Reactions in the systems MoSi3N4 and NiSi3N4 |
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Affiliation: | 1. College of Mechanical Engineering, Yangzhou University, 196 West Huayang Road, Yangzhou, Jiangsu 225127, PR China;2. Sensus Precision Die Casting (Yangzhou) Co., Ltd., South Huanghe Road, Yangzhou, Jiangsu 225200, PR China |
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Abstract: | The reaction products, formed during annealing of porous powder mixtures of Si3N4 with non-nitride forming metals like Ni or Mo, will depend on the partial pressure of N2 in the atmosphere. In a diffusion couple, however, nitrogen has to be released at the Si3N4-interface during the formation of a metal silicide. It cannot escape easily and builds up a higher pressure of nitrogen at this interface. Therefore, the reaction products are different from those in porous pellets. This has been verified for Ni Si3N4 and Mo Si3N4 couples. The role of traces of oxygen on these reactions will be discussed. |
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