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February
Bauxite
Porcelain: A New High-Tech Product for High-Voltage Insulation
Traditional alumina porcelain high-voltage insulators
can be replaced by less-expensive bauxite porcelain insulators
without loss of strength. Johannes Liebermann and Wolfgang Schulle
Characterizing Glaze-Melting Behavior via HSM
Hot-stage microscopy has been used successfully to characterize
glaze-melting behavior. M. Ahmed and D.A. Earl
May
Clayware Mechanical Properties Porosity Dependent
Porosity correlates closely to the mechanical properties
(hardness, strength and elastic constant) and Weibull
modulus of roofing tile, and empirical relationships
have been obtained. H.S. Kim, T. Guifang and J.Y. Kim
How
Active Silica Affects Slip Properties of Sanitaryware
To show the effect of active silica on slip rheology
and casting properties, active silica derived from rice
husks was used as a replacement for quartz in the production
of sanitaryware. The replacement significantly increased
slip viscosity and casting rate. E. Özel, S. Kurama and N. Ay
Manufacturing
Briefs
Emissions Control for the Brick Industry
June
Electric Behavior of Porcelain Insulators in Polluted Environments
Organic protective layers on normally hydrophilic inorganic
surfaces of silica insulators converts them to hydrophobic
low-energy surfaces and prevents the formation of critical
water films caused by nonpolar molecular groups. J. Liebermann
Ceramic Floor-Tile Kiln
Fluoride Emission Factors
Results of a study of atmospheric fluoride stack-gas emission
factors from a fast-fired floor-tile kiln are reported. Tuncay Dageroglu and Serap Kara
Addition of Quartz to Fast-Fired Wollastonite-Based Wall
Tile
Effects of increased quartz on the physical properties and
microstructure of a wall-tile body were verified. A. Ibañez and F. Sandoval
Two-Step Firing of Phosphate-Modified Whiteware
Addition of phosphate to whiteware compositions improved
their whiteness. A two-step firing regime enhanced the crystallization
of various phases and improved their properties. Addition of
magnesium fluoride decreased the maturing temperature and shortened
the maturing time. D.M. Ibrahim and A.A. Mostafa
Using Surface Area
to Solve a Mixing Problem
Specific surface area measurements were used to determine
the relative amounts of flint and nepheline syenite in batch
amounts obtained from a storage silo in which the two materials
had been accidentally mixed. Nikolas Ninos and William M. Carty
Size, Shape and Structure Analysis of Fine Particles
A new static laser light measurement technique allows
characterization of submicron- and nanoscale-sized ceramic
particle shape and structure as well as particle size and
particle-size distribution. S. Manickavasagam, M.P. Mengüç, Z. Drozdowicz and C.
Ball
Fluoride Emission Factors for Ceramic Wall-Tile Kilns
Fluoride emissions from ceramic wall-tile industries are
measured, and predicted emission factors are determined. Tuncay Dogeroglu and Serap Kara
Basic Geology
and Chemistry of Borate
Few Commercially important borate mineral deposits are
known, and their genesis is associated with boron transport
to the earth's surface in geothermal waters associated with
volcanic activity. The chemistry and behavior of boron in
earth geological processes important to the genesis of these
commercial deposits are reviewed. Robert A. Smith
Evaluation of
a Commercial Ball Clay Deposit
The evaluation of commercial exploitation of a ball clay
deposit is dependent on geology and controlled by the characteristics
of the clay, the mining method and the quality control techniques
used. Caroline Echlin
September
Controlling Glaze Surface Effects
Variations in gloss, texture and crystal concentrations
over the surface of a glaze can improve its aesthetics. Richard A. Eppler
Polishing
Porcelain Tile, Part 1: Wear Mechanism
Exhaustive sampling has been accomplished along the length
of an industrial porcelain-tile polishing line to determine
the changes that result in the tile surface during the polishing
operation. E. Sánchez, J. García-Ten, M.J. Ibáñez, M.J. Orts,
V. Cantavella, J. Sánchez and C. Soler
Characterization of RCP Glaze System
Two rutile-calcium phosphate glaze systems with different
quantities of rutile were prepared and analyzed. a-cristobalite,
a-zinc titanium oxide and hydrocalumite were the common crystalline
phases identified. They had higher rutile content and, hence,
higher opacity and whiteness. M. S. Fofanah, Wu Qi Jiu and Zhuang Zhiqiang
October
Stain Resistance of Porcelain Stoneware
Tile
Color measurements quantify the amount of stain on the working surface of
porcelain stoneware tile. Leonardo Esposito, Antonella Tucci, Eugenia Rastelli, Carlo Palmonari and
Serlio Selli
November
Using the Optical Dilatometer to Determine Sintering Behavior
The double-beam optical dilatometer is the ideal instrument to determine the
temperature at which a ceramic body achieves full vitrification. Mariano Paganelli
SATRA Tests Homeware
A series of test routines are designed to give realistic predictions of normal
service performance and safety of homeware. Tony Smith
What Is My TC Really Telling Me?
Basic knowledge about the operation, standardization, application and sources
of error of thermocouples can prevent loss of a process or damage to equipment. Fred C. Dimock
Deflocculant Capability of Sodium TPP
The Rietveld method is a valid characterization analysis tool to facilitate
the selection of an appropriate tripolyphosphate (TPP) for a specific application. F. Bondioli, M. Ferrari and P Miselli
Natural Red Pigment for Single-Fired Ceramic Glazes
Proper extraction and postextraction treatment of Grès
de Thiviers natural raw material provide a high-quality
natural product that can be competitively used as a red
pigment for single-fired glazes. Alessandro F. Gualtieri
Polishing Porcelain Tile, Part 2: Influence of Microstructure
and Microhardness
The results of a study on the effect of quartz content
and particle size on wear mechanisms involved in porcelain-tile
polishing and end quality (gloss). E. Sánchez, J. García-Ten, M.J. Ibáñez, M.J. Orts,
V. Cantavella, J. Portolés and J. Sales
