耐火物級β型窒化ケイ素粉末及びその焼結体の諸特性に及ぼすボールミル時間の影響

概要

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Y_2O_3-doped low purity β-Si_3N_4 powder was ball-milled for 6 to 100h. The effects of ball-milling time on the properties of the powder and the hot-pressed body were investigated. As increasing ball-milling time, average particle size and crystallite size decreased and the amount of SiO_2, carbon, some metallic impurities and lattice strain increased for the ball-milled powder. The increase of SiO_2 was ascribed to the mechanochemical reaction of H_2O contained in the milling fluid with newly formed powder surfaces. The source of carbon was both the milling fluid and the container. The increase of Al and Mg was explained by the wear of milling balls. Sintering behavior and microstructure of the sintered bodies were influenced by the powder properties modified by different ball-milling time. Mechanical properties were strongly dependent on their microstructures.
社団法人日本セラミックス協会の論文
1996-04-01