Reynolds Metals Company

Thomas J Johnston

Nolan E Richards

Alton T Tabereaux

Curtis J McMinn

John T Willett

Howard I Kaplan

Jerry H Bryce

Dennis G Brooks

James S Berry, Jr

Jan M Pottinger

An apparatus and method for measuring coolant quenching rates includes a metallic disk supported on a ceramic tube, the metallic disk including a plurality of thermocouples therein. The metallic disk is heated from above by a torch and coolant is sprayed on the underside of the disk. Changes in temperature throughout the metallic disk are detected by the thermocouples to measure various quenching parameters. The metallic disk may be surrounded by insulating material to maintain heat flow through the disk in a predetermined manner. By heating, insulating and cooling the metallic disk, temperature measurements can be quantified into heat transfer rates to investigate various heat transfer mechanisms and different types of coolants.

Method of and apparatus for measuring coolant quenching rates

A composite pellet for use as feed for a carbothermic alumina reduction furnace is disclosed. A carbonaceous core is surrounded by substantially carbon-free alumina shell. The resulting pellet has increased thermal and electrical stability in the reduction furnace.

Composite pellet for use as a carbothermic reduction feed

An improved probe for an alumina concentration meter is disclosed. The active anode and cathode surfaces of the probe lie on a common surface. A bath temperature measuring device is included within the probe.

Probe for alumina concentration meter

This invention concerns cathodes for alumina reduction cells, particularly drained cathodes, which present a refractory surface for contacting molten aluminum on the cell floor. This invention also concerns materials for constructing such cathodes. The cathodes described comprise a carbonaceous bed, preferably a graphite bed, and a composite tile. This tile is characterized by a layer of a refractory hard metal (RHM) material bonded to a base layer of a graphitic material, where the RHM layer comprises a hot pressed mixture of titanium diboride and aluminum nitride powders. The tile is further characterized by the bond between the RHM layer and the graphitic base layer, such bond having been produced simultaneously as the RHM layer is formed by hot pressing the mixture of titanium diboride and aluminum nitride powders directly against the graphitic base layer. The graphitic base layer is in turn bonded to the carbonaceous bed by means of a carbonaceous cement, and the RHM layer thereby provides a refractory surface for contacting molten aluminum.

Cathodes for alumina reduction cells

Refractory surfaces for alumina reduction cell cathodes and methods for

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Rogersville, AL, United States of America

Thomas J Johnston