Si-B-N透波纤维的耐超高温性能  

Ultra-high temperature resistance properties of Si-B-N wave-transparent fibers

作　　者：陈志彦[1] 唐云[2] CHEN Zhiyan TANG Yun(School of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China State Key Laboratory of New Ceramic Fibers and Composites, College of Aerospace ＆ Materials Engineering, National University of Defense Technology, Changsha 410073, China)

机构地区：[1]中南林业科技大学材料科学与工程学院,长沙410004 [2]国防科技大学航天与材料工程学院,新型陶瓷纤维及其复合材料重点实验室,长沙410073

出　　处：《复合材料学报》2016年第9期2088-2093,共6页Acta Materiae Compositae Sinica

基　　金：湖南省生物质复合材料重点实验室开放基金(16K102);木竹资源高效利用湖南省2011协同创新中心

摘　　要：以聚硼硅氮烷（PBSZ）为先驱体,经熔融纺丝、不熔化以及在氨气气氛中高温裂解制备了Si-B-N纤维,然后在高纯氮气保护下加热至超高温。利用元素分析、FTIR、XRD、SEM、力学性能分析和波导法等研究了纤维的耐超高温性能。结果表明：Si-B-N纤维1 500℃退火几乎不失重,在惰性气体中非晶状态可以保持至1 700℃,加热到1 850℃才形成Si3N4和BN等结晶相;Si-B-N纤维的拉伸强度为1.72GPa,弹性模量为196GPa,1 500℃退火Si-B-N纤维的拉伸强度为1.86GPa,弹性模量为205GPa,Si-B-N纤维具有很好的耐超高温性能;此外,采用波导法测量,Si-B-N纤维表现出优良的介电性能,测试频率为8～12GHz,1 400℃退火的Si-B-N纤维平均介电常数和介电损耗角正切值分别为约3.68和0.001 1。Si-B-N fibers were prepared by melt-spinning,curing and pyrolysis under high temperature of a precursor polyborosilazane（PBSZ）under NH3 atmosphere,then the fibers were heated up to ultra-high temperature under purity N2.The ultra-high temperature resistance property of the fibers was researched by elemental analysis,FTIR,XRD,SEM,mechanical properties analysis and wave-guide methods.The results show that the weight of Si-B-N fibers lose little annealed at 1 500 ℃,the fibers can remain amorphous up to 1 700 ℃ in inert atmospheres,and a mixture of Si3N4 and BN crystalline phases are observed upon heating to 1 850 ℃;average tensile strength and average elastic modulus of Si-B-N fibers are 1.72 GPa and 196 GPa at room temperature respectively,and they are 1.86 GPa and 205 GPa annealed at 1 500℃,respectively.So the fibers exhibit excellent ultra-high temperature resistance property.In addition,the Si-B-N fibers show good dielectric properties according to the measurement by a waveguide method,average dielectric constant and dielectric loss tangent of the Si-B-N fibers annealed at 1 400 ℃ are about 3.68 and 0.001 1in 8-12 GHz,respectively.

关 键 词：Si-B-N陶瓷纤维 先驱体转化法 耐超高温 力学性能 透波性能 

分 类 号：TQ343[化学工程—化纤工业]