Abstract
In this study, thermal fatigue lifetimes of S45C/Cu/Si_3N_4 composites subjected to cyclic thermal loadings were evaluated. First, S45C/Cu/Si_3N_4 composites with interlayer thicknesses of 150 and 200 μm were prepared. Next, thermal fatigue tests were carried out at temperature differences of 275 K and 575 K. The cycles to failure of the composites were evaluated and a model for predicting thermal fatigue life was proposed. In addition, the suitability of theoretical model was considered. The results revealed that temperature difference of cyclic thermal loading and thickness of Cu interlayer have effects on thermal fatigue lifetimes.
