The effect of the size of initial particles of WC – 12% Co powder on the microstructure and mechanical properties of coatings plasma sprayed onto a substrate from steel Nitronic 50 is studied. The microstructure of the coatings is investigated by scanning electron microscopy and x-ray diffraction. The microhardness and the wear resistance are determined. It is shown that the coatings deposited from the fine powder have greater thickness and almost twice lower porosity than the coatings from the coarse powder. However, the plasma sprayed coarse powder undergoes less decarburization. The coating from WC – 12% Co raises the surface hardness and wear resistance of Nitronic 50 by a factor of 6 – 7.

研究了 WC – 12% Co 粉末的初始颗粒尺寸对 Nitronic 50 钢等离子喷涂到基材上的涂层的微观结构和机械性能的影响。通过扫描电子显微镜和X射线衍射研究涂层的微观结构。测定显微硬度和耐磨性。结果表明，由细粉末沉积的涂层比由粗粉末沉积的涂层具有更大的厚度和几乎低两倍的孔隙率。然而，等离子喷涂的粗粉脱碳较少。WC – 12% Co 涂层将 Nitronic 50 的表面硬度和耐磨性提高了 6 – 7 倍。