交联固化对碳化硅纤维耐热性能的影响  

Effect of crosslinking curing methods on the heat resistance of SiC Fibers

作　　者：张文礼[1,2] 李诚 刘伟华[1] 王谋华[1] 吴国忠[1,2] ZHANGWenli;LI Cheng;LIUWeihua;WANG Mouhua;WU Guozhong((Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院上海应用物理研究所,上海201800 [2]中国科学院大学,北京100049

出　　处：《辐射研究与辐射工艺学报》2020年第4期39-44,共6页Journal of Radiation Research and Radiation Processing

基　　金：科学挑战专题(TZ2018004);国家自然科学基金(11079048)资助。

摘　　要：以聚碳硅烷纤维作为先驱丝,分别通过纯氧化交联、氧化-热交联、电子束辐射交联进行固化处理,制备出了3种型号的碳化硅纤维。采用元素分析仪分析了3种碳化硅纤维的化学组成,使用万能拉力试验机、X射线衍射、扫描电镜等分析方法研究了它们的耐热性能。结果显示:采用纯氧化交联和氧化-热交联固化方法制备得到的纤维样品氧含量较高,初始力学强度达到2.8 GPa,但是耐热性约1200~1300℃;采用辐射交联固化方法制备得到的纤维氧含量仅有1%左右,能够在1500℃左右的高温中保持稳定结构。本研究说明,不改变原丝配方,仅通过改变固化方式可以大幅度提高碳化硅纤维的耐热性能。Three types of SiC fibers were prepared by polycarbosilane fibers using either pure solely oxidation curing method,an oxidation-thermal curing method,or electron beam radiation curing method.The chemical compositions of the three types of SiC fibers were analyzed using an element analyzer,and their heat resistance was studied using universal tensile testing machine;X-ray diffraction and scanning electron microscope were also employed for characterization.The results showed that the samples prepared by the solely oxidation and oxidationthermal curing methods had higher oxygen contents,and the initial mechanical strength of the samples reached 2.8 GPa;however,the heat resistance temperature was approximately 1200~1300°C;the oxygen content of SiC fibers prepared by the radiation crosslinking method was only approximately 1%,meaning that it was able to maintain a stable structure at a high temperature of 1500°C.This work showed that the heat resistance temperature of SiC fibers can be greatly improved by changing the curing mode,without changing the composition of the original preceramic polymers fiber.

关 键 词：先驱体法 碳化硅纤维 热处理 辐射交联 

分 类 号：TL13[核科学技术—核能科学]