US4624766A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aluminum wettable cathode material for use in aluminum reduction cell
Assignee: Rio Tinto Aluminium Ltd
•
Filing: 1985-07-03
•
Granted: 1986-11-25
•
Expires: 2005-07-03
Abstract
Abstract Aluminum cells may be produced having cathode surfaces which are wetted by aluminum, said surfaces comprising Refractory Hard Materials in a non-graphitized carbon matrix. Such cells may utilize inclined or drained cathodes as well as non-consumable anodes.
Inventors
- 👤 Larry G. Boxall
- 👤 William M. Buchta
- 👤 Arthur V. Cooke
- 👤 Dennis C. Nagle
- 👤 Douglas W. Townsend
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:29
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/80; C04B41/81; C04B41/85; C04B41/87; C04B35/00; C04B35/515; C04B35/56; C04B35/5607; C04B35/5611; C04B35/5622; C04B35/58; C04B35/5805; C04B35/58064; C04B35/58071; C04B35/58078; C04B35/622; C04B35/626; C04B35/63; C04B35/6303; C04B35/632; C04B35/634; C04B35/63448; C04B35/63452; C04B35/6346; C04B35/63472; C04B35/63476; C04B41/45; C04B41/50; C04B41/5053; C04B41/5062; C04B41/507; C25; C25C; C25C3/00; C25C3/06; C25C3/08
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
98 words
An aluminum wettable, cured, carbonized cathode material for use in a cell for the electrolytic reduction of alumina to aluminum comprising a Refractory Hard Material in a carbonaceous matrix comprising carbonaceous filler having a particle size less than 100 mesh and carbonaceous additive selected from the group consisting of carbon having a particle size greater than 100 mesh and carbon fiber and mixtures thereof bonded by a non-graphitized amorphous carbon, said matrix having a rate of ablation essentially equal to the rate of wear and dissolution of said Refractory Hard Material in the operating environment of said cell.
Claim 2
Dependent Claim
98 words
An aluminum wettable, cured, carbonized cathode material for use in a cell for the electrolytic reduction of alumina to aluminum comprising a Refractory Hard Material in a carbonaceous matrix comprising carbonaceous filler having a particle size less than 100 mesh and carbonaceous additive selected from the group consisting of carbon having a particle size greater than 100 mesh and carbon fiber and mixtures thereof bonded by a non-graphitized amorphous carbon, said matrix having a rate of ablation essentially equal to the rate of wear and dissolution of said Refractory Hard Material in the operating environment of said cell.
Claim 3
Dependent Claim
15 words
The material of claim 1 wherein said non-graphitized amorphous carbon is derived from thermosetting resin.
Claim 4
Dependent Claim
28 words
The material of claim 2 wherein said Refractory Hard Material is selected from the group consisting of titanium diboride, titanium carbide, zirconium diboride, zirconium carbide and alloys thereof.
Claim 5
Dependent Claim
14 words
The material of the claim 3 wherein said Refractory Hard Material is titanium diboride.
Claim 6
Dependent Claim
26 words
The material of claim 4 wherein said carbon of said carbonaceous additive has a particle size of greater than 100 mesh and less than 4 mesh.
Claim 7
Dependent Claim
49 words
The material of claim 4 wherein said TiB 2 is in the form selected from the group consisting of single crystals of TiB 2 , bicrystals of TiB 2 , open clusters of crystal of TiB 2 , and crushed and ground crystals of TiB 2 and mixtures thereof.
Claim 8
Dependent Claim
13 words
The material of claim 6 wherein said TiB 2 is in particle form.
Claim 9
Dependent Claim
19 words
The material of claim 7 wherein said particles have a size ranging from submicron up to about 10 mesh.
Claim 10
Dependent Claim
14 words
The material of claim 8 wherein said particles range up to about 100 mesh.
Claim 11
Dependent Claim
14 words
The material of claim 9 wherein said particles range up to about 325 mesh.
Claim 12
Dependent Claim
30 words
The material of claim 2, 7, or 10 wherein said Refractory Hard Material comprises from about 20 percent to about 70 percent of said material prior to curing and carbonizing.
Claim 13
Dependent Claim
25 words
The material of claim 11 wherein said thermosetting resin comprises from about 1 to about 40 percent of said material prior to curing and carbonizing.
Claim 14
Dependent Claim
26 words
The material of claim 12 wherein said carbonaceous matrix comprises from about 30 percent to about 80 percent of said material prior to curing and carbonizing.
Claim 15
Dependent Claim
23 words
The material of claim 13 wherein said thermosetting resin is selected from the group consisting of phenolic resins, furane resins and mixtures thereof.
Claim 16
Dependent Claim
30 words
The material of claim 2, 7, or 10 wherein said Refractory Hard Material comprises from about 35 percent to about 60 percent of said material prior to curing and carbonizing.
Claim 17
Dependent Claim
25 words
The material of claim 15 wherein said thermosetting resinl comprises from about 1 to about 40 percent of said material prior to curing and carbonizing.
Claim 18
Dependent Claim
26 words
The material of claim 16 wherein said carbonaceous matrix comprises from about 40 percent to about 65 percent of said material prior to curing and carbonizing.
Claim 19
Dependent Claim
23 words
The material of claim 14 wherein said thermosetting resin is selected from the group consisting of phenolic resins, furane resins and mixtures thereof.
Claim 20
Dependent Claim
25 words
The material of claim 18 wherein said carbonaceous filler comprises about 10 percent to about 40 percent of said material prior to curing and carbonizing.
Claim 21
Dependent Claim
25 words
The material of claim 19 wherein said carbonaceous additive comprises about 5 percent to about 15 percent of said material prior to curing and carbonizing.
Claim 22
Dependent Claim
14 words
The material of claim 3 wherein said Refractory Hard Material is in particle form.
Claim 23
Dependent Claim
19 words
The material of claim 21 wherein said particles have a size ranging from submicron up to about 10 mesh.
Claim 24
Dependent Claim
25 words
The material of claim 2 wherein said thermosetting resin comprises from about 1 to about 40 percent of said material prior to curing and carbonizing.
Claim 25
Dependent Claim
23 words
The material of claim 2 wherein said thermosetting resin is selected from the group consisting of phenolic resins, furane resins and mixtures thereof.
Claim 26
Dependent Claim
35 words
The material of claim 2 wherein said thermosetting resin is selected from the group consisting of phenolic resins, furane resins, polyphenylene resins, heterocyclic resins, epoxy resins, silicone resins, alkyd resins, polyimide resins and mixtures thereof.
Claim 27
Dependent Claim
27 words
The material of claim 25 wherein said Refractory Hard Material comprises from about 10 percent to about 90 percent of said material prior to curing and carbonizing.
Claim 28
Dependent Claim
26 words
The material of claim 1 wherein said carbon of said carbonaceous additive has a particle size of greater than 100 mesh and less than 4 mesh.
References Cited (Backward Citations)
US3400061A
Cited
US3441529A
Cited
US3661736A
Cited
US4360417A
Cited
US4308114A
Cited
US4439382A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-11-24 | 1990-05-26 | 1990-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-24 | 1994-05-26 | 1994-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-24 | 1998-05-26 | 1998-11-25 | $7700.00 | Window Closed / Lapsed |