ISSN: 1003-6326
CN: 43-1239/TG

Vol. 26    No. 10    October 2016

Oxidation resistance of Si-coated TZM alloy prepared through combined process of plasma spray and laser surface melting
Jeong-Min KIM1, Tae-Hyung HA1, Joon-Sik PARK1, Hyun-Gil KIM2
(1. Department of Advanced Materials Engineering, Hanbat National University, Daejeon 34158, Korea;
2. Korea Atomic Energy Research Institute, Daejeon 34057, Korea
Abstract: Plasma thermal spraying of Si coating layer on titanium-zirconium-molybdenum (Ti-Zr-Mo), TZM alloy, was conducted for the surface protection of the Mo substrate that is unstable in air at high temperatures. Although the plasma thermal spraying alone could protect the Mo alloy from oxidation at a high temperature for a short time, the post laser surface melting process further improved the oxidation resistance of Si-coated alloy. In the case of the post laser treated specimen, MoSi compounds, mainly MoSi2 phases, were formed during the additional annealing process, and the oxidation resistance could be even further enhanced. The corrosion behaviors of Si-coated specimens in 3.5% NaCl solution were also investigated; however, no significant variations with respect to the post treatment procedure were found.
Key words: Ti-Zr-Mo alloy; Si; oxidation; plasma spray; laser melting
Superintended by The China Association for Science and Technology (CAST)
Sponsored by The Nonferrous Metals Society of China (NFSOC)
Managed by Central South University (CSU)