Effect of powder, binder and process parameters on anisotropic shrinkage in tape cast ceramic products
Effect of powder, binder and process parameters on anisotropic shrinkage in tape cast ceramic products
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DOI：
10.1016/j.jeurceramsoc.2010.08.012
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发表时间：
2010-12
影响因子：
5.7
通讯作者：
A. Heunisch;Armin Dellert;A. Roosen
中科院分区：
文献类型：
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作者：
A. Heunisch;Armin Dellert;A. Roosen
研究了粉末、粘结剂和工艺参数对铸造氧化铝带性能和各向异性收缩率的影响。使用具有不同颗粒形状（片晶、球形、标准）的三种氧化铝粉末和具有不同链长的三种PVB粘合剂。此外，改变铸造速度和叶片间隙高度。通过显微照片的图像分析定量检测带中颗粒的取向。片状粉末的收缩各向异性大于12%，标准粉末的收缩各向异性大于8%，而球形颗粒导致几乎各向同性的收缩。有机粘合剂链长的影响被证明是轻微的颗粒形态的影响相比。在所研究的工艺参数范围内，拉速和叶片间隙高度的变化对各向异性收缩没有影响。这是解释的剪切流体中的粒子旋转的理论考虑。
The effect of powder, binder and process parameters on the properties of cast alumina tapes and their anisotropic shrinkage were investigated. Three alumina powders with different particle shapes (platelets, spherical, standard) and three PVB binders with different chain lengths were used. In addition, casting velocity and blade gap height were varied. The orientation of the particles in the tape was detected quantitatively by image analysis of micrographs. The shrinkage anisotropy is more than 12% for the platelet shaped powder and 8% for the standard powder, whereas the spherical particles lead to almost isotropic shrinkage. The influence of the organic binder chain length proved to be minor compared to the influence of the particle morphology. The variation of casting speed and blade gap height has no effect on anisotropic shrinkage in the investigated parameter range. This is explained by theoretical considerations of particle rotation in a sheared fluid.