Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Interfacial Characteristics of TiN Coatings on SUS304 and Silicon Wafer Substrates with Pulsed Laser Thermal Shock

  • Seo, Nokun (School of Materials Science and Engineering, Pusan National University) ;
  • Jeon, Seol (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 (School of Materials Science and Engineering, Pusan National University) ;
  • Lee, Heesoo (School of Materials Science and Engineering, Pusan National University)
  • Received : 2013.05.20
  • Published : 2014.01.25
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Abstract

TiN coatings prepared on different substrates that had different coefficients of thermal expansion were subjected to pulsed laser thermal shock and observed by using FIB milling to compare the deterioration behaviors. TiN coating on SUS304, which had a larger CTE (${\sim}17.3{\times}10^{-6}/^{\circ}C$) than the coating was degraded with pores and cracks on the surface and showed significant spalling of the coating layer over a certain laser pulses. TiN coating on silicon wafer with a smaller CTE value, ${\sim}4.2{\times}10^{-6}/^{\circ}C$, than the coating exhibited less degradation of the coating layer at the same ablation condition. Cracks propagated at the interface were observed in the coating on the silicon wafer, which induced a compressive stress to the coating. The coating on the SUS304 showed less interface cracks while the tensile stress was applied to the coating. Delamination of the coating layer related to the intercolumnar cracks at the interface was observed in both coatings through bright-field TEM analysis.

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