作　　者： ; ; ; ; (范亚乔）; (关晓晓）;

机构地区： 九江市绿色再制造重点实验室

出　　处： 《材料热处理学报》 2014年第S2期185-192,共8页

摘　　要： 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。 Ti B2-25 Ni cermet composite particles with the mass ratio of 3: 1 for Ti B2 ceramic phase and Ni binder phase were fabricated by mechanical alloying,three kinds of Ti B2-25 Ni coatings were fabricated on Q235 steel by high velocity oxygen fuel( HVOF) method with spraying processing of different oxygen flow rates. The microstructure and phase compositions of the coatings were analyzed by scanning electron microscope( SEM) and X-ray diffraction( XRD),respectively. The microhardness of the coatings was measured by HVS-1000,and the properties of thermal shock resistance,corrosion resistance and abrasive wear resistance of the molten Al-12. 07% Si alloy were studied. The results show that three kinds of coatings exhibit dense microstructure and layer structure,the main phases of the coatings are Ti B2 and Ni. The microhardness of the coatings is( 408 ± 87) HV0. 3、( 513 ± 90) HV0. 3 and( 553 ± 77) HV0. 3,respectively. The coatings with the oxygen flow rate of 462 L / min have the best performance of thermal shock resistance,and all the coatings especially the coating with the oxygen flow rate of 462 L / min have better corrosion resistance in the molten Al-12. 07% Si alloy after immersion test for 60 h. The weight loss of abrasive wear of Q235 steel is 6 times larger as much as the loss of the coating( oxygen flow rate 462 L / min).

关 键 词： 超音速火焰喷涂 涂层 显微组织 腐蚀 磨损

领　　域： [金属学及工艺] [金属学及工艺]