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化工新型材料  2018, Vol. 46 Issue (10): 119-122    
  新材料与新技术 本期目录 | 过刊浏览 | 高级检索 |
辐射氧化法制备低含氧量碳化硅纤维 及耐温性能的研究
刘伟华,吴永龙,张文发,张文礼,李诚,吴国忠,王谋华*
中国科学院上海应用物理研究所,上海201800
SiC fiber obtained by radiation oxidation and study on the thermal stability
Liu Weihua, Wu Yonglong , Zhang Wenfa, Zhang Wenli, Li Cheng , Wu Guozhong , Wang Mouhua
Shanghai Institute of Applied Physics,Shanghai 201800
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摘要 采用辐射氧化联合热交联技术制备碳化硅(SiC)纤维,利用红外光谱研究辐照及热处理前后纤维的化学结构变化,并对它们及SiC纤维中的氧含量进行测定;采用强度变化评估SiC纤维的热稳定性,通过X射线衍射和扫描电镜等手段研究其微观结构变化。结果表明:辐射氧化主要引入了Si—OH活性基团,该基团在热交联过程中参与反应。SiC纤维中的氧含量可通过调节剂量得到控制,最低仅为6%,吸收剂量仅为200kGy;热稳定性与氧含量密切相关,氧含量降低,耐温性能得到提升,1400℃热处理后强度保留率为75%,1500℃处理后强度损失与晶粒增大及氧化物高温分解相关。
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刘伟华
吴永龙
张文发
张文礼
李诚
吴国忠
王谋华
关键词:  辐射氧化  热交联  SiC纤维  氧含量  耐温性能    
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.
Key words:  radiation oxidation    thermal crosslinking    SiC fiber    oxygen content    thermal stability
                    发布日期:  2018-11-06      期的出版日期:  2018-11-06
基金资助: 国家自然科学基金(11505268和11575279);上海市自然科学基金(15ZR1448600)
通讯作者:  王谋华。   
作者简介:  刘伟华(1986-),女,博士,助理研究员,主要从事高分子材料的辐照改性研究。
引用本文:    
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.
链接本文:  
http://www.hgxx.org/CN/  或          http://www.hgxx.org/CN/Y2018/V46/I10/119
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