Nano-Scratch and Micro-Scratch Properties of CrN/DLC and DLC-W Coatings

IF 0.6 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Performance and Characterization Pub Date : 2023-10-06 DOI:10.1520/mpc20230028

Funsho Olaitan Kolawole, Marcos Dantas dos Santos, Shola Kolade Kolawole, Paulo Konrad Vencovsky, Danilo Assad Ludewigs, André Paulo Tschiptschin

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引用次数: 0

Abstract

Diamond-like carbon (DLC) coatings are well known for their excellent adhesion to silicon wafers. However, they often exhibit poor adhesion properties on metallic substrates. Interlayers and metallic doping help improve the adhesion properties of DLC coatings on metallic substrates. In this study, both nano-scratch and micro-scratch were performed on chromium nitride (CrN)/DLC and tungsten doped DLC coating (DLC-W) coatings deposited on 920 HV DIN 16CrMn martensitic valve tappets. Nano-scratch was performed at 300 mN in a Hysitron nano-indenter, whereas micro-scratch was performed at 1–50 N using a CETR-UMT tribometer. The 3-D images and 2-D longitudinal and transversal profiles of the nano-scratch and micro-scratch were obtained using atomic force microscopy and 3-D optical profilometry, respectively. The scratch hardness equation was used to estimate the scratch hardness of the coatings. Experimental and theoretical values for the volume removed and the specific wear rates for the micro-scratch and nano-scratch of CrN/DLC and DLC-W coatings were estimated. The coefficients of friction (COF) obtained during the micro-scratch tests were very similar for both coatings. The same happened with the COF measured during the nano-scratch. The maximum COF in both cases reached 0.14. The wider and deeper penetration of the indenter for the DLC-W coating was mainly due to the lower hardness of the multilayered coating, composed of alternating nanometric thick amorphous carbon and tungsten carbide (WC) layers. The greater wear observed for the DLC-W coating system could also be attributed to the abrasive effect of detached WC nanoparticles abrasively acting during the contact of the diamond tip with the DLC coating. The experimental and theoretical values for the volume removed and the specific wear rates indicate a lower volume removal and specific wear rate for CrN/DLC because of higher hardness and better load-carrying capacity, contrary to DLC-W, which presents higher volume removal and specific wear rate because of its lower hardness.

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CrN/DLC和DLC- w涂层的纳米划伤和微划伤性能

类金刚石(DLC)涂层以其与硅片的优异附着力而闻名。然而，它们在金属基板上的粘附性能往往很差。中间层和金属掺杂有助于提高DLC涂层在金属基底上的附着力。在本研究中，对沉积在920 HV DIN 16CrMn马氏体气门挺杆上的氮化铬(CrN)/DLC和掺钨DLC涂层(DLC- w)进行了纳米划伤和微划伤处理。使用hyysitron纳米压头在300 mN下进行纳米划痕，而使用center - umt摩擦计在1-50 mN下进行微划痕。利用原子力显微镜和三维光学轮廓术分别获得了纳米划痕和微划痕的三维图像和二维纵向和横向轮廓。采用划痕硬度方程估计涂层的划痕硬度。估算了CrN/DLC和DLC- w涂层微划痕和纳米划痕的去除体积和比磨损率的实验值和理论值。两种涂层在微划痕试验中获得的摩擦系数(COF)非常相似。在纳米划痕中测量的COF也发生了同样的情况。两种情况下的最大COF均达到0.14。DLC-W涂层的压头穿透更宽、更深，主要是由于由纳米厚非晶碳层和碳化钨(WC)层交替组成的多层涂层硬度较低。DLC- w涂层系统的较大磨损也可归因于金刚石尖端与DLC涂层接触过程中分离的WC纳米颗粒的磨蚀作用。去除体积和比磨损率的实验值和理论值表明，CrN/DLC的去除体积和比磨损率较低，因为其硬度较高，承载能力较好，而DLC- w的去除体积和比磨损率较高，因为其硬度较低。

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来源期刊

Materials Performance and Characterization MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

2.20

自引率

9.10%

发文量

期刊介绍： The journal is published continuously in one annual issue online. Papers are published online as they are approved and edited. Special Issues may also be published on specific topics of interest to our readers. Materials Performance and Characterization provides high-quality papers on both the theoretical and practical aspects of the processing, structure, properties, and performance of materials used in: -mechanical -transportation -aerospace -energy and -medical devices. -Materials Covered: (but not limited to) -Metals and alloys -Glass and ceramics -Polymers -Composite materials -Textiles and nanomaterials