Abstract
It is well known that large thermal stress arises in a ceramic-metal joint through thermal expansion mismatch. We have dealt with analytically a "compressive" joint in which thermal expansion coefficient of the ceramic part is smaller than that of the metal part.
In this paper, we apply the theory to other joints composed of three layers with different thermal expansion coefficients. One of them is a ceramic-metal-ceramic joint, and the other is a ceramic-metal-metal joint. The former is prepared by bonding two ceramic rods through a metal layer. The latter is also prepared by placing another metal layer between a ceramic-metal joint to diminish thermal stress. Thermal stress occurring in the ceramic part of the joints is discussed as a function of the interlayer thickness. The result is found in qualitative agreement with a finite element calculation conducted by other authors.
