Torque evolution and effects on alumina feedstocks prepared by various kneading sequences
Resource
Journal of the European Ceramic Society 20 (1): 67-75
Journal
Journal of the European Ceramic Society
Journal Volume
20
Journal Issue
1
Pages
67-75
Date Issued
2000
Date
2000
Author(s)
Wu, Rong-Yuan
Abstract
The effects of different kneading sequences on the homogeneity, strength and Weibull modulus of green density and sintered parts were studied. Polypropylene (PP), paraffin wax (PW) and stearic acid (SA) in a mass ratio of 25:70:5 mass % were mixed with Al2O3 to produce feedstocks. Five different kneading sequences were implemented and analyzed using several techniques, including capillary and torque rheometries, Fourier transformed infrared spectroscopy (FTIR), differential scanning calorimetry (DSC) and pycnometry to reveal the properties of the feedstocks. Subsequently, the properties of injection molded samples subjected to the same solvent and thermal debinding conditions were observed. After sintering, the results of the fracture strength and Weibull modulus of Al2O3 strongly suggest that the kneading process closely control the homogeneity of feedstocks. The p3 process (kneading sequence, Al2O3->PP->PW) could produce the largest torque and homogeneous feedstock. The produced specimens showed the greatest average strength (371 MPa) and Weibull modulus (8.1).
Subjects
Al2O3; Injection molding; Kneading; Mechanical properties; Shaping
Other Subjects
aluminum oxide; injection molding
Type
journal article
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