A Study of hBN-Y2O3 Composite Investment for Casting Ti-6Al-4V Alloy
An hBN-Y2O3 composite investment moulding material was developed for investment casting Ti-6Al-4V alloy. Hexagonal boron nitride (hBN) powders plus a few Y2O3 powders were used as the investment mould material to prepare the shell mould with colloidal yttria as binder. The results show that the hBN-Y2O3 composite investment mould can be used to cast Ti-6Al-4V alloy, and has lower cost compared with the traditional yttria based investment mould, because of chemically inert of hexagonal boron nitride and its lower density. Moreover the interfacial reaction between the Ti and hBN-Y2O3 composite shell mould was investigated with measurement of microhardness and scanning electron microscopy (SEM) with energy dispersive (EDS).
Young Won Chang, Nack J. Kim and Chong Soo Lee
B. Shen et al., "A Study of hBN-Y2O3 Composite Investment for Casting Ti-6Al-4V Alloy", Materials Science Forum, Vols. 561-565, pp. 1035-1038, 2007