Effect of pore orientation on anisotropic shrinkage in tape-cast products
Effect of pore orientation on anisotropic shrinkage in tape-cast products
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DOI：
10.1016/j.jeurceramsoc.2014.03.002
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发表时间：
2014-09
影响因子：
5.7
通讯作者：
Zongwen Fu;Armin Dellert;Marita Lenhart;A. Roosen
中科院分区：
文献类型：
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作者：
Zongwen Fu;Armin Dellert;Marita Lenhart;A. Roosen
在流延过程中，可以观察到各向异性收缩，这归因于流延过程中的颗粒对齐。了解绿色坯体微观结构与收缩各向异性之间的关系对于多层陶瓷的进一步小型化具有重要意义。在目前的研究中，四种不同的颗粒形状（球形，标准，板状和极端板状）的氧化铝粉末被用来铸造绿色带。分析了烧结收缩行为和显微组织。特别地，通过使用改进的线性截距法定量地确定孔取向。在所有三个空间方向上讨论了铸造绿色带的孔隙排列和各向异性烧结收缩之间的关系。收缩各向异性可以与孔隙各向异性定量相关。此外，通过基于细长颗粒和孔隙的数学建模来验证这种相关性。
During tape casting, an anisotropic shrinkage can be observed, which is attributed to particle alignment during the casting process. The understanding of the relationship between green body microstructure and shrinkage anisotropy is of great importance for further miniaturization of multilayer ceramics. In the current study, four alumina powders with different particle shape (spherical, standard, plate-like and extreme plate-like) were used to cast green tapes. The sintering shrinkage behavior and the microstructure were analyzed. In particular, the pore orientation was determined quantitatively by using a modified linear intercept method. The relationship between pore alignment and anisotropic sintering shrinkage of cast green tapes is discussed in all three spatial directions. The shrinkage anisotropy could be correlated quantitatively with the pore anisotropy. Furthermore, this correlation was verified by mathematical modeling based on elongated particles and pores.