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General
- Cordierite
(mineralogy) or iolite (gemology) is a magnesium iron aluminium
cyclosilicate.
- Cordierite
typically occurs in contact or regional metamorphism of argillaceous
rocks.
- Two common
metamorphic mineral assemblages include
sillimanite-cordierite-spinel and cordierite-spinel-plagioclase-orthopyroxene.
- Cordierite most
important feature is that it has a very low coefficient of thermal
expansion and excellent resistance to thermal shock.
- Cordierite was
known and used as a gemstone in Sri Lanka.
Production
Process
- Cordierite
materials and others based on it are magnesium aluminosilicates,
fabricated by sintering soapstone or talcum with the addition of
clay, kaolin, fireclay, corundum and mullite.
- Cordierite can be
made in high volume through cost-effective extrusion or dry-pressing
methods.
- Cordierite is a
common constituent in contact metamorphosed argillaceous or
arenaceous sediments and in regionally metamorphosed settings where
it occurs only in high grade gneiss.
- The dumortierite-bearing
cordierite-orthoamphibole rocks occur as thin layers and lenses in
the upper-amphibolite facies area of the central part of the Bamble
Sector.
Applications
- Cordierite diesel
particulate filters provide an economical approach to diesel
emissions control.
- Cordierite
honeycomb monoliths of square channels (Corning, 400 cps, 0.17 mm
average wall thickness) were used as substrates for the Preparation
of Washcoated Monolith.
- Indialite, the
rare high-temperature hexagonal form of cordierite. Synthetic
hexagonal cordierite is often found in glass ceramics and has a wide
range of technical applications.
- Synthetized
cordierite was used as a refractory filler in the ceramic layer for
evaporative polystyrene patterns in the new casting technology, Lost
Foam Process.
Market
- Cordierites have
low coefficients of thermal expansion and excellent resistance to
thermal shock. They offer a range of thermal expansion,
mechanical strength and porosity criteria. They excel as
cost-effective extruded and dry-pressed forms.
- 447 offers
excellent thermal shock resistance with high continuous porosity,
suitable for applications such as welding tile.
- 547 offers very
good thermal shock resistance with improved flexural strength due to
its semivitreous properties. It is able to withstand rapid
temperature fluctuations, such as those found in oil burner
applications.
- 701 also offers
very good thermal shock resistance, good flexural strength and 0-1%
porosity due to its vitrified properties. This cordierite can
self-glaze. It is suitable for applications such as commercial
heater supports.
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Production
Process, Technology, Applications, Patent, Consultants, Company Profiles,
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