アルミナ, ジルコニア, マグネシア系サーメットの予備的研究

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The green bodies of the oxide cermets containing NiO or Fe2O3 were sintered in a hydrogen furnace in which these metal oxide components were reduced to their respective metals.The particle size of these reduced metals at the lower temperature stage of sintering was expremely small, therefore the strength of the cermets obtained was high. The shrinkage in sintering was, however, a little higher than that of the ordinary cermets in which metal components are added.The sintering temperature for oxide cermets containing nickel was always around 1670°C for various contents of metal, while that for those containing iron decreased as the content of iron was increased, namely, 1550°C for 30% iron content. Also similar results were obtained in the cases of the other oxide cermets studied, and it is suggested that the properties of the boundary of oxide-to-metal in the oxide cermet are very different between the respective cermets containing nickel and iron metal.The microstructures of oxide cermets containing 0-70 percent metals revealed that the oxide phase was continuous while the metal phase was discontinuous. Therefore, the properties of cermets are thought to be determined chiefly by the properties of their oxide phase. Thus the superiority of the cermets of alumina series among the oxide cermets studied for the mechanical strength as well as the thermal shock resistance was explained.Althongh the crystal size in oxide phase of the cermet is much smaller than that of pure oxide body, the size of metal particles in the 30% metal-containing cermet is about 10μ, and in the case of 70% metal-containing cermet, larger grogs of metal are present in nickel cermet, and metal particles gathered into long strings are found in iron cermet. Investigations on the broken samples of cermets showed that the breaks took place at these boundaries, and that for nickel cermet, these boundaries were especially weak.
社団法人日本セラミックス協会の論文
1956-09-01

アルミナ, ジルコニア, マグネシア系サーメットの予備的研究

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