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采用离子束辅助磁控溅射技术(IBAMS)沉积Cr-N硬质镀层,用压入法评定镀层的断裂韧性,多次冲击试验法测定镀层的多冲疲劳抗力,探讨了多冲疲劳抗力与镀层组织结构和断裂韧性等机械性能的关系。结果表明,通过调节离子束辅助轰击能量,可以提高Cr-N镀层的硬度和断裂韧性。镀层断裂韧性的提高除了与晶块尺寸减小有关外,还与离子轰击导致镀层致密度增加相关。在冲击载荷作用下Cr-N镀层的失效方式为内聚力型疲劳剥落,随硬度和断裂韧性增加,镀层的抗多次冲击疲劳能力提高。
The Cr-N hard coating was deposited by IBAMS and the fracture toughness of the coating was evaluated by press-in method. The multi-impact fatigue resistance of the coating was measured by multiple impact tests. The effects of multi-impact fatigue resistance and Coating structure and fracture toughness and other mechanical properties of the relationship. The results show that the hardness and fracture toughness of Cr-N coating can be improved by adjusting the ion bombardment bombardment energy. In addition to improving the fracture toughness of the coating, the size of the ingot is also related to the ion bombardment resulting in an increase in the density of the coating. Under the impact load, the failure mode of Cr-N coating is cohesive type fatigue spalling. With the increase of hardness and fracture toughness, the anti-repeated impact fatigue resistance of the coating increases.