Tribological behaviour of pulsed magnetron sputtered CrB2 coatings examined by reciprocating sliding wear testing against aluminium alloy and steel
Tribological behaviour of pulsed magnetron sputtered CrB2 coatings examined by reciprocating sliding wear testing against aluminium alloy and steel
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DOI：
10.1016/j.surfcoat.2007.06.057
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发表时间：
2008-01
影响因子：
5.4
通讯作者：
M. Audronis;Z. Rosli;A. Leyland;P. Kelly;A. Matthews
中科院分区：
文献类型：
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作者：
M. Audronis;Z. Rosli;A. Leyland;P. Kelly;A. Matthews
过渡金属二硼化物（TiB_2、CrB_2等）具有许多吸引人的性质。具有高耐磨性和化学惰性是最重要的，当考虑二硼化物涂层的非铁材料，如铝及其合金的干加工。主要由于二硼化铬的沉积问题（靶的制备、沉积过程中的靶破裂、化学计量的控制等），与例如二硼化钛相比，对这些涂层的摩擦学性能的研究相对较少。在本文中，我们报告的摩擦学行为的脉冲磁控溅射（PMS），光滑和完全致密，结晶，21-38 GPa硬CrB 2涂层在环境空气中（20±2 °C，20-30%湿度）对EN AW-2017 A铝合金和AISI 52100 Chrome钢往复滑动磨损试验研究。与脉冲磁控溅射沉积TiN和CrN涂层的结果进行了比较。它表明，脉冲磁控溅射二硼化铬涂层表现出最好的摩擦学性能，在磨损轨道的表面上粘附的铝的量，在测试期间对铝合金。当与AISI 52100钢PMS CrB 2、CrN和TiN涂层滑动时，其摩擦系数分别为0.6、0.6-0.7和0.43-0.45。涂层的摩擦学行为被认为是依赖于转移膜的形成和它的属性。与直流溅射Cr-B薄膜相比，脉冲磁控溅射CrB 2薄膜的磨损率低10倍。
Among the number of attractive properties that transition-metal diborides (TiB2, CrB2, etc.) possess, high resistance to wear and chemical inertness are the most important when considering diboride coatings for dry machining of nonferrous materials, such as aluminium and its alloys. Due mostly to the problematic deposition of chromium diboride (preparation of targets, target cracking during the deposition process, control of stoichiometry etc.), these coatings remain comparatively less studied than, for example, titanium diborides, regarding their tribological performance. In this paper we report on the tribological behaviour of pulsed magnetron sputtered (PMS), smooth and fully dense, crystalline, 21–38 GPa hard CrB2coatings examined by reciprocating sliding wear testing in ambient air (20±2 °C, 20–30% humidity) against EN AW-2017A aluminium alloy and AISI 52100 chrome steel. The results are compared to those of pulsed magnetron sputter deposited TiN and CrN coatings. It is demonstrated that pulsed magnetron sputtered chromium diboride coatings exhibit the best tribological performance, in terms of amount of aluminium adhered on the surface of the wear track, during testing against aluminium alloy. When slid against AISI 52100 steel PMS CrB2, CrN and TiN coatings exhibited coefficients of friction of 0.6, 0.6–0.7 and 0.43–0.45 respectively. The tribological behaviour of coatings was found to be dependent on the transfer film formation and its properties. Wear rates were up to ten times lower for pulsed magnetron sputtered CrB2coatings, compared to DC sputtered Cr–B films.