摘要
以-45^+15μm WC10Co4Cr团聚烧结球形喷涂粉末为原料,采用GTV超音速火焰喷涂(HVOF)系统K2喷枪,通过改变喷涂距离(300、340和380 mm)制备3种涂层,应用金相显微镜、X射线衍射仪、扫描电镜、显微硬度计等表征涂层结构和性能。结果表明:随喷涂距离减小,WC10Co4Cr涂层孔隙率降低、显微硬度增加、耐磨粒磨损性能增强,但粉末的沉积效率降低;喷涂距离为300~380 mm时,WC10Co4Cr涂层的物相组成均为WC、W2C及少量非晶相;喷涂距离为300~340 mm时,WC10Co4Cr涂层显微硬度和耐磨粒磨损性能变化较小;结合磨损区域中心位置的微观结构、涂层物理性能和表面粗糙度变化,探讨WC10Co4Cr涂层的磨粒磨损和喷涂距离的影响机制。
Three WC10Co4Cr coatings were prepared by high velocity oxygen fuel （HVOF） spray with various spraying distance （380, 340 and 300 mm） using agglomerated and sintered WC10Co4Cr powder with particle size range of -45～-15μm. The coatings properties were characterized by means of optical microscopy, X-ray diffraction （XRD）, scanning electron microscopy （SEM）, microhardness measurements and so on. The results indicate that with the spray distance decrease, WC 10Co4Cr coating＇s porosity decreases, microhardness increases, abrasive wear resistance enhances; spray distance from 300 mm to 380 mm has slightly effect on phase nature of the coatings, WC, W2C and small amount of amorphous phase are detected in the three sprayed coatings; spray distance from 300 mm to 340 mm has slightly effect on coatings microhardness and abrasive wear resistance. Abrasive wear mechanism and effect of different spray distance on the abrasive wear resistance properties of the WC10Co4Cr coating were also discussed, combining with the microstructure of the central site of wear area, the physical property of the spray and the changement of the surface roughness.
出处
《粉末冶金材料科学与工程》
EI
北大核心
2013年第2期217-223,共7页
Materials Science and Engineering of Powder Metallurgy
基金
国家科技支撑计划资助项目(2012BAE06B02)
2012年自贡市重点科技计划资助项目
湖南省科技计划资助项目(2012GK3172)
