Micro-abrasion wear testing of triode plasma diffusion and duplex treated Ti–6Al–4V alloy
Micro-abrasion wear testing of triode plasma diffusion and duplex treated Ti–6Al–4V alloy
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DOI：
10.1016/j.wear.2011.10.002
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发表时间：
2012-01
期刊：
影响因子：
5
通讯作者：
G. Cassar;S. Banfield;J. I. B. Wilson;J. Housden;A. Matthews;A. Leyland
中科院分区：
文献类型：
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作者：
G. Cassar;S. Banfield;J. I. B. Wilson;J. Housden;A. Matthews;A. Leyland
本文采用微磨粒磨损试验来评价三极管等离子体扩散处理的单层TiN、CrAlN和WC/C涂层以及双层扩散涂层Ti-6Al-4V在均匀三体滚动磨损下的耐磨性。纳米压痕、努普显微硬度、机械表面轮廓测量、光学显微镜、扫描电子显微镜和原子力显微镜用于表征所研究的表面。通过改变测试参数和由此产生的接触严重程度，建立了滚动磨损的最佳测试条件。为了获得可预测和可重复的结果，磨料浆中颗粒的极低法向载荷和高体积分数是必要的。与较细的 Al2O3 颗粒相比，相对较粗的 SiC 磨料颗粒（平均直径约为 3μm）似乎更适合所研究样品的微磨损测试。确定了与疤痕体积测量和随后计算沉积在相对较软的金属（如钛）上的硬涂层的磨损率相关的问题，并提出了合适的测试和测量技术。使用机械触针轮廓测量法生成的三维磨损疤痕图来测量磨损量。在所使用的测试条件下，磨损系数可以通过穿孔和非穿孔测试来确定，尽管穿孔测试提供了更一致的结果。三极管等离子体扩散处理、等离子体辅助 (PA) PVD TiN 和 PAPVD CrAlN 可以降低 Ti-6Al-4V 的比磨损率，而基于 PACVD 的 WC/C 涂层不能提供适当的磨料磨损保护。与沉积在未经预处理的基材上的非双相涂层相比，三极管等离子体氮氧化扩散处理和 PVD 涂层相结合来创建双相处理还可以进一步降低涂层磨损系数。
In this paper micro-abrasion wear testing is used to evaluate the wear resistance of triode plasma diffusion-treated, single-layered TiN-, CrAlN-, and WC/C-coated and duplex-diffusion and coated Ti–6Al–4V under uniform three-body rolling abrasion. Nanoindentation, Knoop microhardness, mechanical surface profilometry, optical microscopy, scanning electron microscopy and atomic force microscopy, were used to characterise the surfaces under investigation. Optimum testing conditions for rolling abrasion were established by varying the test parameters and resultant severity of contact. Very low normal loads and high volume fractions of particles in the abrasive slurry are necessary to obtain predictable and reproducible results. Relatively coarse SiC abrasive particles, having a mean diameter of around 3μm, appear more suitable for micro-abrasion testing of the samples investigated, compared to finer Al2O3particles. Problems associated with the measurement of the scar volume and subsequent calculation of the wear rate for hard coatings deposited on relatively soft metals like titanium are identified, and suitable testing and measurement techniques are suggested. Three-dimensional wear scar maps generated by mechanical stylus profilometry were used to measure the wear volumes. Under the test conditions used, wear coefficients can be determined from perforating and non-perforating tests, although perforating tests provide more consistent results. Triode plasma diffusion treatments, plasma-assisted (PA) PVD TiN and PAPVD CrAlN can reduce the specific wear rate of Ti–6Al–4V, while PACVD-based WC/C coatings do not provide suitable protection against abrasive wear. The combination of triode plasma oxynitriding diffusion treatments and PVD coatings to create duplex treatments can also lead to further reductions in the coating wear coefficient when compared to non-duplex coatings deposited on non-pretreated substrates.