Abstract
The influence of reaction‐bonded silicon nitride (RBSN) characteristics, especially the crystalline secondary phases formed during the nitridation process, on the densification behavior of RBSN and the resulting microstructure of the sintered material during postsintering under increased nitrogen pressure is discussed. The type and amount of the secondary phases are controlled by the chemical characteristics of the Si starting powder and the additive composition. Three different commercially available Si powders which reveal particular differences in the Fe and Al content were investigated, and a correlation between the microstructural characteristics of RBSN and of the postsintered materials is presented. It is shown that besides micropore size distribution the crystalline secondary phases play an important part in the densification behavior during postsintering and the resulting microstructure of postsintered reaction‐bonded silicon nitride.
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