Processing of SiC whisker-reinforced mullite ceramic composites

SiC晶须增强莫来石陶瓷复合材料的加工

• 批准号: 03650628
• 负责人: ASHIZUKA Masahiro
• 金额: $ 1.15万
• 依托单位: Kyushu Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03650628/
• 关键词: Mullite; SiC whisker; Ceramic composite; Dispersion; Flexural strength; Fracture toughness; High toughening mechanism; Load transfer mechanism; 分散剤; 炭化ケイ素ウィスカ-; ゼ-タ電位; 沈降実験; 等電点; 強度

(1) Dispersion of ceramic powder and SiC whisker in slurryDispersion behavior of mullite and SiC whisker in slurry was evaluated by the measurement of zeta potential in aqueous solution and sedimentation velocity in aqueous solution and ethanol. Good dispersion state for mullite was obtained in aqueous solution adjusted above pH=9 and in ethanol. On the other hand, dispersion for SiC whisker was improved only by addition of deflocculant.(2) Relation between powder mixing and slurry drying processes and microstructure of ceramic compositesThe effects of mixing and drying methods to density, microstructure and flexural strength was studied. Ceramic composites of high density and high strength was obtained by the combination of powder-mixing in ethanol containing deflocculant by ball-milling and drying by rotary-evaporator(3) Flexural strength and fracture toughnessThe effects of whisker diameter and carbon-coating to whisker on the flexural strength and fracture toughness of SiC whisker-reinforced mullite were studied. The flexural strength and fracture toughness increased with increasing SiC whisker contents. The flexural strength and fracture toughness were little affected by changing whisker diameter. The flexural strength slightly decreased by coating whisker with carbon. It is concluded that the toughening mechanism of SiC whisker-reinforced mullite is in load transfer to whisker.

(1)陶瓷粉体和SiC晶须在料浆中的分散通过测定莫来石和SiC晶须在水溶液中的zeta电位、在水溶液和乙醇中的沉降速度，评价了它们在料浆中的分散行为。莫来石在pH=9以上的水溶液和乙醇中均能获得良好的分散状态。另一方面，SiC晶须的分散性仅通过加入抗絮凝剂来改善。(2)研究了粉体混合和浆料干燥工艺对陶瓷复合材料的密度、显微结构和抗弯强度的影响。（3）抗弯强度和断裂韧性研究了晶须直径、晶须表面包覆碳对SiC晶须增强莫来石抗弯强度和断裂韧性的影响。随着SiC晶须含量的增加，复合材料的抗弯强度和断裂韧性增加。晶须直径对复合材料的弯曲强度和断裂韧性影响不大。晶须表面包覆碳后，弯曲强度略有下降。结果表明，SiC晶须增强莫来石的增韧机理是向晶须传递载荷。

项目成果

芦塚 正博 青柳 勇: "炭化ケイ素ウイスカー強化ムライト複合材料の機械的性質" 日本セラミックス協会学術論文誌.

Masahiro Ashizuka 和 Isamu Aoyagi：“碳化硅晶须增强莫来石复合材料的机械性能”日本陶瓷学会杂志。

M.Ashizuka,M.Kamiyoshikawa: "Mechanical Properties of SiC Whisker-Reinforced Glass Ceramic Composites(Part2)" Journal of the Ceramic Society of Japan. 100. 541-548 (1992)

M.Ashizuka，M.Kamiyoshikawa：“SiC晶须增强玻璃陶瓷复合材料的机械性能（第2部分）”日本陶瓷学会杂志。

M. Ashizuka and I. Aoyagi: "Mechanical properties of SiC whisker-reinforced mullite ceramic composites (in preparation)" Journal of the Ceramic Society of Japan.

M. Ashizuka 和 I. Aoyagi：“SiC 晶须增强莫来石陶瓷复合材料的机械性能（准备中）”日本陶瓷学会杂志。

M. Ashizuka and M. Kamiyosikawa: "Mechanical properties of SiC whisker-reinforced glass ceramic composites (Part 2)" Journal of the Ceramic Society of Japan. 100. 541-548 (1992)

M. Ashizuka 和 M. Kamiyosikawa：“SiC 晶须增强玻璃陶瓷复合材料的机械性能（第 2 部分）”日本陶瓷学会杂志。

Masahiro ASHIZUKA,Makoto KAMIYOSHIKAWA: "Mechanical Properties of SiC WhiskerーReinforced Glass Ceramic Compositers(Part 2)" Journal of the Ceramic Society of Japan. 100. (1992)

Masahiro ASHIZUKA、Makoto KAMIYOSHIKAWA：“SiC 晶须增强玻璃陶瓷复合材料的机械性能（第 2 部分）”日本陶瓷学会杂志 100。（1992 年）。