Titanium Casting Using Commercial Phosphate-bonded Investments with Quick Heating Method

Abstract

The purpose of this study was to investigate the possible use of quick heating method for titanium casting using two commercial investments(Rematitan Plus and Tancovest). The resulting characteristics of the investments with the quick heating method were as follows: residual thermal expansion at the casting temperature was in the range of 0.39 to 0.64％; green strength and fired strength ranged from 4.4 to 10.3 MPa and from 13.8 to 17.6 MPa, respectively. Five full crown titanium castings from each casting condition were obtained using an argon arc melting and gas pressure casting machine. The thickness of cast surface reaction layer was approximately 200μm, regardless of heating methods or investments. Further, the heating method did not significantly influence either the accuracy or surface roughness of the titanium castings. These results therefore suggested that these commercial investments for titanium could be used for the quick heating method.

Análise da técnica de fundição rápida segundo a adaptação cervical de infra-estrutura de liga à base de Ni-Cr e expansões de presa e térmica de quatro revestimentos

“…Esta idéia já havia sido cogitada por Stevens (1983) e necessita de um estudo mais aprofundado. Para Yan eTakahashi (2006), na técnica de fundição rápida, a expansão de presa não exerce influência na expansão térmica, mas observa-se neste estudo que os revestimentos utilizados já haviam atingido a completa expansão de presa antes de serem levados ao forno.…”