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Metals 2017, 7(2), 67; doi:10.3390/met7020067

Titanium Powder Sintering in a Graphite Furnace and Mechanical Properties of Sintered Parts

Department of Chemical and Materials Engineering, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
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Academic Editor: Mark T. Whittaker
Received: 23 January 2017 / Revised: 19 February 2017 / Accepted: 20 February 2017 / Published: 22 February 2017
(This article belongs to the Special Issue Titanium Alloys 2017)
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Abstract

Recent accreditation of titanium powder products for commercial aircraft applications marks a milestone in titanium powder metallurgy. Currently, powder metallurgical titanium production primarily relies on vacuum sintering. This work reported on the feasibility of powder sintering in a non-vacuum furnace and the tensile properties of the as-sintered Ti. Specifically, we investigated atmospheric sintering of commercially pure (C.P.) titanium in a graphite furnace backfilled with argon and studied the effects of common contaminants (C, O, N) on sintering densification of titanium. It is found that on the surface of the as-sintered titanium, a severely contaminated porous scale was formed and identified as titanium oxycarbonitride. Despite the porous surface, the sintered density in the sample interiors increased with increasing sintering temperature and holding time. Tensile specimens cut from different positions within a large sintered cylinder reveal different tensile properties, strongly dependent on the impurity level mainly carbon and oxygen. Depending on where the specimen is taken from the sintered compact, ultimate tensile strength varied from 300 to 580 MPa. An average tensile elongation of 5% to 7% was observed. Largely depending on the interstitial contents, the fracture modes from typical brittle intergranular fracture to typical ductile fracture. View Full-Text
Keywords: titanium alloys; sintering; powder metallurgy; fracture titanium alloys; sintering; powder metallurgy; fracture
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Yu, C.; Cao, P.; Jones, M.I. Titanium Powder Sintering in a Graphite Furnace and Mechanical Properties of Sintered Parts. Metals 2017, 7, 67.

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