1999
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January
Profiles
in Ceramics: W.D. Kingery
Father of Modern Ceramics
W. David Kingery, often called the Father of Modern Ceramics,
is the first in a series of profiles of individuals who have made
significant contributions to the ceramics industry through either
scientific, engineering, or product and/or market development.
Kathy
L. Woodard
Chemical
Delamination of Kaolin
Delamination of kaolin stacks has been achieved by intercalating
kaolin with KC2H3O2 prior
to subjecting the expanded complex to some sort of mechanical grinding.
KC2H3O2 intercalation
is easy and spontaneous under the proper conditions.
Chris
B. Maxwell and Prakash B. Malla
Manufacturing
Briefs:
Refractory
Material Takes the Heat, Withstands the Shock
Foundry restores furnace efficiency, recoups capacity
with eductor block made of an advanced refractory material from Plibrico.
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February
Thermal
Conductivity of Gelcast Porous Alumina
Authors describe the thermal conductivity of porous bodies processed
by two different fabrication/processing techniques: foaming ceramic
suspensions (gelcast) prior to setting and dry-pressing and bisque
firing at various temperatures.
Pilar Sepulveda, Wilson N. dos Santos, Victor C. Pandolfelli,
José C. Bressiani and Roy Taylor
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March
Applying
MPT Principle to High-Alumina Castables
Maximum paste thickness (MPT) parameter is used to determine
the correlation between refractory castable flowability and the
particle packing model.
P. Bonadia, A.R. Studart, R.G. Pileggi, V.C. Pandolfelli and
S.L. Vendrasco
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May
Changing
the Face of the Global Refractories Industry
Recent changes in process technology have led to a significant
reduction in MgO-C brick consumption. This article examines
present-day refractories, their applications and markets,
and projects some foresight into the new century.
Subrata Banerjee and Thomas Abraham
Pilkington 3R Process:
A Refractory Perspective
Experience shows the concern that the combination of
reducing conditions and high temperatures in the 3R™ Process
would have deleterious effects on the furnace refractory
structure is unfounded.
Ian Shulver
Rheological Design of Zero-Cement Self-Flow Castables
The growing application and demand for refractory castables
as an alternative to conventional refractory brick is driving
researchers and producers alike to investigate the special
characteristics and properties of these monolithic products.
A.R. Studart, W. Zhong and V.C. Pandolfelli
Effect of Electrolytes on Sanitaryware Slip
Slip viscosity is used widely in controlling ceramic
casting slip. The viscosity of slip changes with the amount
and type of electrolyte.
Emel Özel, Nuran Ay and Ersan Pütün
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July
Energy
Use and Efficiencies in Firing Ceramics, Melting Glass
The energy consumption of 45 kilns and furnaces and their
efficiencies were compared with previous data. Many cases
indicate improvements as a result of furnace design, use
of oxygen and new refractories.
O.J. Whittemore
High-Temperature Properties of Refractory Composites
High-temperature properties have been studied for oxide-nonoxide
composites. Results indicate superior hot strength over carbon-bonded
materials, an increase in shock resistance (nonoxide added
to oxide matrix) and an improvement in oxidation resistance
(oxide added to nonoxide matrix).
Xiangchong Zhong and Hailei Zhao
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August
The
Colloidal Nature of Kaolinite
Because production of whitewares most frequently begins
in the slurry stage, understanding the colloidal nature of
kaolinite is critical to developing a well-controlled, repeatable
process. This article proposes that kaolinite particles possess
a dual basal surface nature. It further establishes a basis
for the evaluation of observed dispersant and rheology data
for kaolin suspensions. William M. Carty
Optimizing Particle Packing in Powder Consolidation
A number of techniques exist to shape powders-dry pressing,
injection molding, extrusion and slip casting are the most
common. Depending on the method used to pack the particles,
the factors that determine the final properties of the consolidated
powder differ. Optimizing powder packing by designing specific
particle size distributions yields significant benefits to
ceramic processes and products.
F.S. Ortega, R.G. Pileggi, P. Sepulveda and V.C. Pandolfelli
Use of Silicon Residue in Ceramics and Glass
Silicon residue from the Geothermal Center of Cerro
Prieto is, in theory, suitable for use as raw material for
the production of ceramics and glass. Once the silica residue
is purified through a simple process of aqueous leaching,
it provides a silica that has proved fit for use in the formulation
and production of three materials (traditional ceramic, low-fire
ceramic and lead glass).
C. Diaz and F.J. Valle-Fuentes
Annual Minerals Review
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September
The
Permeability of Ceramic Foams
Incomplete and often conflicting information about the
permeability of ceramic foams is found in the literature.
Only a limited number of works have looked at the combined
effects of fluid compressibility, viscous and inertial losses
and structural parameters.
M.D.M. Innocentini, V.R. Salvini, V.C. Pandolfelli and
J.R. Coury
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October
New
Developments in Kiln Technology
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November
Profiles
in Ceramics: George MacZura
George MacZura spent four decades with Alcoa, where
he made an impact on the ceramics and refractories industries
with his role in developing the process and marketing of
reactive aluminas, as well as for the development of tabular
aluminas and CA-25 calcium aluminate cements.
Kathy L. Woodard
Thermal Analysis Update
This update offers a sampling of the types of instrumentation
currently available for the thermal analysis process.
Laser Particle Size Analysis:
A Tool for Designing Traditional Ceramic Processes
Simply by using modern analysis techniques based on light
scattering, it is possible to check the characteristics of
raw materials or semi-finished products, to impose production
control in various stages of the process or to intervene
to solve production problems.
M. Hanuskovà, T. Manfredini and M. Romagnoli
How Accurate is Darcy's Law for Refractories
The approach used to obtain permeability data affects
the interpretation of results. The use of Darcy's law and
Forchheimer's equation are compared.
M.D.M. Innocentini, A.R.F. Pardo, V.R. Salvini and V.C.
Pandolfelli
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December
Isofrax,
A New Soluble High-Temperature Fiber
Chemical and physical properties of Isofrax™, a
lung-soluble alternative to refractory ceramic fiber, are
described.
B.K. Zoitos and P.M. Boymel
NDE: Needs, Opportunities in Ceramic Processing
A new generation of process development tools is needed
to provide a better, fundamental understanding of defect
evolution during processing, tools that involve the combined
use of manufacturing process simulations and NDE.
C.H. Schilling and J.N. Gray
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November
Natural Fibers as Drying Additives for Refractory Castables
R. Salomão, C.S. Isaac and V.C.
Pandolfelli
Materials Engineering Dept., Federal University of São Carlos, São
Carlos, S.P., Brazil
The low cost and superior performance of natural fibers as drying additives make
them a promising substitute for synthetic fibers. View Article |
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