THERMAL SHOCK BEHAVIOR OF ZrO_2/Ni GRADED THERMAL BARRIER COATINGS
HU Wangyu; GUAN Hengrong; SUN Xiaofeng; LI Shizhuo; FUKUMOTO Masahiro;OKANE Isao(Institute of Metal Research; The Chinese Academy of Sciences; Shenyang 110015)(Department of Applied Physics; Hunan University; Changsha 410082)(Toyobashi University of Technology Toyobashi; Japan)Correspondent: SUN Xiaofeng; associate profssor Tel: (024)23843531-55608; Fax: (024)23891320
Cite this article:
HU Wangyu; GUAN Hengrong; SUN Xiaofeng; LI Shizhuo; FUKUMOTO Masahiro;OKANE Isao(Institute of Metal Research; The Chinese Academy of Sciences; Shenyang 110015)(Department of Applied Physics; Hunan University; Changsha 410082)(Toyobashi University of Technology Toyobashi; Japan)Correspondent: SUN Xiaofeng; associate profssor Tel: (024)23843531-55608; Fax: (024)23891320. THERMAL SHOCK BEHAVIOR OF ZrO_2/Ni GRADED THERMAL BARRIER COATINGS. Acta Metall Sin, 1998, 34(10): 1104-1114.
Abstract The failure behaviors of ZrO2/Ni graded thermal barrier coatings under the conditions of thermal shock with fiame jet and water quenching have been studied. The one-dimensi-onal analytic model of temperature and stress field under these conditions for the coatings hasbeen established. The thermal shock resistance of coatings increases with the increase of layersunder the condition of fiame jet and decreases with the increase of layers under the condition ofwater quenching, which can be reasonably explained with the present model. The thermal shockresistance depends on the thermal shock conditions, and is determined by the magnitude anddirection of the surface heat exchange coefficiellt. Therefore, it is necessary to choose suitablethermal shock condition to evaluate the ability to resist shock of coatings. For thermal barriercoatings which are applied to the turbine blade of aeroengine or under the matchable thermalshock conditions, gradient structure mny sigIilficantly improve their ability to resist thermal shock.
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