Effects of annealing temperature on the microstructure, mechanical and tribological properties of CrAlTiN coatings
Effects of annealing temperature on the microstructure, mechanical and tribological properties of CrAlTiN coatings
复制标题
DOI：
10.1016/j.surfcoat.2022.128887
复制
发表时间：
2022-10-20
影响因子：
5.4
通讯作者：
Zhou, Qiong
中科院分区：
文献类型：
--
作者：
Huang, Biao;Zhang, Er-geng;Zhou, Qiong
系统研究了不同气氛退火温度下CrAlTiN涂层的显微组织、力学性能和摩擦学性能。结果表明，随着退火温度从室温升高到800℃，涂层硬度降低，但弹性应变抗力H/E值先增大后减小。沉积的CrAlTiN涂层为面心立方结构，(111)和(200)面呈现竞争生长，而高退火温度促进了(200)面的生长。 CrAlTiN涂层对Si3N4球的主要磨损机制是粘着磨损和氧化磨损。 400℃退火的涂层磨损率最低，800℃退火的涂层在摩擦过程中剥落。具有润滑性和高硬度的氧化铬、氧化铝和氧化钛附着在磨损轨迹上，起到支撑平衡球的作用，获得较低的涂层摩擦系数。 600℃以上退火的涂层更容易形成广泛光滑致密的氧化物粘合剂，但需要更长的时间才能达到稳定的磨损阶段。因此，优选的退火温度可以有效调节微观结构，提高CrAlTiN涂层的力学和摩擦学性能。
The microstructure, mechanical properties and tribological properties of CrAlTiN coatings with various atmo-spheric annealing temperature are systematically investigated. The results show that the hardness of the coating decrease with the annealing temperature increasing from room temperature to 800 degrees C, however, the elastic strain resistance H/E value increase firstly and then decrease. The deposited CrAlTiN coating is face-centered cubic structure, (111) and (200) planes show competition growth, while high annealing temperature promotes the growth of (200) planes. The main wear mechanisms of CrAlTiN coating against Si3N4 ball are adhesive and oxidative. The coatings annealed at 400 degrees C has the lowest wear rate and annealed at 800 degrees C peeled off during the friction process. The chromium oxide, aluminium oxide and titanium oxide with lubricating and high hardness adhered on the wear tracks, playing the role of supporting the counterballs, a low COF of the coating is obtained. The coatings annealed above 600 degrees C are more easily to form extensive smooth and dense oxide adhesives, but it takes longer to reach stable wear stage. Thus, the preferred annealing temperature could effectively regulate the microstructure and improve the mechanical and tribological properties of CrAlTiN coating.