Phase Transformation and Precipitation in Partially-Stabilized Zirconia

部分稳定氧化锆中的相变和沉淀

• 批准号: 01470061
• 负责人: SAKUMA Taketo
• 金额: $ 4.42万
• 依托单位: The university of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-01470061/
• 关键词: zirconia; phase transformation; phase transition; microstructure; precipitation; spinodal decomposition; 微構造; 熱力学; 状態図; 組織制御

The microstructure formed by the cubic-to-tetragonal (c-t) transformation was examined in detail. The domain structure and plate-like or lenticular microstructures were developed in tetragonal zirconia (t-ZrO_2) generated by rapid cooling from high-temperature cubic phase (cZrO_2). The c-t transformation was always completed with a formation of the domain structure. The modulated structure characteristic of spinodal decomposition was found in ZrO_2-Y_2O_3 annealed in the c-t two-phase region. From the microstructural evidence, the author has proposed that the c-t transformation has a nature of second-order phase transition.The thermodynamic analysis on the c-t equilibrium was made by assuming that this transformation is of the second-order type. The result satisfactorily explained the reported c-t equilibrium.

详细研究了由α-到-四氢呋喃（c-t）转变形成的显微结构。高温立方相（cZrO_2）快速冷却生成的四方氧化锆（t-ZrO_2）中出现了畴结构和板状或透镜状微观结构。c-t变换总是随着畴结构的形成而完成。ZrO_2-Y_2O_3在c-t两相区退火后具有调幅分解的调制结构特征。作者从微观结构上提出了c-t相变具有二级相变的性质，并在此基础上对c-t平衡进行了热力学分析。结果满意地解释了文献报道的c-t平衡。

项目成果

Y.Zhou,Q.L.Ge,T.C.Lei and T.Sakuma: "Diftusional cubic-to-tetragonal phase transtormation and microstructural evlution in ZrO_2-Y_2O_3 ceramics" J.Mater.Sci.,. 26. 4461-4467 (1991)

Y.Zhou，Q.L.Ge，T.C.Lei和T.Sakuma：“ZrO_2-Y_2O_3陶瓷中的扩散立方相到四方相转变和微观结构演变”J.Mater.Sci.，。

T. Sakuma: ""Phase transformation and microstructure of high-strength toughened zirconia"" Kinzoku. 59. 43-47 (1989)

T. Sakuma：“高强度增韧氧化锆的相变和微观结构”Kinzoku。

佐久間 健人: "高強度・高靭性ジルコニアの相変態と微細組織" 耐火材料. 138. 9-19 (1990)

Kento Sakuma：“高强度和高韧性氧化锆的相变和微观结构”耐火材料 138. 9-19 (1990)。

佐久間 健人,畠 英雄: "ZrO_2ーY_2O_3の立方晶ー正方晶無拡散変態と微細組織" 日本金属学会誌. 53. 972-979 (1989)

Kento Sakuma、Hideo Hatake：“ZrO_2-Y_2O_3 的立方-四方无扩散转变和微观结构”日本金属学会学报 53. 972-979 (1989)。

Y.Zhou,T.C.Lei and T.Sakuma: "Diftusionless cubic-to-tetragonal phase transition and microstructural evolution in sintered Zirconia-Yttria Ceramics" J.Am.Ceram.Soc.,. 74. 633-640 (1991)

Y.Zhou、T.C.Lei 和 T.Sakuma：“烧结氧化锆-氧化钇陶瓷中的无扩散立方相到四方相变和微观结构演化”J.Am.Ceram.Soc.,。