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。检查氧化铝紧凑型的孔结构和烧结行为。绿色的契约是通过对具有不同pH的悬架进行滑动而制成的。悬浮液中的团聚大小的增加增加了绿色紧凑型和致密速度降低的孔体积和大小。微观结构的发展几乎是相同的，无论毛孔体积和绿色紧凑型的大小如何。2。将单分散的聚合物颗粒添加到氧化铝粉中，并烧结以检查大孔的致密行为。直径小于1 m的孔缩小了相当大的速度，其形状从球形变为毛状。直径超过2 <micr> m以上的孔缓慢缩小并保持其形状。该实验中使用的氧化铝粉的临界孔径约为1 <micr> m.3。检查了压力和挤压的抗氧化二氮和氧化铁的烧结行为。观察到各向异性收缩。加热后，卵形颗粒变为等亚颗粒，但各向异性孔结构一直保持到烧结的中间阶段。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。

T. Kimura: "Effects of Agglomerates on the Sintering of Alpha-Al_2O_3" Ceramics International. 13. 27-34 (1987)

T. Kimura：“团聚体对 Alpha-Al_2O_3 烧结的影响”陶瓷国际。

T. Kimura: "Sintering of Acicular Fe_2O_3 Powders" J. Mater. Sci.

T. Kimura：“针状 Fe_2O_3 粉末的烧结”J. Mater。