Effects of pore structure in green compact on the microstructure of sintered electronic ceramics

压坯孔隙结构对烧结电子陶瓷微观结构的影响

• 批准号: 61550581
• 负责人: KIMURA Toshio
• 金额: $ 0.9万
• 依托单位: Keio University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1986
• 资助国家: 日本
• 起止时间: 1986 至 1987
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-61550581/
• 关键词: Sintering; Pore structure; Alumina; Ferrite; 酸化鉄

1. Pore structure and sintering behavior of alumina compacts were examined. The green compacts were made by slipcasting of suspensions with different pH. An increase in agglomerate size in the suspension increased pore volume and size in the green compact and reduced densification rate. The microstructure development was almost the same, irrespective of pore volume and size of the green compact.2. Monodispersed polymer particles were added to alumina powder and sintered to examine densification behavior of large pores. Pores less than 1 m in diameter shrank with a considerable rate and their shape changed from spherical to lenticular. Pores more than 2 <micr>m in diameter shrank slowly and their shape was maintained. The critical pore size for the alumina powder used in this experiment was about 1 <micr>m.3. Sintering behavior of pressed and extruded acicular NiZn-ferrite and iron oxide was examined. Anisotropic shrinkage was observed. Acicular particles changed to equiaxed ones upon heating but anisotropic pore structure was maintained until the intermediate stage of sintering. Grain orientation was observed for iron oxide during the final stage of sintering.

1. 研究了氧化铝致密体的孔隙结构和烧结性能。通过不同ph的悬浮液的滑投制备绿色致密体。悬浮液中团聚体大小的增加增加了绿色致密体的孔隙体积和大小，降低了致密率。无论孔隙体积和孔径大小如何，绿色压坯的微观结构发展几乎相同。将单分散聚合物颗粒加入到氧化铝粉末中，进行烧结，研究大孔隙的致密化行为。直径小于1 m的气孔以相当快的速度收缩，其形状由球形变为透镜状。直径大于2 μ m的气孔收缩缓慢，气孔形状保持不变。本实验使用的氧化铝粉的临界孔径约为1 <micr>m.3。研究了挤压和挤压针状nizn -铁素体与氧化铁的烧结性能。观察到各向异性收缩。加热后针状颗粒转变为等轴状颗粒，但各向异性孔隙结构一直保持到烧结中期。在烧结的最后阶段观察到氧化铁的晶粒取向。

项目成果

K.Omatsu: "Sintering of Acicular NiZn-Ferrite Powder" Ceramic Microstructure '86.

K.Omatsu：“针状镍锌铁氧体粉末的烧结”陶瓷微观结构86。

T.Kimura: J.Mater Sci.

T.Kimura：J.Mater Sci。

T.Kimura: Ceramics International.

T.Kimura：陶瓷国际。

K.Omatsu: Ceramic Microstructures'86.

K.Omatsu：陶瓷微结构86。

S.Ohama: J.Am.Ceram.Soc.

S.Ohama：J.Am.Ceram.Soc。