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通过机械合金化技术制备出TiB2-50Ni粉末,采用超音速火焰喷涂方法在Q235钢表面制备TiB2-50Ni涂层,研究3种不同喷涂参数对涂层组织结构和性能的影响。运用扫描电镜分析了涂层的组织结构、X射线衍射表征涂层的物相结构,用压入法测定了涂层的显微硬度,并对涂层的抗热震性能和耐熔融铝硅腐蚀性能进行研究。结果表明,涂层均具有致密的组织结构,其中以氧气流量10~11 m3/h和氮气流量1100~1200 L/min喷涂参数下(No.3)的涂层试样的孔隙率最低和厚度最厚;涂层的主要物相与粉末相同;No.1~No.3号涂层试样的硬度值分别为(321.19±17.1)HV0.3、(464.84±49.2)HV0.3和(597.92±36.1)HV0.3;涂层均具有较好的抗热震性能,其中以3号涂层试样最佳;经过120 h熔融铝硅腐蚀后发现,涂层均具有良好的抗熔融铝硅腐蚀性能,3号涂层试样具有最好的耐腐蚀性能。
TiB2-50Ni powders were prepared by mechanical alloying and TiB2-50Ni coatings were prepared on the surface of Q235 steel by supersonic flame spraying. The effects of three different spraying parameters on the microstructure and properties of the coatings were studied. The microstructure of the coating was analyzed by scanning electron microscopy. The phase structure of the coating was characterized by X-ray diffraction. The microhardness of the coating was measured by the push-in method. The thermal shock resistance and corrosion resistance of the coating were also studied. Performance research. The results show that all the coatings have a dense structure with the lowest porosity and thickness of the coating (No.3) at the oxygen flow rate of 10 ~ 11 m3 / h and the nitrogen flow rate of 1100 ~ 1200 L / min The hardness of the coating was the same as that of the powder. The hardness values of the coatings No.1 to No.3 were (321.19 ± 17.1) HV0.3, (464.84 ± 49.2) HV0.3 and (597.92 ± 36.1) HV0.3. All the coatings have good thermal shock resistance, of which the coating No. 3 is the best. After 120 h of molten aluminum-silicon etching, it is found that the coatings have good anti-melted Al-Si Corrosion performance, No. 3 coating sample has the best corrosion resistance.