A new SiC fiber was prepared by the pyrolysis of polycarbosilane(PCS) fiber cured with unsaturated hydrocarbons.The fiber,with oxygen content of 4-6 wt%,offers high tensile strength of 2.5-2.8 GPa.The electrical resis...A new SiC fiber was prepared by the pyrolysis of polycarbosilane(PCS) fiber cured with unsaturated hydrocarbons.The fiber,with oxygen content of 4-6 wt%,offers high tensile strength of 2.5-2.8 GPa.The electrical resistivity of the fiber is only about 0.5 Ω·cm,much lower than general SiC fiber obtained from traditional air curing process.Degradation of mechanical property in argon and air at high temperature is retarded by 200-300℃ with respect to the Nicalon NL-202 fiber.The low electrical resistivity of the fiber exhibits excellent thermal stability,it almost remains 0.4-0.8 Ω·cm after thermal exposure test from the room temperature to 1600℃ in argon.The low electrical resistivity mainly attribute to an excess carbon layer which is about 50 nm in the circular outer part.展开更多
论述了强激光与材料的相互作用 ,热破坏因素要求材料具有高的反射率和良好的烧蚀性能 ,冲量破坏要求材料具有高的断裂强度。以 Si C为代表的精细陶瓷材料 ,有着其它材料无可媲美的性能。聚碳硅烷是一种可转化为无机体的有机聚合物树脂 ,...论述了强激光与材料的相互作用 ,热破坏因素要求材料具有高的反射率和良好的烧蚀性能 ,冲量破坏要求材料具有高的断裂强度。以 Si C为代表的精细陶瓷材料 ,有着其它材料无可媲美的性能。聚碳硅烷是一种可转化为无机体的有机聚合物树脂 ,与 Si C粉末混合后采用冷等静压成型方法 ,制成 Si C精细陶瓷体 ,作为抗激光加固材料 ,其可行性研究给出满意的结果。展开更多
文摘A new SiC fiber was prepared by the pyrolysis of polycarbosilane(PCS) fiber cured with unsaturated hydrocarbons.The fiber,with oxygen content of 4-6 wt%,offers high tensile strength of 2.5-2.8 GPa.The electrical resistivity of the fiber is only about 0.5 Ω·cm,much lower than general SiC fiber obtained from traditional air curing process.Degradation of mechanical property in argon and air at high temperature is retarded by 200-300℃ with respect to the Nicalon NL-202 fiber.The low electrical resistivity of the fiber exhibits excellent thermal stability,it almost remains 0.4-0.8 Ω·cm after thermal exposure test from the room temperature to 1600℃ in argon.The low electrical resistivity mainly attribute to an excess carbon layer which is about 50 nm in the circular outer part.
文摘论述了强激光与材料的相互作用 ,热破坏因素要求材料具有高的反射率和良好的烧蚀性能 ,冲量破坏要求材料具有高的断裂强度。以 Si C为代表的精细陶瓷材料 ,有着其它材料无可媲美的性能。聚碳硅烷是一种可转化为无机体的有机聚合物树脂 ,与 Si C粉末混合后采用冷等静压成型方法 ,制成 Si C精细陶瓷体 ,作为抗激光加固材料 ,其可行性研究给出满意的结果。
