|About this Abstract
||Liquid Metal Processing & Casting Conference (LMPC 2019)
||Liquid Metal Processing & Casting
||Investment Casting of High Reactive and High Melting Metals using Calcium Zirconate Crucibles
||Florian Bulling, Ulrich E. Klotz , Claudia Legner, F. König, Lisa Freitag, C. Faßaue, Christos G. Aneziris, Stefan Schafföner
|On-Site Speaker (Planned)
In the past investment castings of highly reactive metals were performed by vacuum arc remelting (VAR) to avoid contaminations caused by the crucible material. Especially titanium and its alloys require a very high stability of the refractory elements related to the melt components. In this work we describe the development of CaZrO3 crucibles for investment casting with vacuum induction melting (VIM). Casting trials were conducted with tilt-/ centrifugal-/ and electric arc casting machines. To investigate the reactivity and thermal resistance of the refractory material alloys of Ti, Pt, CoCr and Zr were tested with different casting parameters. In this context influence of pre-casting evacuation, super heating and dwell time of the melt were examined by chemical analysis, metallographic examination and mechanical testing. In comparison to other refractory crucibles a lower contamination of the cast product by the crucible material could be achieved, which resulted in beneficial mechanical properties.
||Definite: At-meeting proceedings