片状黒鉛鋳鉄を旋削加工した窒化ケイ素切削工具の表面分析

概要

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Wear behavior of silicon nitride(Si_3N_4) ceramic tools in turning gray cast iron was evaluated. Wear of the flank and rake faces decreased with increasing cutting speed in a range of 100 to 300 m/min. Deposits on the rake and flank faces after cutting 3.3 km were analyzed by electron probe microanalysis(EPMA) and X-ray photoelectron spectroscopy(XPS). When the cutting speed was 300 m/min, surface deposits consisting of Mn, S, Al, and O were detected by EPMA. In contrast, little Al and O were found on the tool surface at a cutting speed of 100 m/min. Similar results were obtained for the flank face by EPMA. The rake face of the tool after cutting at 300 m/min was analyzed in detail by XPS. It was determined that the main contents of the surface deposits were Al_2O_3 and silicon oxide (SiO_2 and SiO_x);the layer was 1 to 2 μm in thickness. It was revealed that the oxide deposits prevented direct contact between silicon nitride cutting tool and the workpiece. This worked to improve tool life when turning of gray cast iron at a high cutting speed.
社団法人日本セラミックス協会の論文
1999-06-01