高功率半导体激光熔覆Ni-B型石英纤维涂层组织及性能研究

Microstructure and Properties of Ni-B Quartz Fiber Composite Coatings by High Power Diode Laser Cladding

采用连续高功率半导体激光器在45#钢表面熔覆制备了Ni-B型石英纤维复合涂层,通过光学显微镜(OM)、扫描电镜(SEM)及能谱仪(EDS)对涂层显微组织、成分进行了研究。结果表明,涂层与基体结合良好,呈冶金结合;涂层内中间偏上位置有少量黑色泡状物,直径为10~20mm,V槽底部存在由B型石英纤维溶解而形成的凹槽,且与周围Ni基及基体产生原子分子间扩散;硬度测试表明,涂层硬度呈阶梯状分布,最高达445HV0.3,为基体的3.25倍。

Ni-B quartz fiber composite coatings were prepared on 45 steel substrate by using a 3kW high power diode laser. The morphology of laser cladding layer is observed by optical microscope（OM） and scanning electronic microscope（SEM）, the com- position was analyzed through energy dispersive spectroscopy（EDS）. The results show that the composite coating has a metal- lurgical bonding with substrate. There is a small amount of black bubbles in the middle of the coating, which diameter is be- tween 10 mm and 20 mm. At the bottom of V-shaped cavity, there is a groove which caused by melted B type quartz fiber, which has spreaded on atomic or molecular sized level. Micro-hardness analysis shows that the coating hardness is ladder-like distribution, the highest micro-hardness is 445 HV0.3, that is 3.25 times than substrate.