Abstract
Cubic boron nitride (CBN) tool is one of the most extensively used tools in modern industrial processing and manufacturing. The service life of CBN tools has extraordinary significance for machining efficiency and surface finish of workpieces. Here, we investigated the tribological behaviors of CBN/Si3N4 pairs to simulate the process of CBN tools cutting ceramics and demonstrated that the use of optimal 0.02 wt% non-toxic and eco-friendly hexagonal boron nitride (hBN) aqueous solution as a water-based cutting fluid enabled to reduce the wear rate of CBN by ∼64%, and improve the material removal of Si3N4 by ∼13% compared to pure water lubrication. Further analysis indicated that the physical adsorption of hBN nanosheets played a dominant role in the lubrication at the sliding interface where the direct contact of interfacial asperities was separated and then the tribochemical reactions of CBN with water were suppressed. The results help in the development of environmentally friendly lubricants to match the requirements of mechanical processing for difficult-to-machine materials.
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