Boriding behaviour of titanium alloys with different crystalline structures


Kara G. , Pürçek G.

SURFACE ENGINEERING, vol.35, no.7, pp.611-617, 2019 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 35 Issue: 7
  • Publication Date: 2019
  • Doi Number: 10.1080/02670844.2018.1552646
  • Title of Journal : SURFACE ENGINEERING
  • Page Numbers: pp.611-617

Abstract

The objective of this study is to investigate the boriding behaviour of titanium implant materials on the basis of their crystalline structure and chemical composition. alpha-type Cp-Ti, alpha + beta type Ti-6Al-4V and beta-type Ti-45Nb alloys have been borided by the powder-pack boriding technique at temperatures between 850 and 1200 degrees C. The X-ray diffraction, GDOES and SEM analysis demonstrated that boride layers on Cp-Ti and Ti-6Al-4V alloy mainly composed of TiB2 and TiB phases, whereas Ti-45Nb alloy consists of the mixture of TiB2.NbB2 and TiB phases. Boride layers on Ti-45Nb alloy grew uniformly and the highest boride layer thickness of 72.1 mu m was obtained on this alloy among the others. Activation energies of boron in monolithic layer of Cp-Ti and Ti-6Al-4V alloy were determined to be 214.5 and 231.8 kJ/mol, respectively. Activation energies in monolithic and total boride layers on Ti-45Nb were determined to be 228.5 and 145.8 kJ/mol, respectively.