高強度多孔質窒化ケイ素セラミックスの機械加工性

概要

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A machinability of porous Si_3N_4 ceramics composed of columnar β-Si_3N_4 grains was evaluated by turning and milling with cemented carbide cutting tools to investigate a possibility of application of the porous Si_3N_4 to machinable ceramic use. The porosity and the flexural strength of specimens were about 43% and 270 MPa, respectively. The machinings were carried out with a cemented carbide throw-away tip of K-10 grade. The condition of turning was cutting speeds of 50 to 150 m/min, feed rates of 0.05 to 0.40 mm/rev, and a cutting depth of 0.5 mm, and that of milling was cutting speeds of 20 to 200 m/min, feed rates of 0.05 to 0.20 mm/rev and a cutting depth of 0.5 mm. Machinability was judged from the maximum surface roughness, R_<max>, after machining; it was defined that a material was machinable when R_<max> was below 10 μm. In the case of turning, the R_<max> increased with increasing cutting speed and feed rate. R_<max> below 10 μm was obtained under conditions that satisfied both a cutting speed of 50 m/min and feed rates below 0.1 mm/rev. In the case of milling, although the R_<max> increased with increasing feed rate, serious cutting speed dependence of R_<max> could not be seen. R_<max> values below 10 μm were obtained at feed rates below 0.1 mn/rev, independent of cutting speed.
社団法人日本セラミックス協会の論文
1998-11-01