Pure Ti fabricated by cold isostatic pressing and sintering TiH₂ powder

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.

KEYWORDS:

• Titanium
• powders
• density
• impurity
• properties

Acknowledgements

The author would like to acknowledge the support of College of Materials Science and Engineering of Jilin University in China, International Center of Future Science of Jilin University in China, G.V. Kurdyumov Institute for Metal Physics in Ukraine.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.