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Aluminum Oxide Ceramics for Crucible

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Features

TATEHO OZARK specializes in magnesia ceramics, but many of our customers also use alumina ceramics for various applications. TATEHO OZARK manufactures 99.5% alumina crucibles and trays in the same sizes and price range as our magnesia products.

Chemical Composition(Typical)

CONTENT	Typical
Al₂O₃	99.60%
CaO	0.04%
SiO₂	0.02%
MgO	0.06%
Fe₂O₃	0.04%
Na₂O	0.08%

The properties are the typical values and not the guaranteed value.

Physical Properties(Typical)

CONTENT	Typical
Density	> 3.7 gm/cc minimum, typically 3.85 gm/cc
Porosity	Typically 4%, less than 1% open porosity

The properties are the typical values and not the guaranteed value.

Fired alumina parts have reasonably good mechanical strength and reasonably good thermal shock resistance. However, the thin walls limit the mechanical strength and charge weight the crucibles can tolerate. Please consult us with any questions concerning physical properties.

Size and Surface

CONTENT	Typical
Dimensions	The normal fabrication range is for diameters less than 5 inches and lengths less than 8 inches. Larger parts can be made upon request, at some sacrifice in cost and dimensional control. Please inquire for further information.
Wall thickness	The nominal wall thickness for most shapes is 0.125” (or 3mm), and the maximum thickness available is about 0.2 inch (4mm) and the minimum is about 0.08 inch (2mm).
Surface	Surface finish may vary, but is usually smooth. Surface is not usually “vitrified”.
Tolerances	Unless tighter tolerances are specified, dimensional tolerances for diameters, heights, and lateral dimensions are 0.125 inch or 5%, whichever is less. These tolerances apply to nominal dimensions only, and do not apply to out of round conditions or distortions. Please consult us if dimensional constraints are important so that the tolerances and inspection methods may be clarified. Other visual inspection criteria will be supplied on request.

The properties are the typical values and not the guaranteed value.

Shape

Parts are made by slip casting. Slip casting is suitable for production of hollow shapes with uniform wall thickness and an opening to the interior. This is ideal for shapes such as crucibles, trays, boats, etc. There should be no re-entrant angles along the longitudinal cross section of the part (such as Ell-shapes, Crosses, etc.).
Slip casting will produce a variety of shapes as indicated above. Surface finish does not approximate that of machined surfaces. Nominally flat surfaces, such as lids, crucible and tray bottoms, and plates will be concave or convex after firing. If precision dimensions or flat surfaces are required, additional wet diamond machining is required, and many limitations apply. Custom shapes will require set-up charges and sufficient lead time for mold master and mold production.

CONTACT

For inquiries about Ozark or products, please contact.

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