Effect of Temperature and Phase Constitution on Kinetics of La Diffusion

查看全文 作　　者：阎牧夫;Sun Y;Bell T;刘志儒;夏立芳 出　　处：《Journal of Rare Earths》索引2002年第20卷第4期,共4页 基　　金：ProjectsupportedbytheEuropeanCommissionunderBRITE/EURAMProgrammeBPRP CT970 5 46andbytheNationalNaturalScienceFoundationofChina ( 5 0 0 710 2 0 ) 摘　　要：The diffusion of La in ε-Fe 2~3N(ε)and γ′-Fe 4N (γ′)phases produced by plasma nitriding was studied. It is found that with increasing nitriding time, the ε phase continuously decomposes into γ′ one under employed experimental conditions and compared with γ′ phase or ε+γ′ ones, the mono one ε has an impedient effect on depth of La diffusion. The growth of La layer in dual phases and mono one follows an approximate exponential law and a parabolic one, respectively, and this kinetics law does not change with increasing temperature. The effect of increasing temperature in the range of 520 to 560 ℃ on La diffusion depth is less than that of phase constitution change such as the decomposition of ε phase into γ′ one. 关 键 词：镧 扩散 动力学 温度 相结构