摘要
以Fe-Cr-C合金粉末为原料,采用等离子熔覆技术,在调质C级钢表面制得以原位生成初生相Cr7C3为增强相的新型陶瓷复合材料涂层。利用光子显微镜(OM),扫描电镜(SEM),X射线衍射(XRD)和能量色散谱(EDS)等分析了涂层的显微组织,并在室温干滑动磨损及二体磨料磨损条件下测试了该涂层的耐磨性能。结果表明,涂层组织包括Cr7C3增强相和γ-Fe固溶体与少量Cr7C3构成的共晶;由于Cr7C3/γ-Fe快速凝固复合材料涂层组织细小、均匀,在滑动磨损过程中不易与对偶件黏着、在磨料磨损过程中具有很高的抗切削抗剥落能力,因而在干滑动磨损及二体磨料磨损条件下涂层均具有优良的耐磨性能。
A neotype cermet composite coating containing in-situ Cr_7 C_3 reinforcing phase was fabricated on C-grade steel substrate via plasma cladding, using the mixed powders of Fe-Cr-C as the raw materials. The microstructure of the cermet composite coating was analyzed by means of optical microscopy, scanning electron microscopy, X-ray diffraction, and energy dispersive spectroscopy. The wear resistance of the cermet composite coating at room and elevated temperatures was evaluated under dry sliding condition and abrasive wear condition, respectively. The results indicated that the plasma cladded cermet composite coating was composed of rapidly solidified primary phase of Cr_7 C_3 and eutectics of Cr_7 C_3 /γ-Fe, and was metallurgically bonded to the C-grade steel substrate. The composite coating had excellent wear resistance under dry sliding and pin-on-disk abrasive wear conditions as well, which could be attributed to the unique combination of high strength and ductility of the Cr_7 C_3 reinforcing phase and the high hardness and strong atomic bonds of the γ-Fe matrix.
出处
《材料保护》
CAS
CSCD
北大核心
2006年第11期6-8,13,共4页
Materials Protection
