Abstract
The utilization of SiAlON ceramics at high speed machining of superalloys has been increasing day by day. In these operations, chemical wear, based on diffusion of tool and work-piece atoms towards each other due to high temperature and pressure at the cutting zone, is the dominant tool failure mechanism. In this study, dopant-dependent diffusion behavior of SiAlON ceramics, prepared by using different rare-earth elements (Y, Yb, Er and Ce), against Inconel 718 alloy was investigated. The SiAlON-Inconel 718 diffusion couples were manufactured by SPS technique. It was observed that the diffusion zone thickness was strongly dependent on the type of the rare-earth used in the composition and Er-doped SiAlON samples had a higher interaction zone in comparison to the others. Moreover, crystallization of grain boundary phase was observed as an effective parameter on the zone thickness for Er-doped compositions.
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