Browse Prior Art Database

Crucible for Aluminum Evaporation

IP.com Disclosure Number: IPCOM000089809D
Original Publication Date: 1977-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 21K

Publishing Venue

IBM

Related People

Morgan, WM: AUTHOR

Abstract

Boron nitride crucibles are preferred to crucibles of other materials for the evaporation of aluminum. However, molten aluminum wets the wall of most crucibles including boron nitride and tends to climb out, dissolving the heater.

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Crucible for Aluminum Evaporation

Boron nitride crucibles are preferred to crucibles of other materials for the evaporation of aluminum. However, molten aluminum wets the wall of most crucibles including boron nitride and tends to climb out, dissolving the heater.

The problem is overcome by providing a carbon barrier, since aluminum does not wet carbon. A flanged crucible 1 has its upper rim 2 coated with colloidal graphite. Alternatively, an unflanged crucible 3 is provided with a press fit carbon washer 4 which is sealed to the crucible with colloidal graphite.

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