CORDIARITE
GROUP | Gc. cordierite | |||
Product code | Gc-mull | Gc-cord | Gc-Al-cord | |
FEATURE OF COMPOSITION | Mullet | Cordarite | Cordarite & Alumina | |
APPLICATION RANGE | Good resistance to thermal shock, good refractoriness suited for heating elements. | Good resistance to thermal shocks especially suited for thermal and thermo electrical applications. | Good mechanical strength, high refractoriness, excellent resistance to thermal shocks, especially suited for thermal and thermo electrical applications. |
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Mullite is an excellent material due to its high temperature stability, strength and creep resistance. It is similar to Cordierite, although it is not as good an insulator and has a higher coefficient of thermal expansion. It is commonly used in heater exchange parts and electrical insulators.
General | |||
Property | ASTM Method | Units | Mullite |
Color | – | – | Gray – Tan |
Water Absorption | C 20-97 | % | 0 |
Mechanical | |||
Property | ASTM Method | Units | Mullite |
Density | C 20-97 | g/cc | 3.00 |
Hardness | Vickers 500 gm | GPa (kg/mm | 10 (1000) |
Flexural Strength (MOR) (3 point) @ RTº | F417-87 | MPa (psi x 103) | 206 (30) |
Compressive Strength @ RTº | – | MPa (psi x 103) | 1034 (150) |
Thermal | |||
Property | ASTM Method | Units | Mullite |
C.T.E., 25 – 100°C | C 372-96 | x10-6/°C | 3.6 |
C.T.E., 25 – 600°C | C 372-96 | x10-6/°C | 4.8 |
Thermal Conductivity @ RTº | C 408 | W/m-K | 4 |
Max Use Temperature (Non-Loading)
(at high strength) |
– | Celsius (°C) | 1700 |
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FEATURE OF COMPOSITION | Zr02 – 95% | ZrSi04 – 50% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
APPLICATION RANGE | High mechanical strength, exceptional wear resistance, good resistance to thermal shock. | Good refractoriness and good thermal shock, resistance, suited for L.V. circuit breaker. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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TITANIUM DIOXIDE - TITANIA ( TIO2)
Property | Units (S.I.) | Minimum Value (S.I.) | Maximum Value (S.I.) |
Atomic Volume (average) | m3/kmol | 0.0057 | 0.007 |
Density | Mg/m3 | 3.97 | 4.05 |
Bulk Modulus | GPa | 209.1 | 218.1 |
Compressive Strength | MPa | 660 | 3675 |
Hardness | MPa | 9330 | 10290 |
Modulus of Rupture | MPa | 140 | 441.2 |
Tensile Strength | MPa | 333.3 | 367.5 |
Maximum Service Temperature | K | 1840 | 1910 |
Melting Point | K | 2103 | 2123 |
Thermal Conductivity | W/m.K | 4.8 | 11.8 |
Thermal Expansion | 10-6/K | 8.4 | 11.8 |
Dielectric Constant | 10 | 85 |
Consider CSZ a top candidate when choosing a material for high strength and toughness in moist, challenging environments. With high flexural strength and very high compressive strength this material is ideally suited as a structural component in sensors, instrumentation, probes, pumps and fluid control systems.
Prime Features
CSZ offers a more robust Stabilized Zirconia material when low temperature degradation properties are in question, displaying a reduced vulnerability of molecular water attack compared to YTZP or MSZ, The ability of this material to withstand high temperature, wet operating conditions elevates its performance above other ceramic materials.
Typical Applications | |
Instrumentation | Sensors |
Seals | Bearings |
Desalination plant components | Steam system instrumentation |
Boiler probes | Underwater sensors |
Pump pistons | Medical instrumentation |
Pump liners | Valve seats |
Emission sensors | Marine system components |
Chemical pumps | Fluid metering pumps |
Fluid control valves | Chemical analysis fluid control systems |
ZTA (Zirconia Toughened Alumina)
The main advantage of Zirconia Toughened Alumina (ZTA) is the additional strength and toughness over alumina with a lower cost than zirconia (YTZP, MSZ, CSZ).
The combination of aluminum oxide and 10-20% zirconium oxide provides a much higher strength, toughness, hardness and wear resistance than alumina alone.
The 20-30% increase in strength often provides the design criteria needed at a much lower cost than using zirconia.
A process called transformation toughening is the phenomenon that increases the fracture toughness of ZTA. When placed under stress, the zirconia particles change their crystal structure from a tetragonal to a monoclinic structure, causing a volume expansion that compresses the surrounding crack in the alumina matrix.
ZTA should be considered for any application where structural strength is needed that exceeds the standard alumina properties.
Prime Features | |
Higher strength than alumina | Lower cost than zirconia |
High corrosion resistance | High erosion resistance |
High fracture toughness | Capable of a very fine surface finish |
Typical Applications | |
Standoffs | Pump piston sleeves |
Insulators | Instrument |
Probe bodies | Sensor bulbs |
Pump components | Valve seals |
Bushings | Impellers |
Fluid delivery system components | Analytical instrument columns |
Application Limitations | |
ZTA does provide a higher strength than alumina but the temperature limitation of 1500 C (2732 F) must be observed. Above this temperature the strength contribution of the zirconia is reduced. | Use in moist environments at temperatures above 250C also must be carefully considered as the zirconia is subject to low temperature degradation. |