CLEARCERAM®-Z
is a glass-ceramic with an Ultra-Low Thermal Expansion Coefficient.
This material was developed by Ohara based on our knowledge of High
Homogeneity melting and Precise Crystallization. This material is
produced under tightly controlled conditions and offers outstanding
thermal, mechanical and chemical properties. There are two versions of
CLEARCERAM®-Z available based on thermal expansion differences; Regular
and CCZ-HS.
Key Properties of CLEARCERAM®-Z
Ultra-Low Expansion Glass
The
material shows almost Zero Thermal Expansion over a wide temperature
range and offers superior thermal shock resistance. CCZ Regular offers
lower thermal expansion across a wide temperature range, while the
CCZ-HS offers lower thermal expansion near room temperature.
Superior Mechanical Properties
The
material is comprised of approximately 70% ceramic, which makes the
mechanical characteristics superior to regular amorphous glass when
comparing properties such as Young's Modulus, Rigidity, Bending
Strength and Hardness.”
Superior Machinability
The
crystal grain structure of the material prevents the propagation of
micro crack caused in between machining process. This property allows
the material to be processed into various shapes with high accuracy,
with ease of machinabilty and elevated yield rates.
Excellent Chemical Properties
The
material has very high chemical durability and is very stable in
various cleaning and thin-film coating processes. CLEARCERAM®-Z does
not contain Na, K, B, F, and Pb in its composition which is a main
reason for excellent chemical resistance the material displays.
Applications for CLEARCERAM®-Z (Ultra Low Expansion Glass)
ClearCeram-Z
material is used as parts of semiconductor steppers, parts for liquid
crystal steppers, optical flats, spacers, windows, parts for
interferometers, laser refraction mirrors and suspensions, astronomical
telescope mirrors, various disks, block gauges, standard lengths, long
precision scales, optical pedestal platforms, pedestal for precision
equipment, alternate material to quartz glass, ceramics, low thermal
expansion alloys, etc.
Please contact us for additional details about our Ultra Low Expansion Glass Ceramics.
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‘Laser Focus World – December 2008’
The LSST mirror [made from Ohara E6 glass] has been cast and is ready
for grinding and polishing. The outer 5.0 to 8.4 meter diameter portion
will serve as the primary mirror; the inner 5.0 meter diameter portion
will be ground to a steeper curvature and will become the telescope’s
tertiary mirror. (Courtesy of Laser Focus World and the University of Arizona)
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