The mechanical and tribotechnical properties of detonation-sprayed coatings produced from (Ti, Cr)B2–NiAlCr composites were studied. The influence of various preliminary substrate treatment methods and refractory-to-metal ratio in the spray material on the coating–substrate adhesion strength, σad, was analyzed. Spraying a sublayer had no significant effect on the coating adhesion strength. The adhesion strength σad increased by 25–30% with the metal content changing from 25 to 75%, while σad = 120–145 MPa even at 25% NiAlCr. The hardness of the coatings changed within rather narrow limits (HV0.2 = 7–12 GPa), but the refractory-to-metal ratio varied over a wide range. The coatings containing a minimum amount of the metal component (25%) were predicted to have higher hardness, HV0.2 = 10–12 GPa, though it was almost half the hardness of the sintered compact material. At equal contents of the refractory and metal components, HV0.2 = 9–10 GPa; for the material containing 75% of the metal component, HV0.2 = 7–8 GPa. The tribotechnical properties of the coatings were studied in dry sliding friction conditions with ball-ondisk tests. At the initial friction stage, high pressures appeared in the contact zone (P ≥ 500 MPa). Therefore, in addition to high hardness, the coatings should have high strength. At 50–75% (Ti, Cr)B2, besides abrasion processes, brittle fracture and spalling of the coatings occurred. The best characteristics were shown by the coating produced from the material containing 25% (Ti, Cr)B2. Since the (Ti, Cr)B2 particles are fine, wetted well by the NiAlCr alloy, and uniformly distributed over the starting material and associated coating, even their relatively low content (25%) promotes high abrasion resistance and adhesion.

中文翻译：

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(Ti, Cr)B2-NiAlCr 复合材料的爆炸喷涂涂层 II。机械和摩擦技术特性

研究了由 (Ti, Cr)B2-NiAlCr 复合材料制成的爆炸喷涂涂层的机械和摩擦技术性能。分析了各种初步基材处理方法和喷涂材料中耐火金属比对涂层-基材粘附强度σad 的影响。喷涂亚层对涂层附着强度没有显着影响。随着金属含量从 25% 变为 75%，粘附强度 σad 增加了 25-30%，而即使在 25% NiAlCr 下，σad = 120-145 MPa。涂层的硬度在相当窄的范围内变化（HV0.2 = 7-12 GPa），但耐火材料与金属的比率在很宽的范围内变化。预计含有最少量金属成分 (25%) 的涂层具有更高的硬度，HV0.2 = 10-12 GPa，虽然它几乎是烧结体材料硬度的一半。在耐火材料和金属成分含量相等的情况下，HV0.2 = 9-10 GPa；对于含有 75% 金属成分的材料，HV0.2 = 7-8 GPa。在干滑动摩擦条件下通过球盘试验研究了涂层的摩擦技术性能。在初始摩擦阶段，接触区出现高压（P≥500 MPa）。因此，除了高硬度外，涂层还应具有高强度。在 50-75% (Ti, Cr)B2 时，除了磨损过程外，还会发生涂层的脆性断裂和剥落。由含有 25% (Ti, Cr)B2 的材料制成的涂层显示出最佳特性。由于 (Ti, Cr)B2 颗粒细小，被 NiAlCr 合金润湿良好，