Reaction between Ti and boron nitride based investment shell molds used for casting titanium alloys

稀有金属（英文版）, 2008, 27(6): 617-622.

^1, , ^2, , ^3, , ^4, , ^5,

1.School of Materials Science and Engineering,Shanghai University,Shanghai 200072,China

2.School of Materials Science and Engineering,Shanghai University,Shanghai 200072,China

3.General Research Institute for Nonferrous Metal,Beijing 100088,China

4.School of Materials Science and Engineering,Shanghai University,Shanghai 200072,China

5.School of Materials Science and Engineering,Shanghai University,Shanghai 200072,China

Reaction between Ti and boron nitride based investment shell molds used for casting titanium alloys

LIU Hongbao ^1, , SHEN Bin ^2, , ZHU Ming ^3, , ZHOU Xing ^4, , MAO Xiemin ^5,

1.School of Materials Science and Engineering,Shanghai University,Shanghai 200072,China

2.School of Materials Science and Engineering,Shanghai University,Shanghai 200072,China

3.General Research Institute for Nonferrous Metal,Beijing 100088,China

4.School of Materials Science and Engineering,Shanghai University,Shanghai 200072,China

5.School of Materials Science and Engineering,Shanghai University,Shanghai 200072,China

Keywords： boron nitride

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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Reaction between Ti and boron nitride based investment shell molds used for casting titanium alloys

参考文献