| Rheometric Studies on Cordierite-Mullite Precursor
Mix for Extrusion of Honeycomb Structures |
Seetu Chacko, Roy Johnson, B. P. Saha, I. Ganesh, M. Vijayakumar and Y. R. Mahajan
Pages : 119-124
DOI :10.1080/0371750X.2004.11012145 |
| Abstract |
| An attempt has been made to evaluate the rheological characteristics of a cordierite-mullite precursor oxides based dough with appropriate proportions of additives using an indigenously designed and fabricated capillary extrusion die coupled with a universal testing machine. Further, the pressure profile of the extrusion process was analyzed using Benbow’s paste flow model, which showed a clear dependence of die land region and negligible effect of die entry on extrusion velocity with respect to L/d ratios. The flow characteristics were also analyzed using power law model after incorporating Bagley’s entry correction. Viscosity-shear rate data show that the variation is towards Newtonian behaviour with a power law exponent of 0.63 for shear rates < 50 s–1, while at higher shear rates, it is distinctly non-Newtonian with a power law exponent of typically 0.31. |
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