Cr_(3)C_(2)-NiCrMoNbAl热喷涂粉末制备工艺研究

Study on Preparation Technology of Cr_(3)C_(2)-NiCrMoNbAl Thermal Spraying Powder

热喷涂技术是一种先进的表面强化技术,热喷涂粉末材料性能好坏严重影响着涂层的性能和寿命。以Cr_(3)C_(2)、Ni、Cr、Mo、Nb和Al粉为原料,通过团聚烧结法制备了Cr_(3)C_(2)-NiCrMoNbAl热喷涂粉末,并使用超音速火焰喷涂(HVOF)技术制备了涂层。采用筛分机、扫描电镜、金相显微镜、X-射线衍射仪研究分析雾化器转速和烧结温度对粉末结构和性能的影响,并验证该粉末热喷涂涂层性能。结果表明:离心雾化器转速增加,获得的粉末粒径减小,粒度分布范围变宽;1285℃烧结制备的喷涂粉末金相结构更均匀,粉末形貌更好,粉末松装密度为2.83 g/cm^(3),将该粉末进行热喷涂,涂层的显微硬度(HV0.3)为1021±52,孔隙率为1.2±0.1%,涂层综合性能达到最优。

The Cr_(3)C_(2)-NiCrMoNbAl thermal spray powder was fabricated via agglomeration and sintering process,utilizing Cr_(3)C_(2),Ni,Cr,Mo,Nb,and Al powders as the starting materials.Subsequently,the coating was prepared by employing the high-velocity oxygen-fuel(HVOF)spraying technology.The effect of atomizer speed and sintering temperature on the structure and properties of the powder was investigated by using sieving machine,scanning electron microscope,metallographic microscope,and X-ray diffractometer.Meanwhile,the thermal spray coating performance of the powder was also evaluated.The results revealed that as the atomizer speed increased,the powder particle size declined,and the particle size distribution range broadened.Furthermore,the powder sintered at 1285℃ exhibited a more uniform metallographic structure,superior powder morphology,and a apparent density of 2.83 g/cm^(3).The thermal spray coating,which was fabricated by the synthesized Cr_(3)C_(2)-NiCrMoNbAl powder,demonstrated outstanding comprehensive performance with a microhardness(HV0.3)of 1021±52,a porosity of 1.2±0.1%.