ABSTRACT

Since the ceramic has excellent qualifies in light weight, abrasion resistance and heat resistance etc., compared with the metal, it has been actively examined in order to apply for the structures such as gas turbine and turbo-charger etc., which require high strength and heat resistance. But it is not desirable to be used for the structural material since the ceramic is fragile, so the joint with the metal with abundant toughness has been studied. However, during the cooling process, the joint residual stress develops on the ceramic/metal joint by the difference in thermal expansion coefficient between two materials and this joint residual stress affects the bending strength significantly: Also in order to use the joint material as the structural material, the study about the fatigue of thermal cycle of actual use statement is necessary Therefore, to ensure security and improvement of the bending strength of joint material, we studied the state of residual stress distribution to the high temperature-thermal cycle, and studied the effects of thermal cycle and state of residual stress distribution on the strength of joint material as well.

i. Introduction

Recently, it is actively examined to use ceramic material instead of metal material for the structures such as gas turbine, turbo-charger, which require light weight, high strength and heat resistance. And it is practically used in some cases. But, even though the ceramic is excellent in light weight, wear-resistance, and high heat resistance etc, it is very difficult to use the ceramic material for the general structural material because it has the fatal weakness in collision resistance, toughness strength and manufacturing process. Therefore using the ceramics/metal as the joint material with the metal with abundant toughness removing those weakness of ceramic, it can be used in practical structures as the material complementing good property and weakness.

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