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Microstructure and Tribological Properties of Ti5Si3 Coating In-situ Synthesized on Titanium Substrate by Laser Cladding

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Author(s): GUO Chun, ZHOU Jian-Song, CHEN Jian-Min

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 27;
Issue: 9;
Start page: 970;
Date: 2012;
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Keywords: titanium; laser cladding; coating; Ti5Si3; tribological property

ABSTRACT
Using silicon powder as the precursor to improve the wear resistance of Ti5Si3 coating was in situ successfully synthesized on Ti substrate by laser cladding. Friction and wear behavior of Ti5Si3 coatings under different normal loads and sliding speeds wear test conditions were evaluated using a UMT-2MT friction and wear tester. It is found that the prepared coating is mainly composed of Ti5Si3 and Ti phases. The high resolution transmission electron microscopy results confirm further the existence of Ti5Si3 compound in the prepared coating. Ti5Si3 coating has spherical and block-like microstructure. The Ti5Si3 coating shows a high average hardness of approximately 840 HV0.2, which is about 4.4 times as that of Ti substrate. Tribological properties of the prepared Ti5Si3 coating were systematically evaluated. It is found that the Ti5Si3 coating can improve the wear resistance of Ti. The wear mechanism of Ti5Si3 coating is abrasive and adhesive wear when sliding against GCr15 steel ball under all wear conditions.

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