Abstract: Sillicon carbide fibers were prepared from polycarbosilane(PCS) fibers by radiation oxidation & thermal curing technique.The chemical structure of PCS fibers after radiation oxidation and thermal curing process was studied using FT-IR,and the oxygen content of all the fibers was determined.The thermal stability of SiC fiber was evaluated via the loss of strength and the microstructure changes was shown using XRD and SEM.It was found that Si—OH was introduced onto PCS fibers molecular chains by radiation oxidation and then consumed in thermal curing reaction.The oxygen content of SiC fibers with a minimum of 6% at 200kGy could be controlled by adjusting dose.Thermal stability of SiC fiber was closely related to oxygen content and the retention rate of strength at 1400℃ was 75% for SiC fibers with lower oxygen content.The strength loss at 1500℃ was found to be related to crystal growth and decomposition of oxidation product.
刘伟华,吴永龙,张文发,张文礼,李诚,吴国忠,王谋华. 辐射氧化法制备低含氧量碳化硅纤维 及耐温性能的研究[J]. 化工新型材料, 2018, 46(10): 119-122.
Liu Weihua,Wu Yonglong,Zhang Wenfa,Zhang Wenli,Li Cheng,Wu Guozhong,Wang Mouhua. SiC fiber obtained by radiation oxidation and study on the thermal stability. New Chemical Materials, 2018, 46(10): 119-122.
[1] 林智群,雷永鹏.碳化硅陶瓷纤维的性能及其在航空航天领域的应用[J].飞航导弹,2008(2):55-57,64. [2] Yajima S,Hayashi J,Omori M.Continuous silicon-carbide fiber of high tensile strength[J].Chemistry Letters,1975,4:931-934. [3] Shin D G.Thermal oxidation curing of polycarbosilane for SiOC fiber process[J].Asian Journal of Chemistry,2014,26:4121-4124. [4] Ichikawa H.Development of high performance SIC fibers derived from polybosilane ssing electron beam irradiation curing-a review[J].Journal of the Ceramic Society of Japan,2006,114(1330):455-460. [5] 叶泽文,王谋华,吴国忠.低剂量γ射线辐射氧化法制备SiC纤维研究[J].化工新型材料,2014,42(3):60-62,65. [6] 黎阳,许云书,徐光亮,等.空气中γ射线辐照聚碳硅烷陶瓷先驱丝热解合成SiC纤维[J].核化学与放射化学,2007,29(3):166-170. [7] 戚英娜,王谋华,宋永才,等.聚碳硅烷纤维的辐照氧化联合热处理研究[J].化工新型材料,2011,39(10):85-87. [8] 童林剑,苏智明,龚朝阳,等.含氧气氛下电子束辐照聚碳硅烷制备碳化硅纤维[J].硅酸盐学报,2009,37(7):1160-1164. [9] Li H B,Zhang L T,Cheng L F,et al.Effect of the polycarbosilane structure on its final ceramic yield[J].Journal of the European Ceramic Society,2008,28(4):887-891. [10] Schmidt W R,Interrante L V,Doremus R H,et al.Pyrolysis chemistry of an organometallic precursor to silicon-carbide[J].Chemistry of Materials,1991,3(2):257-267. [11] Shimoo T,Okamura K,Mutoh W.Oxidation behavior and mechanical properties of low-oxygen SiC fibers prepared by vacuum heat-treatment of electron-beam-cured poly(carbosilane) precursor[J].Journal of Material Science,2003,38:1653-1660. [12] Shimoo T,Okamura K,Tsukada I,et al.Thermal stability of low-oxygen SiC fibers fired under different conditions[J].Journal of Materials Science,1999,34(22):5623-5631.