Interpretation of Stresses in the Glass Bonded Ferrites by Vickeres Indentation Method

,; ,; ,; ,; ,; ,; ,; ,; ,; ,

J. Korean Ceram. Soc. > Volume 30(6); 1993 > Article

Journal of the Korean Ceramic Society 1993;30(6): 469.

Vickeres Indentation법에 의한 페라이트와 접합유리에서의 응력해석

안정환, 제해준¹, 홍국선¹, 안재환, 고경현

아주대학교 재료공학과
¹한국과학기술연구원 세라믹스부

Interpretation of Stresses in the Glass Bonded Ferrites by Vickeres Indentation Method

ABSTRACT

Residual stresses is one of the major factors to degrade the magnetic properties of VCR magnetic heads. Vicker's indentation technique was adapted to estimate the residual stresses Residual stresses and distribution in the glass and ferrite were obtained after bonding ferrite with glass, varing the cooling rate. The compressive and tensile stresses were developed in the interface and gradually decreased with increasing distance from the interface. The stresses were decreased with a cooling rate. The mean values of residual stress in ferrite were 10MN/㎡, 8MN/㎡, 5MN/㎡ with cooling rate 10℃/min, 5℃/min, 1℃/min respectively. When the bonded sample was annealed above the glass transition temperature followed by cooling at 5℃/min cooling rate, the residual stress was reduced to 6MN/㎡.