论文部分内容阅读
通过机械合金化球磨方式制备Ti B2硬质相和Co粘结相质量比为3:1的Ti B2-25Ni金属陶瓷复合粉末,采用超音速火焰喷涂技术在Q235钢基体表面制备了3种不同氧气流量的Ti B2-25Ni涂层,通过扫描电子显微镜、X射线衍射表征涂层的微观组织形貌和物相结构,采用显微硬度计测量涂层硬度值,并对涂层的抗热震性能、耐熔融铝硅腐蚀性能和耐磨粒磨损性能进行研究。结果表明,3种涂层组织致密,呈典型的层状结构;涂层的主要物相均为Ti B2和Ni;3种涂层的显微硬度值分别为(408±87)HV0.3、(513±90)HV0.3和(553±77)HV0.3;经过热震试验发现,氧气流量为462 L/min的试样具有最佳的抗热震性能;经过60 h熔融铝硅腐蚀试验发现,3种涂层试样均具有良好的耐腐蚀性,其中以氧气流量为462 L/min的试样最佳。在磨粒磨损试验中发现,氧气流量为462 L/min的涂层试样的耐磨性比基体提高近6倍。
TiB2-25Ni cermet composite powder with TiB2 hard phase and Co binder phase mass ratio of 3: 1 was prepared by mechanical alloying and ball milling. Three kinds of oxygen gas were prepared on the surface of Q235 steel substrate by supersonic flame spraying Flow rate of Ti B2-25Ni coating by scanning electron microscopy, X-ray diffraction characterization of the coating microstructure and phase structure, the use of micro-hardness tester to measure the hardness of the coating, and the coating thermal shock resistance , Corrosion resistance of molten aluminum silicon and abrasion resistance of abrasive grains were studied. The results show that the three coatings are dense and have a typical layered structure. The main phases of the coatings are Ti B2 and Ni. The microhardness values of the three coatings are (408 ± 87) HV0.3, (513 ± 90) HV0.3 and (553 ± 77) HV0.3. After thermal shock test, the sample with 462 L / min oxygen flow has the best thermal shock resistance. After 60 h molten aluminum silicon corrosion The test found that all three kinds of coating samples have good corrosion resistance, of which the best oxygen flow rate of 462 L / min sample. Abrasive wear test found that the oxygen flow rate of 462 L / min coating sample wear resistance than the matrix increased nearly 6 times.