Title: Self-lubricating behaviours of ceramic tools in dry cutting

Authors: Deng Jianxin, Yang Xuefeng, Liu Jianhua

Addresses: Department of Mechanical Engineering, Shandong University, Jinan 250061, Shandong Province, P.R. China. ' Department of Mechanical Engineering, Shandong University, Jinan 250061, Shandong Province, P.R. China. ' Department of Mechanical Engineering, Shandong University, Jinan 250061, Shandong Province, P.R. China

Abstract: An in situ reaction self-lubricating ceramic tool (i.e. Al₂O₃/TiB₂) and a self-lubricating ceramic tool with the addition of solid lubricants (i.e. Al₂O₃/TiC/CaF₂) were produced by hot pressing. The lubricating behaviour of these self-lubricating tools in dry cutting processes were studied. It was shown that self-tribofilms, which contributed to the decrease of the friction coefficient at the tool-chip interface, were consistently formed on the tool rake surface for these self-lubricating tools. The formation process and composition of these self-tribofilms were determined and the self-lubricating mechanisms were advanced. Cutting speed was found to have a profound effect on the self-lubricating behaviours. These self-lubricating tools can be used to reduce the friction coefficient between the tool-chip interface during dry cutting.

Keywords: ceramic cutting tools; lubrication; wear mechanisms; dry cutting; solid lubricants; hot pressing; self-lubrication; self-tribofilms; friction coefficient; cutting speed; tool-chip interface; machining.

DOI: 10.1504/IJMMM.2006.011066

International Journal of Machining and Machinability of Materials, 2006 Vol.1 No.2, pp.213 - 222

Published online: 06 Oct 2006 *

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