Refractories and Industrial Ceramics Vol. 47, No. 2, 2006 UDC 666.3 STRUCTURAL EVOLUTION IN CERAMICS TECHNOLOGY AND PROCESSING 2 2 A. V. Belyakov and V. S. Bakunov Translated from Novye Ogneupory, No. 2, pp. 55 – 62, February, 2006. Original article submitted September 2, 2005. The next technological process is preparation of the tion (small internal friction, low apparent viscosity) during molding mix, which involves the mixing of powders of vari- molding; however as soon as shaped, the material should im- ous dispersities and compositions, introduction of a sacrifi - prove substantially these properties. cial bond, and granulation. When mixed, the particles tend to We now consider three main molding techniques in order lower their surface energy by combining with each other or of increasing the amount of bond required: semi-dry press- with the bond. This behavior prevents a uniform distribution ing, plastic molding, and casting. of constituents and is undesirable. The granulation of highly In semi-dry pressing, the required amount of bond is dispersed powders requires special conditions to be efficient. minimum, which, however, necessitates a larger amount of This is achieved through self-organization (a principle under- energy for molding. In a powder treated by pressing, locally lying
Refractories and Industrial Ceramics – Springer Journals
Published: Aug 26, 2006
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