|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.|
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.
|Color||–||–||Gray – Tan|
|Water Absorption||C 20-97||%||0|
|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)|
|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)
|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.|
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|
|Modulus of Rupture||MPa||140||441.2|
|Maximum Service Temperature||K||1840||1910|
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.
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.
|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.
|Higher strength than alumina||Lower cost than zirconia|
|High corrosion resistance||High erosion resistance|
|High fracture toughness||Capable of a very fine surface finish|
|Standoffs||Pump piston sleeves|
|Probe bodies||Sensor bulbs|
|Pump components||Valve seals|
|Fluid delivery system components||Analytical instrument columns|
|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.|