Swelling during sintering of titanium alloys based on titanium hydride powder

Robertson, I. M. and Schaffer, G. B. (2010) Swelling during sintering of titanium alloys based on titanium hydride powder. Powder Metallurgy, 53 1: 27-33. doi:10.1179/003258909X12502872942534

Author Robertson, I. M.
Schaffer, G. B.
Title Swelling during sintering of titanium alloys based on titanium hydride powder
Journal name Powder Metallurgy   Check publisher's open access policy
ISSN 0032-5899
Publication date 2010-03-01
Sub-type Article (original research)
DOI 10.1179/003258909X12502872942534
Volume 53
Issue 1
Start page 27
End page 33
Total pages 7
Place of publication Leeds, West Yorkshire, United Kingdom
Publisher Maney Publishing
Language eng
Formatted abstract
Compacts were prepared by pressing titanium and titanium hydride powders mixed with nickel powder and sintering under vacuum. Severe swelling was observed only for compacts based on TiH2 powder. Pressure changes in the vacuum furnace, dilatometry results and mass loss data all indicate that dehydrogenation of TiH2 powder compacts occurs at lower temperature than any significant sintering. Swelling appears to have been caused by a contaminant in the TiH2 powder rather than hydrogen. The onset of severe swelling during heating was associated with the formation of liquid phase as the solidus was crossed. However, some swelling appears to take place under solid state sintering conditions. Various results indicate that the mechanism of swelling is high gas pressure within closed pores. Large pores appear to form by breakage of ligaments between small pores followed by opening of the pore. It appears that the use of (uncontaminated) TiH2 powder in place of Ti powder would allow the benefit of lower green porosity to be retained during sintering to achieve low sintered porosity. © 2010 Maney Publishing.
Keyword Titanium
Titanium hydride
Powder processing
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Faculty of Engineering, Architecture and Information Technology Publications
Official 2011 Collection
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Citation counts: TR Web of Science Citation Count  Cited 11 times in Thomson Reuters Web of Science Article | Citations
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Created: Sun, 16 May 2010, 10:01:32 EST