FEEDSTOCK INFILTRATION FOR MANUFACTURING OPEN CELLED Ti FOAM IN METAL INJECTION MOLDING TECHNOLOGY

摘要

This study was performed to fabricate open celled pure Ti foam using polymer space holder balls and the effects of temperature were investigated in compression process following infiltration of feedstock into perform of space holders. In compression temperature of 80°C, the sound open cellular structure was obtained with homogeneous Ti struts and pore fraction above 85% and then, the pores had diameters between 300 and 500μm. Despite of the high compressive stress of 700 MPa in the temperature, the polymer balls was not crush almost due to pseudo-hydrostatic stress state caused by the infiltrated Ti feedstock. However, increase of compression temperature to 90°C caused severe deformation of the polymer balls due to too high temperature and the resultant composite structures were very inhomogeneous.