The effect of Ti （ C, N） on properties of low-carbon MgO - C bricks was investigated. The phase composition and the microstructure of the matrix of low-carbon MgO - C brick containing Ti （ C, N） were studied by XR...The effect of Ti （ C, N） on properties of low-carbon MgO - C bricks was investigated. The phase composition and the microstructure of the matrix of low-carbon MgO - C brick containing Ti （ C, N） were studied by XRD and SEM analysis together with EDS. The results showed that Ti （ C, N） distributed in the matrix of lowcarbon MgO - C brick uniformly after being treated at 1 600 ~C for 3 h in coke powder bed, and Ti （C, N） and MgO formed a solid solution. After the treatment at 1 600 ℃ for 3 h in coke powder bed, the bulk density and cold crushing strength of low-carbon MgO - C brick with Ti （ C, N） decreased, and the apparent porosity and linear change rate of specimens increased. The oxidation resistance of low-carbon MgO - C brick with Ti（ C, N） was superior to that of low-carbon MgO - C brick with no additives, but inferior to that of low-car- bon MgO - C brick with Al powder. The slag resistance of the specimen with Ti （ C, N） was excellent as well.展开更多
文摘以Ni60A粉为预置涂层,以Ti C粉、Ti N粉、WC粉和Co粉为喷射材料,采用新型的超声波辅助氩弧熔覆-喷射技术,在基体Q235钢板上制备Ti(C,N)增强Ni60A复合涂层。通过调整粉末的喷射速度来改变熔覆层中增强颗粒的比例,并借助光学显微镜、扫描电子显微镜、能谱仪、显微硬度计以及摩擦磨损试验机等仪器对制备的涂层进行组织形貌、化学成分、显微硬度和耐磨性的分析。结果表明,借助超声波振动的辅助效果,以及喷射粉末的均匀性,在喷射速度较小时,增强颗粒分布均匀,而过大的喷射速度,则易出现团聚现象,熔覆效果变差。当喷射速度为0.4 m L/min时,涂层表面形貌美观,结合强度高,综合性能优良。涂层的平均显微硬度比基体Q235钢提高了约6倍,耐磨性提高了约13倍。
文摘The effect of Ti （ C, N） on properties of low-carbon MgO - C bricks was investigated. The phase composition and the microstructure of the matrix of low-carbon MgO - C brick containing Ti （ C, N） were studied by XRD and SEM analysis together with EDS. The results showed that Ti （ C, N） distributed in the matrix of lowcarbon MgO - C brick uniformly after being treated at 1 600 ~C for 3 h in coke powder bed, and Ti （C, N） and MgO formed a solid solution. After the treatment at 1 600 ℃ for 3 h in coke powder bed, the bulk density and cold crushing strength of low-carbon MgO - C brick with Ti （ C, N） decreased, and the apparent porosity and linear change rate of specimens increased. The oxidation resistance of low-carbon MgO - C brick with Ti（ C, N） was superior to that of low-carbon MgO - C brick with no additives, but inferior to that of low-car- bon MgO - C brick with Al powder. The slag resistance of the specimen with Ti （ C, N） was excellent as well.
