酸化亜鉛および酸化ニッケルを含有する溶融 CaO-SiO_2 系酸化物中の酸素の輸送現象

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Oxygen transfer rates, P, through molten NiO-CaO-SiO_2, ZnO-CaO-SiO_2 and NiO-ZnO-CaO-SiO_2 systems were measured by using a molten thin film penetration method developed by the author. Temperatures of the measurement were about 1450, 1500 and 1550℃. The transfer rates were 1 to 5 time 10^<-8> mol・O_2・cm^<-1>・s^<-1>. They were the same order of the magnitude as that in the case of iron oxide-CaO-SiO_2 system measured previously. In the case of system containing NiO, the more NiO contents the higher oxygen transfer rate. On the other hand, in the case of system containing ZnO, the higher ZnO contents the higher oxygen transfer rate in the case of less than 20mol%ZnO and the higher ZnO contents the lower oxygen transfer rate in the case of more than 20%ZnO. Effects of constituent on oxygen transfer rate, P, with the unit of mol O_2・cm^<-1>・s^<-1> are empirically expressed as follows : System less than 12.5 mol%NiO : P=3.15×10^<-9>(mol%NiO) System less than 35mol%ZnO : P=-8.5×10^<-11>(mol%ZnO-22)^2+4.2×10^<-8> Temperature dependencies of the oxygen transfer rates are as follows : 7.5 mol%NiO-46.3 mol%CaO-46.3 mol%SiO_2 : P=3.51×10^<-2>exp(-25.3×10^3/T) 10 mol%ZnO-45 mol%CaO-45 mol%SiO_2 : P=3.24×10^<-2>exp(-25.3×10^3/T) 20 mol%ZnO-40 mol%CaO-40 mol%SiO_2 : P=6.39×10^<-2>exp(-25.3×10^3/T) 30 mol%ZnO-35 mol%CaO-35 mol%SiO_2 : P=4.96×10^<-2>exp(-25.3×10^3/T) It was estimated that NiO and ZnO acted as p- and n-type semiconductors, respectively, on the basis of the discussion on the dependency of the transfer rate on oxygen partial pressure at the surface of the molten oxide.
社団法人日本鉄鋼協会の論文
1990-02-01

酸化亜鉛および酸化ニッケルを含有する溶融 CaO-SiO_2 系酸化物中の酸素の輸送現象

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