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Machinability and scratch wear resistance of carbon-coated WC inserts

机译：碳涂层WC刀片的可加工性和耐刮擦性

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摘要

In this work, cemented tungsten carbide (WC) inserts were coated with nanocarbons/carbides by chemical vapor deposition (CVD) and their machinability and scratch wear resistance were investigated. The hardness and surface conditions of the WC substrate were studied before and after coating. The CVD-generated nanocarbons on the insert surfaces were examined by SEM, FE-SEM and TEM. The electron microscopic images revealed that the carbons generated were multi-walled carbon nanotubes (MWC-NTs) or carbides depending on the experimental conditions. In both the cases, the cutting edges of the inserts had dense deposits. Scratch wear test with the coated inserts showed that the co-efficient of friction was 0.1 μ as against 0.2 μ for the uncoated inserts under a ramp load of 1-13 N. The machinability characteristics of commercially available TiCN-coated inserts and the carbon-coated WC inserts were compared by using a CNC machine and a Rapid Ⅰ vision inspection system. It was found that the carbide-coated inserts exhibited machinability with better surface finish comparable to that of the TiCN-coated inserts while the MWCNT-coated inserts showed inferior adhesion properties.
机译：在这项工作中，硬质合金碳化钨（WC）刀片通过化学气相沉积（CVD）涂覆了纳米碳/碳化物，并研究了它们的可机械加工性和耐刮擦性。在涂布前后研究了WC基材的硬度和表面条件。通过SEM，FE-SEM和TEM检查了在插入物表面上由CVD产生的纳米碳。电子显微镜图像显示，取决于实验条件，所产生的碳是多壁碳纳米管（MWC-NTs）或碳化物。在两种情况下，刀片的切削刃都有密集的沉积物。涂层刀片的划痕磨损测试表明，在1-13 N的斜升载荷下，摩擦系数为0.1μ，而未涂层刀片的摩擦系数为0.2μ。市售TiCN涂层刀片和可切削碳纤维的切削性能使用CNC机器和RapidⅠ视觉检测系统对涂层的WC刀片进行比较。发现与碳化钛涂层的刀片相比，碳化物涂层的刀片显示出可加工性和更好的表面光洁度，而碳纳米管涂层的刀片显示出较差的粘合性能。

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