Title: Dry sliding wear behaviour of Ti-TiB-TiNx in-situ composite synthesised by reactive hot pressing

Authors: J.I. Silva; A.C. Alves; A.M. Pinto; F.S. Silva; F. Toptan

Addresses: CMEMS-UMinho – Center for MicroElectroMechanical Systems, Universidade do Minho, Azurém, 4800-058 Guimarães, Portugal ' CMEMS-UMinho – Center for MicroElectroMechanical Systems, Universidade do Minho, Azurém, 4800-058 Guimarães, Portugal ' CMEMS-UMinho – Center for MicroElectroMechanical Systems, Universidade do Minho, Azurém, 4800-058 Guimarães, Portugal; Dept. Eng. Mecânica, Universidade do Minho, Azurém, 4800-058 Guimarães, Portugal ' CMEMS-UMinho – Center for MicroElectroMechanical Systems, Universidade do Minho, Azurém, 4800-058 Guimarães, Portugal; Dept. Eng. Mecânica, Universidade do Minho, Azurém, 4800-058 Guimarães, Portugal ' CMEMS-UMinho – Center for MicroElectroMechanical Systems, Universidade do Minho, Azurém, 4800-058 Guimarães, Portugal; Dept. Eng. Mecânica, Universidade do Minho, Azurém, 4800-058 Guimarães, Portugal

Abstract: Ti and its alloys are attractive materials for a variety of fields; however, a major problem of Ti and its alloys is their poor wear resistance. It is known that reinforcing Ti with hard ceramic phases can substantially improve the wear resistance. Thus, Ti-TiB-TiNx in-situ metal matrix composites were synthesised by reactive hot pressing utilising Ti/BN powder blends with 23:1 Ti:BN weight ratio. Ball-on-plate reciprocating dry sliding wear tests were performed against a 10 mm of alumina ball under 10 N normal load, at a frequency of 1 Hz, and with the total stroke length of 3 mm during 1,800 s. Results showed that the total wear volume loss was significantly decreased on the composite (11.4 ± 2.0 × 10−3 mm3) as compared to the unreinforced Ti (40.9 ± 4.2 × 10−3 mm3) due to the strengthening effect of the in-situ reinforcing phases.

Keywords: in-situ composites; titanium reinforcement; reactive hot pressing; dry sliding wear; titanium alloys; wear resistance; metal matrix composites; MMCs.

DOI: 10.1504/IJSURFSE.2016.077533

International Journal of Surface Science and Engineering, 2016 Vol.10 No.4, pp.317 - 329

Received: 11 Apr 2015
Accepted: 18 May 2015

Published online: 05 Jul 2016 *

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