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

合金高温氧化形成高导电率的保护性氧化皮。

• 批准号: 06453084
• 负责人: MARUYAMA Toshio
• 金额: $ 3.97万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06453084/
• 关键词: High Temperature oxidation; Highly conductive oxide scale; Sr-Cr-O system; Phase diagram; Standard Gibbs energy of formation; 固体燃料電池; セパレータ; 導電率; 標準生成自由エネルギー; SrCrO_4; Sr_3Cr_2O_8; Sr_3Cr_2O_7; 高導電率酸化皮膜; 標準生成自由エネルギ

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.

通过对(La,Sr)CoO_3涂层Cr_2O_3形成合金进行高温氧化，成功获得了高导电Cr_2O_3鳞片。对氧化皮的显微结构分析发现，氧化皮中析出了 Sr-Cr-氧化物，并且这些析出物可能相互连接。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远大于Cr_2O_3。为了估计这些氧化物在氧化皮中的分布，构建了Sr-Cr-O体系中的相图并确定了这些氧化物的标准吉布斯形成能。这些结果适用于固体氧化物燃料电池中合金隔板的设计。

项目成果

Toshio Maruyama: "Electrical Conductivity of SrCrO_4 and Sr_2Cr_2O_8 at Elevated Temperatures in Relation to the Highly Conductive Chromia Scale Formed on an Alloy Sepaarator in SOFC" Proc.of the 4th International Symposium on Solid Oxide Fuel Cells. 889-

Toshio Maruyama：“SrCrO_4 和 Sr_2Cr_2O_8 在高温下的电导率与 SOFC 合金分离器上形成的高导电铬垢的关系”，第四届固体氧化物燃料电池国际研讨会论文集。

Thoru Shiomitsu: "The Influence of (La, Sr) CoO3 coatings on the Electrical Resistance of Ni-20Cr Alloys in High Temperature Oxidizing Atmosphere" Proc.of the 4th International Symposium on Solid Oxide Fuel Cells. 850-857 (1995)

Thoru Shiomitsu：“高温氧化气氛中(La,Sr)CoO3涂层对Ni-20Cr合金电阻的影响”第四届固体氧化物燃料电池国际研讨会论文集。

Toshio Maruyama: "Elecfrical Coneclucfivily of SrCrO_4 and Sr_3Cr_2O_8 at Ezlevcted Teaperaturen in Relation to Highlyconcbehive Chumia Scale" Proc.of 4th Iutem.Sympo on Solid Oxile Fael Cell. 889-894 (1995)

Toshio Maruyama：“Ezlevcted Teaperaturen 中 SrCrO_4 和 Sr_3Cr_2O_8 的电连接与高浓度 Chumia 量表相关”Proc.of 4th Iutem.Sympo on Solid Oxile Fael Cell。

Tohru SHIOMITSU: "The Influeme of (La,Sr) CoO_3 Coatings on Flcctricul Resislarce of Ni-20 CrAllcys" Proc.of 4th Fntem.Sympo on Solicl Oxiocle Fuel Cell. 850-857 (1995)

Tohru SHIOMITSU：“(La,Sr) CoO_3 涂层对 Ni-20 CrAllcys 耐摩擦性的影响”Proc.of 第四届 Fntem.Sympo on Solicl Oxiocle 燃料电池。