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采用半导体激光器在45#钢基体上制备金刚石复合涂层,熔覆层材料为铁基粉末2Cr13和人造金刚石微粉的混合粉末,熔覆设备使用2kW光纤耦合半导体激光器。利用扫描电子显微镜(SEM)、能谱仪(EDS)、X射线衍射仪(XRD)对涂层的显微组织、元素分布和相结构进行分析;并采用摩擦磨损试验机对涂层的摩擦磨损性能进行了测试。结果表明:该复合涂层中的金刚石在激光的作用下发生了形态转变,一部分完全碳化形成石墨;另一部分不完全碳化形成石墨并残留小部分金刚石相。XRD分析涂层的相组成可知,该涂层主要由硬质相Fe0.64Ni0.36、金刚石、FexCy、过饱和固溶体Cr和石墨等组成。由于涂层中金刚石及石墨的存在,使得涂层具有优异的耐磨性能,涂层的耐磨性相比未添加金刚石涂层提高了近60%,涂层的磨损机制以磨粒磨损为主。
A semiconductor laser was used to prepare a diamond composite coating on a 45 # steel substrate. The cladding material was a mixed powder of iron-based powder 2Cr13 and artificial diamond powder, and cladding equipment used 2kW fiber-coupled semiconductor laser. The microstructure, elemental distribution and phase structure of the coating were analyzed by scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and X-ray diffractometer (XRD). The friction and wear of the coating Performance was tested. The results show that the diamond in the composite coating undergoes a morphological transformation under the action of a laser and partially carbonized to form graphite. The other part is incompletely carbonized to form graphite and a small part of diamond remains. XRD analysis of the coating phase composition shows that the coating is mainly composed of hard phase Fe0.64Ni0.36, diamond, FexCy, supersaturated solid solution Cr and graphite and other components. Due to the presence of diamond and graphite in the coating, the coating has excellent wear resistance. The wear resistance of the coating is increased by nearly 60% compared with that of the non-added diamond coating. The wear mechanism of the coating is mainly abrasive wear .