Pure Ti fabricated by cold isostatic pressing and sintering TiH2 powder

Abstract

ABSTRACT The use of TiH2 as initial powder can produce nearly full-density titanium with good mechanical properties. In this paper, compaction and sintering behaviors of TiH2 and HDH Ti powders were investigated at various combinations of particle size distributions, pressures, and compact methods. Main attention was given to a manufacturing route that included cold isostatic pressing (CIP) is potentially capable of producing complicated shape components with homogeneous density distributions. The results showed the priority of using TiH2 powder as a starting material in the CIP-and-sinter manufacturing route. Compared to materials processed from HDH Ti powder, the TiH2-based materials showed lower porosity, more homogeneous distribution of fine spherical pores, and lower oxygen content, reaching a property balance that met requirements of CP Ti specifications. Advantage of CIP over uniaxial die pressing (UDP) was also shown and explained by specific features of the two compaction methods. The higher sintered density (99.1%) and acceptable oxygen content (0.18%) of the materials processed from TiH2 powder of 0–45 µm provide mechanical characteristics (UTS 516.1 MPa, Elongation 26.8%) suitable for practical application.