活性填料在先驱体转化法纤维增强陶瓷基复合材料中的应用Ⅰ .复合材料的致密化模型  

APPLICATION OF ACTIVE FILLER IN PREPARATION OF FIBER REINFORCED CERAMIC MATRIX COMPOSITES BY POLYMER-INFILTRATION-PYROLYSIS Ⅰ.DENSIFICATION MODELS

作　　者：谢征芳[1] 陈朝辉[1] 肖加余[1] 

机构地区：[1]国防科技大学航天与材料工程学院,长沙410073

出　　处：《复合材料学报》2002年第6期37-42,共6页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金资助项目(59682009)

摘　　要：　在先驱体转化陶瓷基复合材料的制备中,坯体在裂解前后的体积发生变化。引入体系体积收缩率参数,对单一先驱体转化纤维增强陶瓷基复合材料致密化模型进行了修正。同时,分别对含惰性填料和/或活性填料的先驱体浆料浸渍-裂解纤维增强陶瓷基复合材料致密化进行了模型分析。从理论上揭示了复合材料的浸渍-裂解周期与材料的理论密度和理论孔隙率之间的关系。当先驱体浆料中含有活性填料时,复合材料的理论密度和理论孔隙率与活性填料的反应陶瓷产率、反应密度比、体积收缩率有密切的数学关系。在先驱体中引入活性填料比引入惰性填料能更为有效地提高材料的密度,降低材料的孔隙率。In the preparation of fiber reinforced ceramic matrix composites (FRCMCs) by polymerinfiltrationpyrolysis (PIP), the volume of the composites would change during the conversion of the preceramic polymer into a ceramic matrix in the first pyrolysis process. The repetition cycledensity densification model is revised by introducing the volume shrinkage percentage of the composites. The densification models for the FRCMCs preparation by active filler and/or inert fillercontaining preceramic polymerinfiltrationpyrolysis are also developed. The relationships between the theoretical density and porosity of the composites and the repetition cycle are discovered. For the active fillercontaining system, the theoretical density not only relates with the ceramic yield of the polymer and the density ratio between the pyrolysis product and polymer, but also relates with the reaction yield and density ratio of the active filler after reaction, and the volume shrinkage of the composite. It is proved that the addition of the active filler is more effective than that of the inert filler for the composite densification. 

关 键 词：纤维增强陶瓷基复合材料 先驱体转化法 活性填料 惰性填料 致密化模型 

分 类 号：TB332[一般工业技术—材料科学与工程]