CAJ | 학술논문

采用不饱和烃不熔化处理后的聚碳硅烷(PCS)纤维经高温烧成可制得一种新型的SiC纤维,纤维的抗张强度达2.5～2.8GPa,氧含量4wt%～6wt%,电阻率仅为0.5Ω·cm左右,大大低于采用传统空气不熔化方法得到的SiC纤维.研究表明:该纤维表面存在厚度约50nm的富碳层,并且在Ar气中进行高温热处理后,表面富碳层结构无明显变化.与日本通用级SiC纤维Nicalon NL202 相比,纤维的耐热性提高200～300℃.纤维具有低电阻率稳定性,从室温到1600℃,其电阻率始终保持在0.4～0.8Ω·cm.
채용불포화경불용화처리후적취탄규완(PCS)섬유경고온소성가제득일충신형적SiC섬유,섬유적항장강도체2.5～2.8GPa,양함량4wt%～6wt%,전조솔부위0.5Ω·cm좌우,대대저우채용전통공기불용화방법득도적SiC섬유.연구표명:해섬유표면존재후도약50nm적부탄층,병차재Ar기중진행고온열처리후,표면부탄층결구무명현변화.여일본통용급SiC섬유Nicalon NL202 상비,섬유적내열성제고200～300℃.섬유구유저전조솔은정성,종실온도1600℃,기전조솔시종보지재0.4～0.8Ω·cm.
A new SiC fiber was prepared by the pyrolysis of polycarbosilane (PCS) fiber cured with unsaturated hydrocarbons. The fiber with oxygen content of 4wt%-6wt%, has high tensile strength of 2.5-2.8GPa. The specific resistance of the fiber is only about 0.5Ω·cm, which is much lower than general SiC fiber obtained from traditional air curing process. Results show that the fiber has an excess carbon layer with a thickness of about 50nm in the circular outer part, and the layer changes little after thermal exposure in argon. Compared with the ceramic grade fiber Nicalon NL202, thermal resistance to degradation of the fiber's mechanical property is improved by 200-300℃. The low specific resistance of the fiber also exhibits excellent thermal stability, which almost remains at 0.4-0.8Ω·cm after thermal exposure test from the room temperature to 1600℃ in argon.