Structural Design and processing of Laminated Fiber-reinforced Ceramic Matrix Composites

层状纤维增强陶瓷基复合材料的结构设计与加工

• 批准号: 07555482
• 负责人: HIRATA Yoshihiro
• 金额: $ 3.14万
• 依托单位: Kagoshima University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555482/
• 关键词: Si-Ti-C-O fiber; Mullite; Laminated Composites; Hot-pressing; Microstructure; Mechanical Properties; Polytitanocarbosilane; ポリチタノカルボシラン; コンプライアンス; 一軸配向; 平織り; 内部応力; 有限要素法; 破壊; き裂; 透過電子顕微鏡; 析出物; コロイドプロセッシング; 長繊維織物; 炭化ケイ素; 非線形破壊; 残留応力

A sol-gel-processed mullite powder and Si-Ti-C-O fiber woven fabrics were formed into laminated composites by filtration or doctor blade method using aqueous mullite suspensions containing polyacrylic ammonium and methyl cellulose at pH 8.5. The laminate green composites with 6 and 10 vol% fabrics were hot-pressed to near full density at 1500ﾟ-1650ﾟC for 1h under a pressure of 39 MPa in a N2 atmosphere. Graphite layrs of about 10 nm thickness and TiC particles of 0.1-0.2 mum were produced at the interfaces between fibers and matrix after hot-pressing at 1650ﾟC.beta-SiC and TiC particles of 10-30 nm and graphite phase with short cycle structure were recognized in the fibers. These results indicate that the crystallization of fibers progresses with formation of the amorphous phase in fiber. The EDS quantification of the fibers indicated that the fibers pyrolyzed during hot-pressing at 1650ﾟC by 13.7 % of oxygen content.A linear relation of stress-displacement in fracture behavior of monolithic mullite changed to a non-linear relation in the composites with 10-30 vol% of Si-Ti-C-O fabrics and hot-pressed at 1650ﾟC.Addition of Si-Ti-C-O fabrics decreased the four point flexural strength of monolithic mullite (328 MPa) to 292 MPa at 6 vol%, 271 MPa at 10 vol% and 59-78 MPa at 20-30 vol% of fabrice. The decrease of flexural strength for the composite was due to the residual tensile stress caused in the mullite layrs along the direction of length of composites. It is important to study fracture behavior of composite under multiaxial stress state for structural components in practical applications. The tension-compression biaxial strengh of composite materials was lower than that of monolithic mullite ceramics.

将溶胶-凝胶处理的莫来石粉末和Si-Ti-C-O纤维机织织物通过过滤或刮刀法使用含有聚丙烯酸铵和甲基纤维素的莫来石水悬浮液在pH 8.5下形成层压复合材料，其中层压材料为pH 6和10。 vol% 织物在 1500°-1650°C 下热压至接近全密度1650℃热压后，在39MPa压力下保温1h，纤维与基体界面处生成厚度约10nm的石墨层和0.1-0.2μm的TiC颗粒。在纤维中发现了10-30 nm的TiC颗粒和具有短周期结构的石墨相，这些结果表明纤维的结晶化进展。纤维中非晶相的形成表明，纤维在 1650°C 热压过程中热解，氧含量为 13.7%。整体莫来石断裂行为中应力-位移的线性关系变为10-30 vol% Si-Ti-C-O 织物热压复合材料中的非线性关系1650℃。添加Si-Ti-C-O织物使整体莫来石的四点弯曲强度(328 MPa)降低至6 vol%时的292 MPa、10 vol%时的271 MPa和20-30 vol%时的59-78 MPa复合材料弯曲强度的下降是由于莫来石中产生的残余拉应力造成的。复合材料的拉压双轴强度低于整体莫来石陶瓷，研究复合材料在多轴应力状态下的断裂行为具有重要意义。

项目成果

Yukihiro Kyoden: "Processing and Fracture Behavior of Laminated Si-Ti-C-O Fibers/Mullite Matrix Composites" Proceedings of the 6th International Symposium on Ceramic Materials & Components for Engines. (印刷中). (1997)

Yukihiro Kyoden：“层压 Si-Ti-C-O 纤维/莫来石基复合材料的加工和断裂行为”第六届国际发动机陶瓷材料与部件研讨会论文集（1997 年）。

Tsuyoshi Matsura: "Synthesis and Microstructure of Polytitanocarbosilane/Mullite Matrix Composite" Processings of the 6th Tohwa University International Symposium,Frontier Nanostructured Ceramics. 177-181 (1996)

Tsuyoshi Matsura：“聚钛碳硅烷/莫来石基复合材料的合成和微观结构”第六届东和大学国际研讨会加工，纳米结构陶瓷前沿。

Yoshihiro Hirata: "Colloidal Processing" Processing of the 8th CIMTEC-World Ceramics Congress & Forum on New Materials,Advances in Science and Technology. 3C. 1533-1544 (1995)

平田义博：第八届CIMTEC-世界陶瓷大会的“胶体加工”加工

Y.Hirata: "Colloidal processing Proceedings of the 8th CIMTEC-World Ceramics Congress & Forum on New Materials" Proceedings of the 8th CIMTEC-World Ceramics Congress & Forum on New Materials Advances in science and Technology. 3C. 1533-1544 (1995)

Y.Hirata：《第八届 CIMTEC-世界陶瓷大会胶体加工论文集》

Y.Kyoden: "Processing and Fracture Behavior of Laminated Si-Ti-C-O Fibers/Mullite Matrix Composites" Proceedins of the 6th International symposium on Ceramic Materials & Composites for Engines. 788-791 (1997)

Y.Kyoden：“层状Si-Ti-C-O纤维/莫来石基复合材料的加工与断裂行为”第六届国际陶瓷材料研讨会论文集