結晶粒子が配向した立方晶フェライト焼結体の作成について

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Cubic polycrystalline ferrites in which {111} planes of the grains preferably orientated to the perpendicular direction to the axis of hot-pressing load were obtained. The plate-like iron oxide powder (Teikoku-kako Co., Ltd., MIO) of which the flat surfaces are made of c-plane were mixed with nickel oxide, manganese oxide and zinc oxide of ordinary powder shape. The slurry of these raw materials was pressed in a mold with many drilled holes in the pistons permitting permeable pressing. In the pressed body, the plate-like iron oxide powder orientated fairly well to the perpendicular direction to the pressing axis. After the green body was hot-pressed at 1200°-1300°C and 300kg/cm2 for 30 minutes, the orientation degree f of the grains in the hot-pressed ferrite polycrystal was determined by using (hhh) and (hkl) reflection intensities of X-ray from the outer surface perpendicular to the hot-pressing direction. The orientation degree f of the hot-pressed pellet in both Ni-Zn and Mn-Zn ferrite was only 0.05-0.3, in spite of the fact that the grains in the pellet kept the plate-like shape and the orientation of the iron oxide. After the annealing of the hot-pressed body at a higher temperature than the hot-pressing temperature, f of the grains was remarkably increased. Especially, Mn-Zn ferrite with f higher than 0.8 was easily obtained, probably as the result of the recrystallization grain growth from the stressed grains of plate-like shape in the hot-pressed body to the stress-free ones of equiaxial shape.
社団法人日本セラミックス協会の論文
1975-03-01

結晶粒子が配向した立方晶フェライト焼結体の作成について

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