Nondestructive Evaluation of Thermal Shock Damage for Alumina Ceramics

알루미나 세라믹에 대한 열충격 손상의 비파괴적 평가

  • Published : 2001.08.01


The objective of this paper is to investigate the applicability of acoustic emission(AE) technique to monitor the progress of the thermal shock damage on alumina ceramic. For this purpose, alumina ceramic specimen was heated in the furnace and then was quenched in the water tank. When the specimen was quenched in the water tank, complex AE signals due to the initiation of micro-cracks and boiling effect were generated by the progress of thermal shock damage. These mixed AE signals have to be classified for monitoring the degree of the thermal shock damage of alumina ceramics. In this paper, the mixed AE signals generated from both the boiling effect and the crack initiation under thermal shock test was analyzed. The characteristics of AE signals were also discussed by considering the variation of bending strength and Yongs modulus of specimens.


Thermal Shock Damage;Al203 Ceamic;Elastic Modulus;Bending Strength;Acoustic Emission;Boiling Effect


  1. Badmi, C., Vecchia. M. La., 1997, 'Damage of 6061/SiCw Composite by Thermal Cycling,' J. Materials Science, Vol. 32, pp. 921-930
  2. Hasselman, D. P. H., 1964, 'Elastic Energy st Fracture and Surface Energy at Design Criteria for Thermal Shock,' J. Amer. Ceram. Soc., Vol. 46, No. 11, pp. 535-540
  3. Robert C. McMaster, 1982, 'Nondestructive Testing Handbook,' Vol. 2, ASNT
  4. Josef Krautkrmer and Herbert Krutkrmer, 1990, 'Ultrasonic Testing of Materials,' Springer-Verlag, Berlin, pp. 167-221
  5. Kurumada, A., et al., 1998, 'The Thermal Shock Resistance of a Joining Material of C/C Composite and Copper,' J. Nuclear Material, Vol. 258, No. 263, pp. 214-218
  6. 이준현, 이진경, 조윤호, 1998,' 세라믹의 열충격 손상거동 및 초음파 Lamb파를 이용한 비파괴적 손상거동,' 대한기계학회논문집 A권, 제22권 제12호, pp. 2278-2285
  7. 이진경, 이준현, 김부안, 1999, '알루미나 세라믹의열충격 손상에 따른 기계적 특성변화에 관한 연구,' 대한기계학회논문집 A권, 제23권 제9호, pp. 1507-1515
  8. Badalicance, R., Krohn, D. A., and Hasselman, D. P. H., 1974, 'Effect of Slow Crack Growth on the Thermal Stress Resistance of an Na2O-CaO-SiO2 Glass,' J. Amer. Ceram. Soc., Vol. 57, pp. 432-436
  9. Krizysztof, J. Donsztowicz, 1990, 'Crack Growth and Acoustic Emission in Ceramics during Thermal Shock,' J. Am. Ceram. Soc., Vol. 73, No. 3, pp. 502-508
  10. Lewis, D., 1983, 'Thermal Shock and Thermal Shock Fatigue Testing of Ceramics with the Water Quench Test,' in Fracture Mechanics of Ceramics, Vol. 6, pp. 487-496
  11. Johnson-Walls, D., Drory, M. D. and Evans, A. G., 'Evaluation of Reliability of Brittle components by Thermal Stress Testing,' J. Amer. Ceram. Soc., Vol. 68, No. 7, pp. 363-367