助熔剂对原位转化炭纤维/氧化铝复合材料组织结构与性能的影响

以聚丙烯腈预氧化纤维为先驱体,氧化铝为主要原料,添加SiO2-MgO-CaO三系助熔剂,采用真空热压烧结法制备原位转化炭纤维增韧氧化铝陶瓷基复合材料.研究助熔剂对复合材料相结构、显微组织以及密度、硬度和断裂韧性的影响.结果表明：助熔剂的添加使复合材料在较低的烧结温度下便实现烧结,且提高复合材料的密度和力学性能.助熔剂在烧结过程中与氧化铝形成镁铝尖晶石等第二相,在晶界起钉扎效应,抑制氧化铝晶粒的长大,消除气孔,促进复合材料的致密化,改善炭纤维与基体间的界面结合强度,提高复合材料的韧性....

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Bibliographic Details
Published in材料工程 no. 12; pp. 54 - 58
Main Author 曹晶晶 陈华辉 杜飞 陈功哲
Format Journal Article
LanguageChinese
Published 中国矿业大学(北京)机电与信息工程学院材料科学与工程系,北京,100083 2013
Subjects
助熔剂
原位转化炭纤维
断裂韧性
界面
助熔剂
fracture toughness
原位转化炭纤维
sintering additive
in-situ transformed carbon fiber
界面
断裂韧性
interface
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Summary:以聚丙烯腈预氧化纤维为先驱体,氧化铝为主要原料,添加SiO2-MgO-CaO三系助熔剂,采用真空热压烧结法制备原位转化炭纤维增韧氧化铝陶瓷基复合材料.研究助熔剂对复合材料相结构、显微组织以及密度、硬度和断裂韧性的影响.结果表明：助熔剂的添加使复合材料在较低的烧结温度下便实现烧结,且提高复合材料的密度和力学性能.助熔剂在烧结过程中与氧化铝形成镁铝尖晶石等第二相,在晶界起钉扎效应,抑制氧化铝晶粒的长大,消除气孔,促进复合材料的致密化,改善炭纤维与基体间的界面结合强度,提高复合材料的韧性.
Bibliography:11-1800/TB
CAO Jing-jing,CHEN Hua-hui,DU Fei,CHEN Gong zhe （Department of Materials Science and Engineering,School of Mechanical Electronic ~ Information Engineering,China University of Mining g〉 Technology（Beijing）, Beijing 100083, China）
In-situ transformed carbon fibers toughened alumina composites were prepared by hot-press- ing sintering in vacuum, using pre-oxidized polyacrylonitrile fibers as the precursor and alumina as the main raw material, and by adding SiO2-MgO-CaO sintering additives. Effect of sintering additives on phase structure, microstructures, density, hardness and fracture toughness of the composites was studied. The results show that the composites can be densified at a relatively low temperature of 1650℃ via the liquid phases sintering mechanism and the density and mechanical properties of the composites increase with adding sintering additives. The sintering additives react with alumina to gen- erate spinel phase as pinning in the grain boundary and inhibit alumina grain growth. Furtherm
ISSN:1001-4381
1001-4381
DOI:10.3969/j.issn.1001-4381.2013.12.010