Crucible and method for its use
AssigneeApplied Vacuum Technologies 1 AB
InventorJohan Nordlander
Life of this patent
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Abstract
A crucible particularly intended for use when vaporizing aluminum and comprised of an ultralow cement compound. Subsequent to moulding and drying the crucible, the crucible is baked at a high temperature, which corresponds to the temperature of the crucible when used in a vaporizing process, 1,200.degree. C. for instance. The crucible comprises an outer wall and a bottom in which upstanding projections or corrugations are provided. These upstanding projections or corrugations fulfill the function of enabling gas enclosures generated when mixing the cement compound to rise up and collect in the corrugation peaks without impairing the homogeneity of the material in the actual crucible bottom.
Claims12
A crucible for a metal melt for use as an evaporation source in vacuum metalization of a substrate, comprising:
- a cup-shaped ultra low cement mass of aluminum oxide and a binder selected from the group consisting of calcium oxide, iron oxide and mixtures thereof;
- said binder constituting 0.2 to 1.0 percent of said mass.
A method for providing a metal melt for use as an evaporation source for vacuum metalization of a substrate, comprising:
- (a) providing as a crucible for said melt a cup-shaped ultra low cement mass of aluminum oxide and a binder selected from the group consisting of calcium oxide, iron oxide and mixtures thereof;
- said binder constituting 0.2 to 1.0 percent of said mass;
- (b) placing a body of aluminum in said crucible;
- and
- (c) heating in a vacuum said crucible containing said body of aluminum, thereby producing said melt.
Dependencies are inferred from the claim text.