Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Thermal Shock Behavior of TiN Coating Surface by a Pulse Laser Ablation Method

  • Noh, Taimin (School of Materials Science and Engineering, Pusan National University) ;
  • Choi, Youngkue (School of Materials Science and Engineering, Pusan National University) ;
  • Jeon, Min-Seok (Material Testing Center, Korea Testing Laboratory) ;
  • Shin, Hyun-Gyoo (Material Testing Center, Korea Testing Laboratory) ;
  • Lee, Heesoo (School of Materials Science and Engineering, Pusan National University)
  • Received : 2011.08.30
  • Published : 2012.07.25
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Abstract

Thermal shock behavior of TiN-coated SUS 304 substrate was investigated using a laser ablation method. By short surface ablation with a pulse Nd-YAG laser, considerable surface crack and spalling were observed, whereas there were few oxidation phenomena, such as grain growth of TiN crystallites, nucleation and growth of $TiO_2$ crystallites, which were observed from the coatings quenched from $700^{\circ}C$ in a chamber. The oxygen concentration of the ablated coating surface with the pulse laser also had a lower value than that of the quenched coating surface by Auger electron spectroscopy and electron probe micro analysis. These results were attributed to the fact that the properties of the pulse laser method have a very short heating time and so the diffusion time for oxidation was insufficient. Consequently, it was verified that the laser thermal shock test provides a way to evaluate the influence of the thermal shock load reduced oxidation effect.

Keywords

Acknowledgement

Supported by : Ministry of Knowledge Economy

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