Binder removal studies in ceramic thick shapes made by laminated object manufacturing

Das, Anirban and Madras, Giridhar and Dasgupta, Niladri and Umarji, Arun M (2003) Binder removal studies in ceramic thick shapes made by laminated object manufacturing. In: Journal of the European Ceramic Society, 23 (7). pp. 1013-1017.

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Abstract

Binder removal was studied in a body of alumina made by Laminated Object Manufacturing (LOM) with polymethyl methacrylate as binder, benzyl butyl pthalate and polyethelene glycol as plasticisers and glyceryl trioleate as dispersant with an optimized solids loading of 58% by volume. The burnout of the organics from laminated cuboids of di.erent thickness was carried out in nitrogen atmosphere at di.erent temperatures between 200 and $300 ^{o}C$. The variation of the organic content from the core to the surface was also determined by thermogravimetric analysis (TGA) and FTIR studies. The organic content of the body at a particular temperature exposed for a particular time was modeled based on the parameter,$ S (\proptoD_ff/l^2)$ where De. is the e.ective diffusivity and l is the di.usion path length. The variation of S as a function of exposed surface area per unit volume of the cuboids is linear. Since the dependence of S on temperature follows an Arrhenius behaviour, the value of S can be predicted at any temperature and for any exposed surface area per volume of the cuboids. Thus the model can be used to estimate the organic content of the body exposed for a certain duration at a particular temperature.

Item Type:	Journal Article
Publication:	Journal of the European Ceramic Society
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Keywords:	Al2O3;Binder removal;Laminated object manufacturing.
Department/Centre:	Division of Chemical Sciences > Materials Research Centre Division of Mechanical Sciences > Chemical Engineering
Date Deposited:	05 Dec 2008 07:20
Last Modified:	19 Sep 2010 04:52
URI:	http://eprints.iisc.ac.in/id/eprint/16604

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