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US 2019/0055660 A1Published application
Composition For Making Wettable Cathode In Aluminum Smelting
AssigneeAlcoa USA Corp.
InventorsDouglas A. Weirauch, Lance M. Sworts, Brian J. Tielsch, Robert A. DiMilia
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Abstract
Compositions for making wettable cathodes to be used in aluminum electrolysis cells are disclosed. The compositions generally include titanium diboride (TiB2) and metal additives. The amount of selected metal additives may result in production of electrodes having a tailored density and/or porosity. The electrodes may be durable and used in aluminum electrolysis cells.
Claims14
A component, comprising:
- 0.01 to not greater than 0.45 wt. % metal additives, the balance being TiB2 and unavoidable impurities, wherein the unavoidable impurities make up less than 2 wt. % of the component;
- wherein the component has a density of at least 90% to not greater than 98% of its theoretical density, and wherein the component has an apparent porosity of 0.05% to 4%.
An electrode for use in an aluminum electrolysis cell, the electrode comprising:
- 0.01 to less than 0.5 wt. % metal additives, the balance being TiB2 and unavoidable impurities, wherein the unavoidable impurities make up less than 2 wt. % of the electrode;
- wherein the electrode has a density of at least 90% to not greater than 98% of its theoretical density, and wherein the component has an apparent porosity of 0.05% to 4%.
A method comprising:
- producing a TiB2 component from a TiB2 composition, the TiB2 composition comprising:
- 0.01 to not greater than 0.45 wt. % metal additives, the balance being TiB2 and unavoidable impurities, wherein the unavoidable impurities make up less than 2 wt. % of the electrode,
- wherein the TiB2 component has a density of at least 90% to not greater than 98% of its theoretical density, and wherein the component has an apparent porosity of 0.05% to 4%.
An electrode, comprising:
- 0.025 to 0.1 wt. % metal additives, wherein the metal additives are selected from the group consisting of:
- Cr;
- Mn;
- Mo;
- Pt;
- Po;
- Fe;
- Ni;
- Co;
- W;
- and combinations thereof
- the balance being TiB2 and unavoidable impurities,
- wherein the unavoidable impurities make up less than 2 wt. % of the component;
- wherein the component has a density of 88.9% to 98.5% of its theoretical density, and
- wherein the component has an apparent porosity of 0.05% to 4%.
12 more elements
Dependencies are inferred from the claim text.