具备吸收雷达波功能的三叶型碳化硅纤维研制

PREPARATION OF TRILOBAL SiC FIBERS WITH RADAR-ABSORBING PROPERTIES

以聚碳硅烷 (PCS)为原料 ,采用熔融纺丝制备三叶型 PCS纤维后 ,经不熔化和烧成制得三叶型碳化硅纤维。研究了纺丝温度、收丝速度等对纤维异形度的影响 ,并对预氧化和烧成工艺以及吸波性能等进行了研究。研究表明 ,较低的纺丝温度、适当高的纺丝压力和较低的转速有利于提高纤维的异形度。与相同当量直径的圆形纤维相比 ,三叶型碳化硅纤维的抗拉强度平均提高约 30 % ,三叶型碳化硅纤维在 8～

Trilobal polycarbosilane(PCS) fibers were prepared by melt spinning PCS precursor through Y shaped spinneret. Then, after curing in air and heat treatment under N 2 atmosphere, trilobal silicon carbide fibers were manufactured. The effect of spinning temperature and velocity on the fibers degree of profile was analyzed. Preparation conditions such as curing, heat treatment and microwave absorbing properties were also studied. Compared with circular SiC fibers, the fiber exhibits higher mechanical properties and microwave absorbing properties. The structural radar absorbing materials, composed of the fibers with resin, exhibit a reflection attenuation amount of 10~20 dB in the range of 8~18 GHz.