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. |