【摘要】 采用非平衡磁控溅射技术,在高淬火高回火H13钢及再加氮化的H13钢表面沉积CrN及CrMoN涂层,分析和测试涂层的微观结构和形貌、纳米硬度和弹性模量、摩擦学性能,以及涂层对两种基体热疲劳性能的影响。结果表明,CrN和CrMoN涂层均匀致密,呈FCC结构,有效地强化了H13钢表面。与CrN涂层相比,CrMoN涂层有着更高的纳米硬度(21.73GPa)、弹性模量(268.34 Ga)以及更低的摩擦系数(0.37),从而更有效地改善了H13钢的摩擦学性能。此外,CrMoN涂层大大改善了H13钢抗热疲劳性能,经1 000次热疲劳实验,表面无明显的宏观裂纹,损伤因子近似为零。其次,CrN涂层也显示了较低的表面损伤因子(0.009),裂纹数量明显减少。然而,CrMoN和CrN涂层难以缓解氮化H13钢表面粗大的网状裂纹,表面损伤因子(0.032,0.104)明显高于H13钢(0.012)。更多还原

【Abstract】 CrMoN and CrN coating were deposited on the surface of H13 and nitrided H13 steels by an unbalanced magnetron sputtering technology.Micro-morphology and structure,nano-hardness and elastic modules,wear resistance of these coatings were characterized.Finally,effect of the coatings on thermal fatigue was studied.The experimental results showed that the coating morphologies appeared smooth and homogenous with FCC structure,effectively strengthening the surface of H13 steel.Comparing with CrN coating,CrMoN coating had higher nano-hardness(21.73 GPa) and elastic modules(268.34 GPa),and a lower frictional coefficient(0.37),giving rise to improve tribological properties.Furthermore,CrMoN coating significantly increased resistance to thermal fatigue with a little surface damage factor.Also,CrN coating exhibited a low surface damage factor(0.009).However,CrMoN and CrN coatings hardly impeded to form wide deep cross cracklings,resulting a much high surface damage factor(0.032,0.104),compared to H13 steel(0.012).更多还原