Formation of Protective Oxide Scale with High Electrical Conductivity by High Temperature Oxidation of Alloys.

采用（La, Sr） CoO_3包覆Cr_2O_3合金的高温氧化方法，成功制备了高导电性的Cr_2O_3鳞片。对水垢进行显微组织分析发现，在水垢中有sr - cr -氧化物析出，且这些析出物可能是相互连接的。氧化物为SrCrO_4、Sr_3Cr_2O_8、Sr_3Cr_2O_7、Sr_2CrO_4。这些氧化物的电导率比Cr_2O_3大得多。构建了Sr-Cr-O体系的相图，并测定了这些氧化物的标准吉布斯生成能。这些结果可用于固体氧化物燃料电池合金分离器的设计。

The highly conductive Cr_2O_3 scale was successfully obtained by high temperature oxidation of Cr_2O_3 formig alloys coated with (La, Sr) CoO_3. Microstructural analysis on the scale found that the Sr-Cr-Oxides precipitated in the scale and that the precipitates probably connected each other. The oxides are SrCrO_4, Sr_3Cr_2O_8, Sr_3Cr_2O_7, Sr_2CrO_4. The electrical conductivity of thses oxides were much larger than that of Cr_2O_3. To estimate the distribution of these oxides in the scale, the phase diagram in Sr-Cr-O system was constructed and the standard Gibbs energy of formation of these oxides weredetermined. These results are applicable to the design of the alloy separator in solid oxide fuel cell.