| Reaction between Ti and boron nitride based investment shell molds used for casting titanium alloys |
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| 作者单位： | 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 |
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| 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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| 关 键 词： | 氮化硼 外壳空模型 钛合金 界面反应 熔模铸造 |
| 收稿时间： | 26 February 2008 |
| 修稿时间： | 25 March 2008 |
Reaction between Ti and boron nitride based investment shell molds used for casting titanium alloys |
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| Authors: | Hongbao LIU Bin SHEN Ming ZHU Xing ZHOU Xiemin MAO |
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| Affiliation: | [1]School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China [2]General Research Institute for Nonferrous Metals, Beijing 100088, China |
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| Abstract: | The aim of this paper was to study the reaction between a Ti-6A1-4V alloy and boron nitride based investment shell molds used for investment 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-6A1-4V 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 tun,and the thickness of ct-case is about 180-200 μm.Moreover the o-case formation mechanism was also discussed. |
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| Keywords: | boron nitride shell mold titanium alloy interface reaction investment casting |
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