A NOVEL APPROACH TO UNDERSTANDING MICROWAVE HEATING OF ZIRCONIA

ABSTRACT Savings in processing time (up to 90%) and energy (20-80%) are expected in microwave sintering of ceramics, as this technology breaks through into industrial firing processes. Linn High Therm had developed a high temperature hybrid microwave system in anticipation of industries needs. Typically, silicon carbide susceptors are used to initiate heating from room temperature, where many ceramics have low dielectric losses. The loss increases with temperature, and at some "kick in" transition temperature, the ceramic load heats preferentially over the susceptors. In this work the effect of dopant type and crystal structure of zirconia on the "kick in" temperature was observed using silicon carbide susceptors

Synthesis of monodispersed silica powders II. Controlled growth reaction and continuous production process

Abstract Currently there are several models discussed to describe the formation of monodispersed silica particles by the controlled hydrolysis and condensation of tetraethylorthosilicate (TEOS

The characterization of macroporous solids: An overview of the methodology

a b s t r a c t This paper summarizes the principal aims, content and conclusions of a document recently submitted to IUPAC, as a Technical Report, by the IUPAC Working Group on ''Liquid intrusion and alternative methods for the characterization of macroporous materials'' and to be published in full in Pure and Applied Chemistry. The initial goal of the group was to list, examine and compare the methods presently used to characterize macroporous structures. In addition to mercury porosimetry, the most popular experimental techniques include the intrusion of various non-wetting and wetting liquids, capillary condensation, liquid permeation, imaging and image analysis. The statistical reconstruction of porous materials and the use of macroporous reference materials are also examined. A particular aim is to evaluate the status of mercury porosimetry, since the use of mercury raises a number of safety and environmental issues. The scope and limitations of each method are examined in the context of the scientific and technological requirements and the applicability of some new and unfamiliar methods is also discussed. Finally, an indication is given of the likely direction of future developments in the methodology of macropore characterization