通过镀/渗复合改性方法在5083铝合金表面原位制备出梯度复合层,利用闭合场非平衡磁控溅射离子镀在5083铝合金表面沉积厚度约为6.0 μm的Ti膜,然后将镀钛5083铝合金在490℃进行等离子渗氮8h,研究了不同渗氮气氛(微量N,N-H比为0.05∶0.3,0.2∶0.3和0.3∶0.3)对复合层组织结构和力学性能的影响.结果表明:复合层由双层结构组成,即外层TiN03和靠近铝基体一侧的铝基金属化合物A118Ti2 Mg3,不同渗氮气氛下表层TiN0.3均出现(002)晶面择优生长,在N-H比为0.2∶0.3时,复合层的表面硬度高达880 HV,相比于未处理的基体铝合金硬度(98 HV)提高了约9倍.复合层的摩擦系数明显低于未处理态,并且磨损率显著降低.
Duplex coatings were prepared on 5083 aluminum alloy surface by plasma nitriding.Firstly,Ti film with thickness of about 6.0 μm was deposited on the surface of 5083 aluminum alloy by a closed field unbalanced magnetron sputtering equipment and then plasma nitrided at 490 ℃ for 8 h,and effects of nitriding atmosphere on microstructure and mechanical properties of the coatings were investigated.The results show that the as-obtained coatings consist of two sub-layers,the outside TiN0.3 layer and the inside Al18 Ti2Mg3 layer.TiN0.3 layers exhibit preferred (002) orientation under various nitriding atomsphere.The maximum surface hardness of 880 HV is achieved at the N-H ratio of 0.2∶ 0.3,which is about 9 times of that of the untreated substrate.The duplex coatings exhibit low friction coefficient and wear rates.
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