In this paper, the sliding wear behaviour of WC–20Cr₃C₂–7Ni and lanthanum (III) oxide (La₂O₃) composite coating is investigated. The influence of lanthanum (III) oxide is evaluated by varying its proportion (1, 2 and 3 wt%) in WC–20Cr₃C₂–7Ni coating material. The high-velocity oxy-fuel (HVOF) technique is used to deposit the coatings on AISI 1020 carbon (C) steel. The mechanical strength and metallurgical quality of the deposit were confirmed by microhardness, adhesive strength and porosity measurements; scanning electron microscopy; and X-ray diffractometry. Further, the sliding wear behaviour of the composite coating is tested on pin-on-disc apparatus with silicon carbide (SiC) as counter material at room temperature. From the investigation, it was found that 2% lanthanum (III) oxide in WC–20Cr₃C₂–7Ni coating achieved good adhesive strength with minimum wear rate. Addition of lanthanum (III) oxide in WC–20Cr₃C₂–7Ni prevented the coating from undergoing boundary segregation, crack propagation and grain refinement. Abrasion and ploughing are the common wear mechanisms observed in worn surfaces.

中文翻译：

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热喷涂WC-20Cr3C2-7Ni和La2O3复合涂层的滑动磨损行为

本文研究了WC–20Cr ₃ C ₂ –7Ni 和氧化镧(La ₂ O ₃ ) 复合涂层的滑动磨损行为。通过改变其在 WC–20Cr ₃ C _{2 中的}比例（1、2 和 3 wt%）来评估氧化镧 (III) 的影响–7Ni 涂层材料。高速氧燃料 (HVOF) 技术用于在 AISI 1020 碳 (C) 钢上沉积涂层。沉积物的机械强度和冶金质量通过显微硬度、粘合强度和孔隙率测量得到证实；扫描电子显微镜; 和 X 射线衍射。此外，复合涂层的滑动磨损行为在室温下以碳化硅（SiC）作为反材料在针盘式设备上进行测试。从调查中发现，WC–20Cr ₃ C ₂ –7Ni 涂层中 2% 的氧化镧 (III)获得了良好的粘合强度和最小的磨损率。在 WC–20Cr ₃ C _{2 中添加}氧化镧 (III)–7Ni 防止涂层发生边界偏析、裂纹扩展和晶粒细化。磨损和犁耕是在磨损表面观察到的常见磨损机制。