Interfacial reaction and cracking mechanism on oxidation of metal carbides

金属碳化物氧化的界面反应及裂解机理

• 批准号: 04453062
• 负责人: SHIMADA Shiro
• 金额: $ 3.46万
• 依托单位: Hokkaido University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04453062/
• 关键词: Metal carbide; Oxidation mechanism; Interfacial reaction; Cracking; Carbon deposition; Reaction kinetics; 炭素析出; 炭素の析出; 炭化ジルコニウム; 単結晶

Oxidation of transition metal carbide (MeC, Me=Ti, Zr, Hf, Nb) was studied at an oxygen partial pressure of 4 - 16 kPa and in a temperature range of 400 to 800ﾟC, using the powder and single crystal samples. The oxidation mechanism was explained from a kinetic viewpoint and on SEM and TEM observation of the oxide/carbide interfaces. The summary was as follows ;Oxidatin of TiC proceeded by a diffusion-controlled process in four steps. Cracking occurred by formation of oxycarbide/titanium suboxide. Oxidation of ZrC produced two oxide scale zones 1 and 2. Zone 1 showed relatively pore-free scale containing 14 - 23 at%. Zone 2 contained many pores and large cracks with a carbon content of 7 - 10 at%. Zone 1 scale thickened parabolically in an early period, then is kept constant. In contrast, depth of zone 2 scale increased linearly with time. Oxidation behavior of HfC was quite similar to that of ZrC.Oxidation of NbC occurred by a phase boundary-controlled process which resulted from the porous scales having colmnar grains normal to the crystal surface.

使用粉末和单晶样品，在 4 - 16 kPa 的氧分压和 400 至 800°C 的温度范围内研究了过渡金属碳化物（MeC、Me=Ti、Zr、Hf、Nb）的氧化。从动力学角度以及氧化物/碳化物界面的 SEM 和 TEM 观察解释了氧化机理。总结如下：TiC 的氧化是通过扩散控制过程分四个步骤进行的。裂纹是由于碳氧化物/低氧化钛的形成而发生的。 ZrC 的氧化产生两个氧化皮区域 1 和 2。区域 1 显示出相对无孔的氧化皮，含有 14 - 23 at%。区域 2 含有许多孔隙和大裂缝，碳含量为 7 - 10 at%。 1区水垢早期呈抛物线状增厚，随后保持恒定。相比之下，2 区鳞片的深度随时间线性增加。 HfC的氧化行为与ZrC的氧化行为非常相似。NbC的氧化是通过相界控制过程发生的，该过程是由具有垂直于晶体表面的柱状晶粒的多孔鳞片产生的。

项目成果

S.Shimada M.Inagaki: "A Kinetic Study on Oxidation of niobium Carbide" Solid State Tonics. 63-65. 312-17 (1993)

S.Shimada M.Inagaki：“碳化铌氧化的动力学研究”固态补品。

S.Shimada,M.Inagaki: "A kinetic study on Opidation of riobium carbide" Solid State Jonics. 63-65. 312-17 (1993)

S.Shimada，M.Inagaki：“碳化铷的阿哌啶动力学研究”固态 Jonics。

S.Shimada: "Oxidation of TiC at low Temperatupe" Joumal of Materials Science. 27. 1869-1875 (1992)

S.Shimada：“TiC 在低温下的氧化”材料科学杂志。

Shiro SHIMADA: "A KINETIC STUDY ON OXIDATION OF NIOBIUM CARBIDE" Solid State Ionics.

Shiro Shimada：“碳化铌氧化的动力学研究”固态离子学。

S.Shimada: "A Kinetic Study on Oxidation of Niobium Carbide" Solid State Jonics. 63-65. 312-317 (1993)

S.Shimada：“碳化铌氧化的动力学研究”固态 Jonics。