Enhancing the adhesive bonding strength of NiTi shape memory alloys by laser gas nitriding and selective etching

Hau Chung Man, N. Q. Zhao

Research output: Journal article publicationJournal articleAcademic researchpeer-review

29 Citations (Scopus)

Abstract

Laser gas nitriding process (LGN) was applied on NiTi shape memory alloy to obtain an alloyed surface consisting of TiN dendrites in NiTi matrix. By applying subsequent selective etching process, the matrix material in the alloyed layer can be selectively removed and a three-dimensional network of TiN dendrites is left on the surface protruding from the metal substrate. The 3D dendritic network provides extra surface area and locking mechanism for the adhesion joint. The microstructures of such textured surface were examined. The adhesion jointing characteristics of the surfaces were studied. A 150% increase in the lap-joint strength was achieved in the laser gas nitrided and etched specimen as compared with the sandblasted and etched ones.
Original languageEnglish
Pages (from-to)1595-1600
Number of pages6
JournalApplied Surface Science
Volume253
Issue number3
DOIs
Publication statusPublished - 30 Nov 2006

Keywords

  • Adhesive bonding
  • Laser gas nitriding
  • NiTi alloy
  • Shape memory alloy
  • Textured surface

ASJC Scopus subject areas

  • Surfaces, Coatings and Films

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