Informatics Publishing Limited

Fang Shao ¹, Fa Zhang ¹, Zhijin Zhou ¹, Yunhai Wang ¹, Lihua Xiao ², Qingdong Qin ², Aijun Liu ¹

Affiliations
1 School of Mechanical Engineering, Guizhou Institute of Technology, Guiyang 550 003, CN
2 School of Materials and Metallurgical Engineering, Guizhou Institute of Technology, Guiyang 550 003, CN

Abstract

Cutting temperature always highly reaches over to 1000 o C during high speed machining with Al₂O₃ ceramic tools. Diffusion wear is the main wear mechanisms at such high temperature. In this paper, the rules of diffusion wear for Al₂O₃ ceramic tools are studied based on thermodynamics. Dissolution concentrations in typical normal workpiece materials of ceramic tool material at different temperature are then calculated. Diffusion reaction rules in high temperature are also analyzed using Gibbs free energy criterion, it was found that the theoretical results were uniform with the experimental data; and the diffusion solubility of Al₂O₃ ceramic tools is usually much smaller. The order of dissolution of Al₂O₃ ceramic tools in machining several typical normal workpieces is as follows: titanium> nickel> steel, At the same cutting condition, when machining cast iron and 35# steel, the wear performance of tools is very different and the wear mechanism should be researched more. The results will provide useful references for tool material design and selection.

Keywords

Thermodynamics Characteristics, Al₂O₃ Ceramic Tool, Tool Wear.

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