Dense Uniformed Joints Between Molybdenum Disilicides and Stainless Steel Powders and Their Welding Behavior

Abstract

The dense uniformed joints between molybdenum disilicides (MoSi2) and stainless steel powders were prepared using the spark plasma sintering (SPS) technique with nine graded materials and their welding behavior was investigated. The results showed that such joints can be achieved using graded interlayers because the coefficient of thermal expansion (CTE) of each interlayer closely matched over a wide temperature range. Furthermore, the compatibility between the graded interlayers prevented MoSi2 with low toughness from the occurrence of microcracks resulted from the residual stresses formed during cooling of the joint. Moreover, the 9-layer joint with a thickness of 1.0 mm for each layer exhibited the minimum residual stress if the compositional exponent was 0.8.