【摘要】 以SiC纳米纤维作为增强体,采用凝胶注模成型工艺制备碳化硅陶瓷坯体,通过反应烧结制备SiC纳米纤维增强碳化硅陶瓷基复合材料;采用两种不同粒径的碳化硅粉体为原料,加入不同质量分数的SiC纳米纤维,通过丙烯酰胺聚合体系制备素坯,坯体经干燥、脱胶后渗硅烧结得到复合陶瓷。利用万能试验机和扫描电镜分析碳化硅陶瓷力学性能及显微结构。结果表明:SiC纳米纤维的加入有助于复合陶瓷力学性能的提高;SiC纳米纤维含量为12 wt%,复合陶瓷抗弯强度为267 MPa,与未加SiC纳米纤维相比提高28%。更多还原

【Abstract】 Silicon carbide ceramics body was prepared by gel-casting technology. Then, silicon carbide ceramic matrix composites reinforced by SiC nanofibers were prepared through reactive sintering. Silicon carbide biscuit was prepared with polymerization of acrylamide system by using SiC powder with two different sizes as raw material and adding different mass fraction of SiC nanofibers. The composite ceramics was obtained by drying, degumming and reactive sintering. mechanical properties and microstructure of silicon carbide ceramics were analyzed by universal tester and scanning electron microscope. The results showed that the addition of SiC nanofibers could improve the mechanical properties of composite ceramics. When the content of SiC nanofibers was 12 wt%, the bending strength of composite ceramics was 267 MPa, 28% higher than that without SiC nanofibers.更多还原