Whisker growth in reduction of oxides
Whisker growth in reduction of oxides
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DOI：
10.1007/bf02657290
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发表时间：
1984-12
期刊：
影响因子：
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通讯作者：
Mei Chang;L. Jonghe
中科院分区：
文献类型：
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作者：
Mei Chang;L. Jonghe
在1173 K、总压6.6 × 103 ~ 3.3 × 104 Pa、CO/CO2比2.9 ~ 11.8的CO-CO2混合气体中还原钴铁氧体（CoFe 2 O 4）。还原导致金属晶须的形成。实验和分析强调了晶须直径在还原过程中的行为。钙和钾等杂质会刺激金属成核，但似乎会抑制金属/气体/氧化物三重结处气体反应的催化作用。稳态晶须直径被发现是成反比的总气体压力在恒定的CO/CO2比。提出了一个新的模型来解释晶须的发展。它认为金属/氧化物界面扩散耦合金属/氧化物/气体的三重结反应在晶须基地的过程中确定的晶须直径。
Cobalt ferrite (CoFe2O4) was reduced in CO-CO2gas mixtures at 1173 K at total pressure between 6.6 × 103and 3.3 × 104Pa, and at CO/CO2ratios between 2.9 and 11.8. The reduction led to the formation of metal whiskers. The experiments and analysis emphasized the behavior of the whisker diameter during reduction. Impurities such as calcium and potassium stimulate metal nucleation but appear to inhibit catalysis of gas reactions at the metal/gas/oxide triple junction. The steady state whisker diameter was found to be inversely proportional to the total gas pressure at constant CO/CO2ratio. A new model is proposed to explain whisker development. It considers metal/oxide interface diffusion coupled with a metal/oxide/gas triple junction reaction at the whisker base as the process determining the whisker diameter.