A MOLD MATERIAL USED FOR TITANIUM-ALUMINUM ALLOY—CALCIA
(School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, P. R. China)
Abstract: The effects of binder, additive and sintering temperature on the properties of calcia as a mold material used for titanium-aluminum alloys have been studied. The results showed that the solution of CaCl2C2H5OH is the best binder for calcia, the additive of CaF2 not only increases the strength but also the antiwatering property of calcia; sintering at 900~1 000℃is adaptable. The contamination of calcia on titaniumaluminum alloy castings has been studied, and the experimental results showed that the thickness of contamination is less than 15μm.
Key words: titanium-aluminum alloy mold material calcia casting