Alumina Grades and their Applications

McDanel Advanced Ceramic Technologies LLC is a leading manufacturer of high quality refractory tubes and sheaths, supplying major heat-using industries worldwide for over 80 years.

They offer high purity alumina, mullite, partially stabilized zirconia and sialon tubing. The impervious fine grained ceramic products are used in many applications where it is necessary to provide a protective atmosphere at high temperatures without contamination. Material selection depends upon operating working conditions such as peak temperature, chemical environment and abruptness of temperature change.

Various rods, tubes, crucibles, dishes, boats, trays and discs are standard items and a significant capability for producing custom shapes is available.

Aluminas

Aluminas (Al2O3) are generally more chemically resistant, harder, stronger and more refractory than mullite.

Grades and Applications

Table 1. Grades and typical uses of alumina

Grades

Typical Uses

998 99.8% alumina can be used at operating temperatures to 1950°C in both oxidizing and reducing atmospheres. Tubes have been evacuated to 10-7 Torr at 1500°C. 998 proves inert to hydrogen, carbon and refractory metals in many severe situations.

Noble metal thermocouple protection, furnace tubes, high temperature vacuum furnaces, heat treating furnace rollers, radiant tubes, laser tubes, corona treater tubes and ozone generators.

AP35 99.0% alumina is a high purity body designed for the extrusion manufacturing process. It offers good insulating characteristics and high temperature capabilities.

Corrosive environments and electrical insulation applications. Noble metal thermocouples and diffusion furnace profile couples, laser wave guides and RTD's.

AV30 96% alumina is an exceptionally tough alumina at an economical price designed especially for wear resistant applications.

Abrasive and corrosive environments.

Tolerances

Table 2. Dimensional tolerances of alumina components

MATERIAL

TO MAXIMUM OUTSIDE DIAMETER OF:

25.4mm (1")

114.3mm (4 1/2")

152.4mm (6")

228.6mm (9")

ALUMINA

±5% or ±.65mm
±(0.025") min.

±4% or ±1.27 mm
(±.050") min.

±5%

±6%

Standard camber tolerance is .794 mm (1/32")) per 305 mm (1 foot).
Standard strength tolerance is ±1.575 mm (1/16").
Tighter tolerances and non-catalog tolerances are provided by quotation.

Source: McDanel Advanced Ceramic Technologies

For more information on this source please visit McDanel Advanced Ceramic Technologies.

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