纤维涂层处理SiC_f/SiC复合材料

The SiC_f/SiC Composites Manufactured by Continuous SiC Fibers with Coatings

分别采用酚醛和沥青为先驱体,在连续SiC纤维表面进行涂层制备,采用SEM、表面能谱等分析手段系统研究了涂层组成、结构及其对SiC纤维力学性能的影响。以含碳涂层的SiC纤维和聚碳硅烷(PCS)为原料通过先驱体转化法(PIP)制备SiC_f/SiC复合材料,对其微观结构及性能进行了表征。结果表明,经过涂层处理后,在连续SiC纤维表面涂敷了一层无定形碳,纤维表面缺陷得到改善,抗拉强度有所提高。采用碳涂层SiC纤维制备SiC_f/SiC复合材料后,断裂韧性明显提高。通过涂层处理有效地改善了SiC_f/SiC复合材料的韧性。

The carbon was coated onto continuous SiC fibers by PIP process using the batelite and pitch, and composites; microstructure and the mechanical properties were studied by SEM, EDS and tensile testing. The SiCf/SiC composites with the carbon coating continuous SiC fibers and PCS were manufactured. The results show the defect and the tensile strength of SiC fibers surface with the carbon coating are improved, the fracture toughness of the SiC f/SiC composites prepared using SiC fibers with the carbon coating is enhanced obviously.