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.

为了弄清控制多晶陶瓷强度和疲劳的晶界行为，研究了与晶界结构相似的非晶材料的性能。（1）明确了稀土氧化物助烧体系的玻璃形成区域，并测定了其变形温度和析晶温度。(2)测定了Si-CaO系非晶材料的粘度、密度、硬度和热膨胀系数<Si_3><N-4><O_2>. (3)研究了Ti<O_2>-Si<O_2>、Zr<O_2>-Si<O_2>和<A1_2><O_3>-Si<O_2>系统的非晶材料的结构和性能，发现了一些异常的阳离子配位状态。（4）建立了测定多组分玻璃化学键强度的实验方法，并与理论结果进行了比较。(5)根据玻璃的实验数据，考察了化学成分、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，并讨论了提高玻璃韧性的可能性。

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. 33-374. (1984)

材料。33-374。