formation mechanism was also discussed.
LIU Hongbaoa, SHEN Bina, ZHU Mingb, ZHOU Xinga, and MAO Xiemina a School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China b General Research Institute for Nonferrous Metals, Beijing 100088, China
摘 要：The aim of this paper was to study the reaction between a Ti-6Al-4V alloy and boron nitride based investment shell molds used for invest- ment casting titanium. In BN based investment shell molds, the face coatings are made of pretreated hexagonal boron nitride （hBN） with a few yttria （Y2O3） and colloidal yttria as binder. The Ti-6Al-4V alloy was melted in a controlled atmosphere induction furnace with a segment water-cooled copper crucible. The cross-section of reaction interface between Ti alloys and shell mold was investigated by electron probe micro-analyzer （EPMA） and microhardness tester. The results show that the reaction is not serious, the thickness of the reacting layer is about 30-50 μm, and the thickness of α-case is about 180-200 μm. Moreover the α-case formation mechanism was also discussed.
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