Niobium wires as space holder and sintering aid for porous NiTi

Ampika Bansiddhi*, David C Dunand

*Corresponding author for this work

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

When NiTi powder compacts containing Nb wires are heated above 1170°C, each Nb wire reacts with adjacent NiTi powders to form a eutectic liquid which wicks into the space between the remaining NiTi powders. This creates a macropore at the location of the Nb wire while eliminating the microporosity between NiTi powders which is filled with a NiTi/Nb eutectic phase after solidification. This novel method produces - in a single step and without applied pressure - a dense NiTi matrix with elongated pores suitable for shape memory or superelastic applications such as bone implants, dampeners and actuators. Porous NiTi consisting of a dense NiTi matrix containing 3D-connecting, elongated pores is produced by a single step heat-treatment without applied pressure. When NiTi powder compacts containing Nb wires are heated above 1170°C, each Nb wire reacts with adjacent NiTi powders to form eutectic liquid which wicks into the space between the remaining NiTi powders. The location of the Nb wire becomes a macropore while the microporosity between NiTi powders is eliminated.

Original languageEnglish (US)
Pages (from-to)301-305
Number of pages5
JournalAdvanced Engineering Materials
Volume13
Issue number4
DOIs
StatePublished - Apr 1 2011

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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