Superplastic Forming of Ceramics

陶瓷的超塑性成型

• 批准号: 01850154
• 负责人: SAKUMA Taketo
• 金额: $ 6.66万
• 依托单位: The university of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research
• 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-01850154/
• 关键词: alumina; zirconia; Al_2O_3-ZrO_2; superplasticity; grain growth; Al_2O_3-ZrO_2; Al_2O_3ーZrO_2(アルミナ-ジルコニア)

The results obtained are summarized as follows,(1) The high-temperature deformability in TZP is improved by an addition of small amount of grain boundary glass phase. The addition of 5 wt% lithium-aluminosilicate glass results in about 200ﾟC decrease of superplastically deformed temperature. TZP containing this glass deforms superplastically at 1100ﾟC.(2) The marked grain growth and cavitation during high-temperature deformation retards the tensile ductility of high-purity Al_2O_3. The MgO addition effectively suppresses the grain growth of Al_2O_3 and consequently improves the ductility. The maximum elongation obtained is 70% at 1400ﾟC.(3) The high-temperature flow stress in Al_2O_3-ZrO_2 depends markedly on zirconia content. A sharp peak value is obtained in Al_2O_3-2wt%ZrO_2. The composition dependence of flow stress can qualitatively be explained by assuming that the grain boundary sliding is much difficult along Al_2O_3/ZrO_2 boundary than other boundaries.

结果表明：（1）少量晶界玻璃相的加入改善了TZP的高温变形性能。添加5wt%的锂铝硅酸盐玻璃导致超塑性变形温度降低约200 ℃。含有这种玻璃的TZP在1100 ℃下发生超塑性变形。(2)高温变形过程中晶粒长大和空洞化现象严重，阻碍了高纯Al_2O_3的拉伸塑性。MgO的加入有效地抑制了Al_2O_3晶粒的长大，从而提高了塑性。在1400 ℃时获得的最大延伸率为70%。(3)Al_2O_3-ZrO_2合金的高温流变应力与氧化锆含量有显著的关系。在Al_2O_3-2wt%ZrO_2体系中有一个尖锐的峰值。流变应力的成分依赖性可以定性地解释为沿沿着Al_2O_3/ZrO_2晶界滑动比沿其它晶界更困难。

项目成果

佐久間 健人: "セラミック材料学" 海文堂, 240 (1990)

佐久间健人：《陶瓷材料科学》 Kaibundo，240（1990）

Y. Yoshizawa and T. Sakuma: "The role of grain boundary glass phase on the superplastic deformation of tetragonal zirconia polycrystals" J. Am. Ceram. Soc.73. 3069-3073 (1990)

Y. Yoshizawa 和 T. Sakuma：“晶界玻璃相对四方氧化锆多晶超塑性变形的作用”J. Am。

Y.Yoshizawa,T.Sakuma: "Evolution of microstructure and grain growth in ZrO_2-Y_2O_3 alloys" ISIJ International. 29. 746-752 (1989)

Y.Yoshizawa，T.Sakuma：“ZrO_2-Y_2O_3 合金中微观结构和晶粒生长的演化”ISIJ International。

Y. Yoshizawa and T. Sakuma: "The Grain Growth Acceleration During High-Temperature Deformation in High-Purity Alumina" Mater. Sci. Eng.A149. 59-64 (1991)

Y. Yoshizawa 和 T. Sakuma：“高纯氧化铝高温变形过程中的晶粒生长加速”。

K.Okada,Y.Yoshizawa and T.Sakuma: "Grain-Size Distribution in Al_2O_3-ZrO_2 Generated by Annealing at High Temperatures" J.Am.Ceram.Soc.,. 74. 2820-2823 (1991)

K.Okada、Y.Yoshizawa 和 T.Sakuma：“高温退火生成的 Al_2O_3-ZrO_2 中的晶粒尺寸分布”J.Am.Ceram.Soc.,。