School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran , Tehran, Iran.
Department of Materials Science and Engineering, Shahrood University of Technology , Shahrood, Iran.
ACS Appl Mater Interfaces. 2017 Sep 6;9(35):30149-30160. doi: 10.1021/acsami.7b08565. Epub 2017 Aug 24.
A novel functional multilayer coating with periodically stacked nanolayers of amorphous carbon (a:C)/tungsten carbide (WC) and an adhesion layer of chromium (Cr) was deposited on 304 stainless steel using a dual magnetron sputtering technique. Through process optimization, highly densified coatings with high elasticity and shear modulus, excellent wear resistance, and minimal susceptibility to corrosive and caustic media could be acquired. The structural and mechanical properties of the optimized coatings were studied in detail using a variety of analytical techniques. Furthermore, finite element method simulations indicated that the stress generated due to contact against a steel ball was distributed well within the coating, which allowed the stresses to be lower than the yield threshold of the coating. Thus, an ultralow wear rate of ∼10mm/N mm could be achieved in dry sliding conditions under relatively high Hertzian contact pressures of ∼0.4-0.9 GPa. The amorphous and pinhole-free structure of the individual layers, sufficient number of pairs, and the relatively dense stacked layers resulted in significant polarization resistance (Z″ = 5.5 × 10 Ω cm) and increased the corrosion resistance of the coating by 10-fold compared to that of recently reported corrosion-resistant coatings.
采用双磁控溅射技术在 304 不锈钢上沉积了一种具有周期性堆叠非晶碳(a:C)/碳化钨(WC)纳米层和铬(Cr)附着层的新型功能多层涂层。通过工艺优化，可以获得高致密度、高弹性和剪切模量、优异的耐磨性、对腐蚀性和苛性介质最小敏感性的涂层。使用各种分析技术详细研究了优化涂层的结构和力学性能。此外，有限元方法模拟表明，由于与钢球接触而产生的应力在涂层内分布良好，这使得应力低于涂层的屈服阈值。因此，在相对较高的赫兹接触压力（约 0.4-0.9 GPa）下，在干燥滑动条件下可以实现低至约 10mm/N mm 的超低磨损率。单个层的非晶和无针孔结构、足够数量的对以及相对致密的堆叠层导致显著的极化电阻（Z″=5.5×10 Ω cm），并使涂层的耐腐蚀性提高了 10 倍，优于最近报道的耐腐蚀涂层。
