Thermal Ceramics MRI 90V Pre-Fired Refractory Shapes

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Thermal Ceramics MRI 90V Pre-Fired Refractory Shapes
Categories:	Ceramic; Oxide; Aluminum Oxide
Material Notes:	MRI pressed fired shapes are used in a variety of alloy melt-pour systems. The pressed manufacture process meets the tight tolerance specifications required by end users. Precise size dies and detailed product inspection provide the user with a high-quality, dimensionally accurate refractory shape. MRI 90V 90% alumina, versatile mix commonly used for crucibles and furnace spouts. Features: Variety of available compositions in high alumina and fused silica. Extreme tight tolerance capabilities Low gas permeability to ferrous alloys Good non-wetting characteristics Excellent mechanical strength Proven performance in super alloy, investment Applications: Standard size crucibles and liners for induction melting and investment casting Tundish nozzles - meet user demands on pour stream and pour speeds Gas atomized nozzles - for custom-designed atomizing powder metal systems Information provided by Thermal Ceramics Data has not been recently verified. Please contact manufacturer for current information.
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Physical Properties	Metric	English	Comments

Bulk Density	2.82 g/cc	0.102 lb/in³
Porosity	20 %	20 %	Apparent

Mechanical Properties	Metric	English	Comments
Modulus of Rupture	0.0172 GPa	2.50 ksi

Thermal Properties	Metric	English	Comments
CTE, linear	7.38 µm/m-°C @Temperature 20.0 °C	4.10 µin/in-°F @Temperature 68.0 °F
Thermal Conductivity	2.31 W/m-K @Temperature 1090 °C	16.0 BTU-in/hr-ft²-°F @Temperature 2000 °F	ASTM C417
Maximum Service Temperature, Air	1700 °C	3090 °F

Component Elements Properties	Metric	English	Comments
Al2O3	91 %	91 %
Alkalis	0.15 %	0.15 %
CaO+MgO	0.040 %	0.040 %
Fe2O3	0.15 %	0.15 %
SiO2	8.0 %	8.0 %
TiO2	0.10 %	0.10 %

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CTHERM142 / 2462

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