Enhancing the wear resistance ofmagnetron sputtered VN coating by Si addition
Enhancing the wear resistance ofmagnetron sputtered VN coating by Si addition
复制标题
添加Si提高磁控溅射VN涂层的耐磨性
作者：
葛芳芳;朱萍;孟凡平;黄峰
虽然Si添加到过渡金属氮化物中早已被认为可以提高涂层的硬度，但相对较少的证据表明，硬度的增加可以转化为预期的耐磨性的显著改善。TM-Si-N涂层的磨损率通常大于10− 16 m3/Nm。在此，我们通过在VN涂层中添加Si来制备VSiN涂层，并研究了VSiN涂层的摩擦磨损行为，其磨损率达到10− 17 m3/Nm数量级。摩擦磨损行为进行了研究，通过球-板滑动试验对Al 2 O3球（3或6 mm直径），然后通过显微镜检查磨损表面。VN涂层在~ 104次滑动循环后，轻度磨损转变为疲劳失效，并伴有裂纹的生长和扩展，而VSiN涂层在105次滑动循环后仍保持轻度磨损，其中滑动磨损主要通过摩擦氧化去除机制进行。VSiN的耐磨性的提高主要归因于其特殊的纳米复合结构，限制了沿晶裂纹，从而抑制了以晶界为主的磨损。基于这些结果，提出了在开发低磨损过渡金属氮化物涂层时，可以考虑抗磨料主导磨损的能力。
Although Si addition into transition metal nitrides has been long known to enhance hardness of coatings, relatively less evidence indicates that the hardness gain can be translated into a significant improvement of wear resistance as expected. The reported wear rates of TM–Si–N coatings are generally greater than 10−16m3/N m. Here, we prepared VSiN coatings by adding Si into VN coatings, and investigated the friction-wear behavior of the VSiN coatings which achieved wear rates on the 10−17m3/N m order of magnitude. The friction-wear behavior was studied by ball-on-plate sliding tests against Al2O3balls (3 or 6 mm in diameter), followed by microscopic examination on the worn surfaces. For the VN coating mild wear transited to fatigue failure after ~104sliding cycles with crack growth and propagation, whereas the VSiN coatings retained mild wear more than 105cycles, in which the sliding wear proceeded predominately by tribo-oxidation removal mechanism. The enhanced wear resistance of the VSiN could be mainly attributed to their special nanocomposite structure that limited intergranular cracks, and then suppressed fracture-dominated wear. Based on the results, it was proposed that the resistance to fracture-dominated wear could be taken into account for developing low-wear transition-metal nitride coatings.