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슬러리 분무열분해에 의한 초미립 티탄산 바륨 분말 제조
이종호,허강헌,이정수 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.2
A remarkable improvement of the productivity in barium titanate by slurry spray pyrolysis process was realized by supplying solid source slurry into the rector. The produced barium titanate powders showed uniform powder properties, and reproducibility with higher tetragonality in the range of 80~200 ㎚, case by case. The secondary calcination experiments of the as-prepared powders by spray pyrolysis revealed that the powders as-prepared over 700℃ showed perfectly different behavior with the lower temperature’s ones and the solid state reaction’s case. The result was discussed in terms of the reaction mechanism based on the activation energy analysis. A remarkable improvement of the productivity in barium titanate by slurry spray pyrolysis process was realized by supplying solid source slurry into the rector. The produced barium titanate powders showed uniform powder properties, and reproducibility with higher tetragonality in the range of 80~200 ㎚, case by case. The secondary calcination experiments of the as-prepared powders by spray pyrolysis revealed that the powders as-prepared over 700℃ showed perfectly different behavior with the lower temperature’s ones and the solid state reaction’s case. The result was discussed in terms of the reaction mechanism based on the activation energy analysis.
X-선 회절법에 의한 집합조직을 갖는 60 Cu-40 Zn 황동의 구성상 부피분율 측정
이동녕,허강헌 대한금속재료학회(대한금속학회) 1987 대한금속·재료학회지 Vol.25 No.10
A study has been made of a X-ray method for measuring the volume fractions of component phases in α+β' brass sheets and α+ β' Pb brass rods having textures. Taking into account only one reflection intensity from each phase leads to serious errors in results regardless of the textures. Five or six lower index reflections from each phase have to be taken into account to achieve satisfactory results.