De-Agglomeration Kinetics of Feedstocks with Granule Tetragonal Zirconia Polycrystalline Powder
Resource
Journal of the American Ceramic Society 88 (7): 1734-1739
Journal
Journal of the American Ceramic Society
Journal Volume
88
Journal Issue
7
Pages
1734-1739
Date Issued
2005
Date
2005
Author(s)
Wu, Rong-Yuan
Abstract
This study establishes the relationship between homogeneity of tetragonal zirconia polycrystalline (TZP) feedstocks and the kneading time in order to understand the kneading energy adsorption during the de-agglomeration period of pre-existing ceramic granules. Two spray-dried Y-TZP powders with different compress strengths were investigated using torque rheometer and transmission optical microscopy. Several properties, kneading torque ( T), Casson viscosity (μ), Reynolds number (Re), and dispersive index (D s) of the feedstocks were introduced, and monitored as a function of kneading time. Optimal processing windows were identified from the dependence of dispersive index with a power number (N p). The best shear-kneading procedure was proposed in consideration of best feedstock homogeneity and shortest kneading time. One homogenous feedstock and two comparable cases were prepared for subsequent injection molding, debinding, sintering, and mechanical testing. The fracture strength of sintering parts by a partially homogeneous feedstock can be improved from 520 to 680 MPa by a homogeneous feedstock.
Other Subjects
Ceramic granules; De-agglomeration kinetics; Kneading time; Tetragonal zirconia polycrystalline (TZP) feedstocks; Agglomeration; Ceramic materials; Granular materials; Polycrystalline materials; Powders; Reaction kinetics; Zirconia
Type
journal article
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