Platinum is a challenging material for casters because of its physical properties. Several casting studies have been presented in recent years. This paper provides a deeper understanding of the casting process by highlighting different aspects. The work started with an analysis of the material properties of five crucibles, three investment materials and two alloys to provide the basis for the simulation of the casting process. The simulation results were used to compare different tree setups suitable for centrifugal and tilt casting. They were critically compared with the results of instrumented casting trials with in-situ recording of the melt and flask temperatures. The role of process parameters on surface quality, porosity and form filling of the cast items was analyzed by 3D computer tomography and metallography. As a result, optimum process parameters for centrifugal and tilt casting were identified. Financial support by the German Federal Ministry of Economics and the industrial project partners is kindly acknowledged.

Author: Dr. Ulrich E. Klotz