High pressured processing of nano particle and whisker reinforced ceramic composites

纳米颗粒和晶须增强陶瓷复合材料的高压加工

• 批准号: 01420040
• 负责人: KISHI Teruo
• 金额: $ 24.06万
• 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 (A)
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01420040/
• 关键词: Ceramics; Ceramics composites; Hot press; Whisker; Facture toughness; ウィスカ-

(1) Alumina matrix composites which were reinforced by SiC and Y_2O_3 particles were produced by the hot press equipment. Mechanical parameters such as denstiy, grain size and so on were changed by controlling process temperature. We succeeded in producing Al_2O_3/SiC nano composite and Al_2O_3/SiC/YAG hybrid composite. (2) The generation of YAG as secondary phase found by X-ray deflection analysis. (3) Materials were densified by increasing of sintering temperature. Monolithic materials were fully desified over 1400ﾟC. Composites were fully desified between 1400ﾟC and 1600ﾟC. (4) Addition of SiC particles the grow of grain. Also the generation of YAG phase decreased the grain size of matrix. (5) Nano composites structure with dispensed SiC particles was clearly observed by transmission electron microscope. (6) Four point strength was increased by addition of SiC and Y_2O_3 because it decreased a grain size and increased relative density. Fracture toughness was improved in Al_2O_3/SiC/YAG composite by the increase of deflection in crack propagation. It was demonstrated that nano or hybrid composites could improve the mechanical properties of ceramics.

(1)通过控制工艺温度,改变密度、晶粒尺寸等力学参数,成功制备了SiC和Y_2O_3颗粒增强的氧化铝基复合材料。 (2)通过X射线偏转分析发现YAG作为第二相的生成。(3)通过材料致密化。烧结温度在1400℃以上时整体材料已完全硬化，而在1400℃至1600℃之间复合材料已完全硬化。 (4) SiC颗粒的添加也导致晶粒尺寸减小。 (5) 通过透射电子显微镜可以清晰地观察到分散有 SiC 颗粒的纳米复合材料结构。 (6) 添加 SiC 可以提高四点强度。 Y_2O_3可以减小晶粒尺寸并增加相对密度，从而通过增加裂纹扩展挠度来提高Al_2O_3/SiC/YAG复合材料的断裂韧性。结果表明，纳米或混合复合材料可以改善陶瓷的机械性能。

项目成果

M.Enoki: "Characterization of debonding process of fiber reinforced composites by acoustic emission" Nondestructive Testing and Evaluation. 9. 857-868 (1992)

M.Enoki：“通过声发射表征纤维增强复合材料的脱粘过程”无损检测和评估。

榎 学,岸 輝雄: "セラミックス基複合材料へのAEの適用" 非破壊検査. 41. 68-73 (1992)

Manabu Enoki、Teruo Kishi：“AE 在陶瓷基复合材料中的应用”无损检测 41. 68-73 (1992)。

M.Enoki,D.Valentin,H.Tsuda,T.Kishi: "Characterization of Debonding Process of Fiber Reinforced Conposites by Acoustic Emission" Nondestractive Testing and Evaluation. 8-9. 857-868 (1992)

M.Enoki，D.Valentin，H.Tsuda，T.Kishi：“通过声发射表征纤维增强复合材料的脱粘过程”无损测试和评估。

T.Hishi: "Brittle fracture and microcrack" Ceramics. 27. 311-315 (1992)

T.Hishi：“脆性断裂和微裂纹”陶瓷。

岸輝雄,志波光晴: "ミクロの傷を追う" 丸善, (1989)

岸辉雄、司波光晴：《追逐微小的伤口》丸善（1989）