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A Study on Thermal Shock Characteristics of Functionally Gradient Ceramic/Metal Composites

경사기능성 세라믹/ 금속 복합재료의 열충격특성에 관한 연구

  • Song, Jun-Hee (Dept.of Precision Mechanical Engineering, Graduate School of Chonbuk National University) ;
  • Lim, Jae-Kyoo (Dept. of Mech. Design, Chonbuk National Univ.)
  • 송준희 (전북대학교 대학원 정밀기계공학과) ;
  • 임재규 (전북대학교 기계설계학과)
  • Published : 1996.07.01

Abstract

This study was carried out to anlayze the heat-resistant characteristics of functionally gradient material(FGM) composed with ceramic and metal. The thermal fracture behavior of plasma-sprayed FGM and conventional coating material(NFGM) was exaimined by acoustic emession technique under heating and cooling. Furnace cooling and rapid cooling tests were used to examine the effect of temperature change under various conditions, respectively. At the high temperature above $800^{\circ}C$, it was shown that FGM gives higher thermal resistance compared to NFGM by AE signal and fracture surface analysis.

Keywords

Functionally Gradient Material;Thermal Shock;Acoustic Emission;Thermal Barrier Coating;Delamination;Vertical Crack