パルス通電焼結中の表面反応に与える炭素蒸着の影響

概要

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The effects of pulsed electric current sintering(PECS)on the surface reaction of carbon-coated Si_3N_4 powder were studied. The carbon-coated Si_3N_4 powder was heat-treated at 1500℃ in N_2 atmosphere for 0-60 min. During the heat treatments, the carbon reacted with oxidation layer on the Si_3N_4 powder surface, and formed SiC and CO gas. By measuring the content of residual carbon, the rate constant was obtained and compared with that of hot press(HP)sintering. It was found that PECS promoted the reaction about 3 times faster than HP. However, the reaction rate of PECS became the same rate as that of HP sintering when the carbon-coated Si_3N_4 was placed between insulating BN pellets with 2 mm in thickness. Therefore, it is concluded that the promotion of the reaction in PECS method is caused by the electric conduction through carbon coated layer on the surface of the raw Si_3N_4 powder.
社団法人日本セラミックス協会の論文
1998-05-01