Sintering of Layer Structure Materials: Effect of Starting Material on Sintering Defects and Residual Stress

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J. Korean Ceram. Soc. > Volume 36(1); 1999 > Article

Journal of the Korean Ceramic Society 1999;36(1): 61.

층상구조 재료의 소결: 출발물질이 소결결함 및 잔류응력에 미치는 영향

정연길

미국표준연구소

Sintering of Layer Structure Materials: Effect of Starting Material on Sintering Defects and Residual Stress

ABSTRACT

To analyze several defects and residual stress in sintering of layer structure materials, multiayer materials with TZP/SUS and ZT/SUS, and bilayer materials with porcelain/alumina and porcelain/Y-TZP were fabricated by sintering method. Multilayer materials prepared by pressureless sintering show the sintering defect such as warping, splitting, cracking originated from the difference of sintering shrinkage between each layer, which could be controlled by the adjustment of number and thickness in interlayer. In tape casting, a certain pressure given during sintering relaxed the sintering defects, specially warping. The residual stress in bilayer was examined with Vickers indentation method. A small tensile stress in porcelain/alumina and a large compressive stress in porcelain/Y-TZP were generated on the porcelain interface due to the thermal expansion mismatch, which affected the strength of bilayer materials. As a consequence, the sintering defects of multilayer materials and the residual stresses of bilayer materials were dominantly influenced on material design and starting material constants.

Key words: Sintering defect, Residual stress, Layer structure, Shrinkage, Thermal expansion mismatch