セラミックスの放電加工 (第2報)

β-サイアロン-窒化チタン複合焼結体の放電加工

抄録

Electroconductive sialon-titanium nitride ceramic composite was machined with the electro-discharge machining method. Surface damage caused during machining in machined members was evaluated with the three point bend test. The machined and fracture surface were observed with a scanning electron microscope (SEM). The effects of machining conditions on the surface damage were discussed. Heat treatment of machined members was carried out in air for recovering their strength. Effects of the pulse duration and duty factor on the strength of machined members were noticiable. The flexural strength of machined member increased with decreases in pulse current and duty factor. Annealing in air had a good effect on the strength of a machined member. The highest strength of machined member attained after annealing was 856MPa, which was about the average flexural strength of the original body.