The Si-H reaction degree and homogeneity of the polycarbosilane PCS fibers were investigated with three types of cure furnaces including vertical,tunnel and side furnance.Results showed that the variability coefficient of PCS from side furnance was 66.4% lower than that from vertical,tunnel and side furnance.When PCS treated with side furnance,as the homogeneity increased,the oxygen content of PCS deceased,the oxygen content of Sic fiber was during 11.8% from 14.3%,with mechanical property to 2.3GPa.

Thermal curing process was adopted to improve traditional air-process to reduce the oxygen content of the continuous silican carbide fibers by leading oxygen as less as possible to the fibers during the curing treatment. The polycarbosilane fibers cured by thermal curing are sintered step by step. The condition of sintering process and the element composition, microstructure and properties of the fibers are studied in details by element analysis, SEM, EDX, XRD.

Thermal Curing process was adopted to improve the traditional air-process to lower the oxygen content of continuous silican carbide fibers by leading oxygen as little as possible to the fibers during their curing treatment. The influence of the thermal curing process on the oxygen content of the fibers, the structure and properties of fibers were systematically studied by means of IR, EA (Element Analyse), SEM and XRD.