微束等离子喷涂NiCrBSi涂层

采用微束等离子喷涂方法在St37低碳钢上制备了NiCrBSi涂层.研究了基材温度、等离子气体流量、喷涂距离和电流强度等工艺参数对涂层组织结构和性能的影响.采用光学显微镜观察涂层的组织结构,用Perthometers M4P 150测定涂层的表面粗糙度,以及用LECO TC316气体抽提仪检测涂层的氧含量.结果表明,在试验条件下,喷涂参数对涂层组织和性能产生较大的影响.随着电流和基材温度的增加涂层的粗糙度降低,涂层的氧含量随着基材温度和喷涂距离的增加而增加.大多数涂层的显微硬度大于600 HV0.2.尽管粒子速度较低,涂层的平均结合强度仍然大于50 MPa.

NiCrBSi coatings by microplasma spraying

The NiCrBSi coatings were deposited onto St37 steel substrates by microplasma spraying (MPS). The influence of the spraying parameters such as substrate temperature, plasma gas flow rate, electric current intensity and spray distance on the microstructure and properties of coatings was investigated by means of statistical experimental design. The coatings were studied in terms of their microstructure using optical microscope. The surface roughness of the coatings was measured by a Perthometers M4P 150. And the oxygen content of the coatings was determined by a LECO TC316 gas extract equipment. The results showed that the spraying parameters influenced significantly on the properties of the coatings. The coating roughness decreased with increasing current intensity and substrate temperature. The oxygen content in the coatings increased with increasing substrate temperature and spray distance. Most of the coatings had a hardness over 600 HV0.2. The coatings exhibited a high bonding strength about more than 50 MPa despite relatively low particle velocities.