网络互穿型碳化硅陶瓷/铁基复合材料制备及其耐磨性能

通过酚醛树脂固化、碳化及原位硅化的技术制备复杂形状SiC陶瓷,并利用金属浇注工艺制备出了以高锰钢、高铬铸铁为基体的2种网络互穿型SiC陶瓷/金属复合材料。借助湿式橡胶轮摩擦磨损试验机和UMT-3多功能摩擦磨损试验机测试该2种复合材料及2种基体的摩擦学性能,并采用扫描电子显微镜分析了复合材料和基体磨损后的表面形貌。结果表明：由于SiC陶瓷体的强度、硬度比金属基体高,导致在磨损过程中2种基体材料的磨损量较大,且在复合材料表面形成微凸起,使得复合材料的耐磨性能明显提高;SiC陶瓷/高铬铸铁复合材料的耐磨性优于SiC陶瓷/高锰钢复合材料,但SiC陶瓷/高锰钢复合材料的界面结合更好。

Preparation and Wear Resistance of SiC/Fe Composites with Interpenetrating Structure

SiC ceramic with the complex shape was prepared via the curing of phenol–formaldehyde resin, carbonization and in-situ siliconization. Two kinds of interpenetrating SiC/metal (i.e., high manganese steel and high chromium cast iron) composites were fabricated by metal casting. The tribological properties of the two composites were investigated by a wet rubber wheel grinding friction tester and a UMT-3 multi-specimen test system. The surface morphologies of the two composites and the two metal matrices after abrasion were analyzed by scanning electron microscopy. The wear loss of the metal matrices was more than those of the respective composites. The micro-protrudes formed on the surfaces due to the addition of SiC ceramic, which has a higher strength and hardness, compared to the metal matrices. As a result, the wear resistances of the two composites were improved. The wear resistance of the SiC/iron composite was higher than that of the SiC/steel composite. However, the SiC/steel composite displayed a better interfacial bonding.