目的：对比研究微/纳米Al2 O3等离子喷涂涂层的组织、力学及摩擦磨损行为。方法以纳米Al2 O3粉末为原料,利用喷雾干燥法制备出粒径分布在35~75μm的喷涂喂料,采用等离子喷涂技术在20钢基体上制备纳米Al2 O3涂层。采用商用微米Al2 O3喂料,以相同的喷涂工艺制备出微米Al2 O3涂层。对粉末、涂层的显微结构及涂层的磨损形貌进行表征,对比分析两种涂层的组织、力学性能和摩擦磨损行为。结果与微米Al2 O3涂层相比,纳米Al2 O3涂层粒子间结合更为致密,使得其结合强度和显微硬度得到大幅度提高。在载荷750 g,转速1000 r/min的条件下,微米Al2 O3涂层的摩擦系数为0.41,而纳米Al2 O3涂层仅为0.34,并且摩擦系数值的波动幅度更为稳定。在不同转速下,纳米Al2 O3涂层的磨损率均降低明显。结论纳米Al2 O3等离子喷涂涂层组织致密,表现出了较好的力学性能和耐磨性。
Objective To study the microstructures, mechanical and tribological properties of Al2 O3 micro-nano coatings. Methods Nanosized Al2 O3 powders were deposited using atmospheric plasma spraying technique. Particle size distributed from 35 to 75 μm, consisted of nano-Al2 O3 , were obtained by spray drying. Micro-coatings of commercial Al2 O3 feedstocks were also pre-pared as control. Microstructure of powders and coatings, as well as the worn surface of coatings, were characterized. Moreover, microstructure, mechanical and tribological behaviors of both nano and micro coatings were analyzed, respectively. Results Al2 O3 nano-coatings showed a better interface bonding between the layers compared with Al2 O3 micro coatings which resulted in great im-provement of adhesion strength and microhardness of Al2 O3 nano coatings. The friction coefficient of Al2 O3 micro coating is 0. 41 while Al2 O3 nano coating 0. 34 at the speed of 1000 r/min and 750 g load. Conclusion Al2 O3 nano coatings showed a better me-chanical properties and wear resistance due to the excellent microstructure.
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