The aim of this work is to quantitatively describe the carbide loss during plasma deposition of metal carbide coatings and link it to the microstructure and performance of the as-sprayed coatings. To do this, a carbide loss index is defined. The results suggest that the microstructure and performance of such coatings can be tailored by controlling the content of carbides based on the proposed carbide loss index. The size of the particles in flight had the most significant effect on the carbide loss during the processing of the powder in the plasma jet. When the carbide loss index decreased from 0.028 to 0.014, the carbide content in the NiCr-Cr 3 C 2 coating increased from 23.18 to 34.43 vol.%, effectively improving the microhardness of the coating and eliminating the formation of cluster cracks between the carbides and metal binder. In ball-on-disk friction testing with a Si 3 N 4 ball, the coating with the highest content of carbides showed the lowest friction coefficient and best tribological properties. This study provides in-depth understanding of the nature of carbide loss and the factors that affect it under plasma spray conditions.

中文翻译：

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等离子喷涂 NiCr-Cr3C2 金属碳化物涂层碳化物损失的定量表征及其与微观结构和性能的相关性

这项工作的目的是定量描述金属碳化物涂层等离子沉积过程中的碳化物损失，并将其与喷涂涂层的微观结构和性能联系起来。为此，定义了碳化物损失指数。结果表明，这种涂层的微观结构和性能可以通过基于建议的碳化物损失指数控制碳化物的含量来定制。在等离子射流中处理粉末期间，飞行中颗粒的尺寸对碳化物损失的影响最显着。当碳化物损失指数从0.028降低到0.014时，NiCr-Cr 3 C 2 涂层中碳化物含量从23.18 vol.%增加到34.43 vol.%，有效提高了涂层的显微硬度，消除了碳化物和碳化物之间簇裂纹的形成。金属粘合剂。在使用 Si 3 N 4 球的球盘摩擦测试中，碳化物含量最高的涂层表现出最低的摩擦系数和最佳的摩擦学性能。该研究深入了解了等离子喷涂条件下碳化物损失的性质及其影响因素。