Study on Strength and Fatigue of Ceramic Materials

陶瓷材料强度与疲劳研究

• 批准号: 58430014
• 负责人: SOGA Naohiro
• 金额: $ 18.94万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (A)
• 财政年份: 1983
• 资助国家: 日本
• 起止时间: 1983 至 1985
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-58430014/
• 关键词: Ceramics; strength; stress corrosion; grain boundary; amorphous state; 破壊靭性

In order to clarity the behavior of grain boundary, which controls the strength and fatigue of ceramic polycrystals, the properties of amorphous materials having similar structure to that of grain boundary were investigated. The following results were obtained: (1) The glass-forming regions were clarified for the systems containing rare-earth oxides being used for sintering aid, and furthermore their deformation and crystalline temperatures were determined. (2) Viscosity, density, hardness and thermal expansivity were determined for the amorphous materials in the <Si_3> <N-4> Si <O_2> -CaO system. (3) The amorphous materials obtained by RF-sputtering for the systems Ti <O_2> -Si <O_2> , Zr <O_2> -Si <O_2> and <A1_2> <O_3> -Si <O_2> were examined for their structure and properties, and some abnormal coordination states of cations were found. (4) The experimental ways to determine the chemical bond strength were established for multi-component glasses and the results were compared with the theoretical ones. (5) The effects of chemical composition, coordination number, crystallization, plastic deformation and inhomogeneity on elastic moduli and fracture toughness were examined based on the experimental data for glass and a possibility to increase the toughness was discussed.

为了清楚地控制陶瓷多晶的强度和疲劳的晶界的行为，研究了与晶界相似的无定形材料的特性。获得了以下结果：（1）阐明了含有用于烧结辅助的稀土氧化物的系统，并确定了它们的变形和结晶温度。 （2）确定<si_3> <n -4> si <o_2> -CAO系统中的无定形材料的粘度，密度，硬度和热膨胀性。 （3）通过对系统Ti <o_2> -Si <o_2>，Zr <o_2> -Si <O_2>和<A1_2> <o_3> -Si <o_2>的无形材料进行了检查，以发现其结构和特性，并发现了一些异常的c型状态。 （4）确定化学键强度的实验方法是针对多组分玻璃制定的，并将结果与​​理论上的结果进行了比较。 （5）根据玻璃的实验数据检查了化学组成，配位数，结晶，塑性变形和不均匀性对弹性模量和断裂韧性的影响，并讨论了增加韧性的可能性。

项目成果

Zairyo. 35-388. (1986)

扎里约。

J. Non-crystalline Solids. 73-1. (1985)

J. 非晶态固体。

J.Non-crystalline Solids. 73-1. (1985)

J.非晶态固体。

J.American Ceramic Society. 67-1. (1984)

J.美国陶瓷学会。

材料. 35-388. (1986)

材料。35-388。