 Aromatic etherketone/sulphone copolymers |
| We claim: 1. An amorphous aromatic etherketone/sulphone copolymer containing 15 to 70 mole % of ... |
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| Electrical switch and actuating mechanism therefor |
| According to the present invention, an electrical switch comprises an electrical contact assembly ... |
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| Electrical connector receptacle having molded conductors |
| I claim: 1. An electrical connector receptacle of the type comprising an insulating housing having ... |
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| Process of making a jack-type electrical connector |
| OF THE DRAWINGS FIG. 1 is a perspective view of a jack-type electrical connector. FIG. 2 is a ... |
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| Methods of and apparatus for assembling contact elements to connector housing |
| The foregoing problems of the prior art are overcome by the methods and apparatus of this invention.... |
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| Ergonomic utility knife |
| OF THE INVENTION Referring first to FIG. 1, the utility knife 10 of the present invention may be ... |
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| Electrical harness fabrication apparatus |
| It is, therefore, the principal object of the present invention to provide an improved method and ... |
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| Cable supporting apparatus |
| According to a first aspect of the invention, there is provided apparatus for supporting cable and ... |
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| Method and apparatus for connecting electrical wires |
| OF THE INVENTION The device of the present invention comprises moving head 25, aligning means 26, ... |
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Method of making a transition metal electrode
| Details |
Inventors: Bones, Roger J.; Teagle, David A.; Brooker, Stephen D.;
Assignee: Lilliwyte Societe Anonyme (LU)
Primary Examiner: Niebling; John F.
Assistant Examiner: Gorges; Kathryn
Attorney, Agent or Firm: Arnold, White & Durkee
A method of making a cathode suitable for an electrochemical cell of the type having a molten sodium anode, a beta"-alumina separator, and a cathode which comprises one or more transition metals selected from the group comprising Fe, Ni, Co, Cr and Mn. The method comprises heating a particulate starting material comprising at least one member of the group of transition metals in an oxidizing atmosphere to cause its particles to become at least partially oxidized, and to adhere together to form a unitary porous matrix. This matrix is then heated in a reducing atmosphere at least partially to reduce the oxide formed during the formation of the matrix, and the reduced matrix is then impregnated with a sodium aluminium chloride molten salt electrolyte. Sodium chloride in dispersed form is incorporated into the matrix, preferably by mixing sodium chloride in particulate form with the particulate transition metal starting material, before the heating in an oxidizing atmosphere to form the matrix. |
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DETAILED DESCRIPTION We claim: 1.
A method of making a cathode suitable for an electrochemical cell of the type comprising a sodium anode which is molten at the operating temperature of the cell, a sodium aluminium halide molten salt electrolyte which is also molten at the operating temperature of the cell, a cathode which is in the form of an electronically conductive electrolyte-permeable matrix impregnated with said molten salt electrolyte, and between the anode and the electrolyte and separating said anode from said electrolyte, a separator selected from the group comprising solid conductors of sodium ions and micromolecular sieves which contain sodium sorbed therein, the molten salt electrolyte in the fully charged state of the cell comprising an equimolar mixture of sodium halide and aluminium halide, the method comprising: heating a particulate starting material comprising at least one member selected from the group of transition metals comprising Fe, Ni, Co, Cr and Mn in an oxidising atmosphere to cause its particles to become at least partially oxidized and to adhere together to form a unitary porous matrix; heating the oxidized matrix in a reducing atmosphere at least partially to reduce the oxide formed during the formation of the matrix; and impregnating the reduced matrix with a sodium aluminium halide molten salt electrolyte, sodium chloride in dispersed form being incorporated into the matrix.
2.
A method as claimed in claim 1, in which formation of the matrix and incorporation of the sodium chloride into the matrix take place simultaneously, the method including the step of dispersing particulate sodium chloride in the particulate starting material which is heated to form the matrix, before the matrix is formed by said heating in an oxidizing atmosphere.
3.
A method as claimed in claim 2, in which the particulate starting material has particles which fall within the particle size range 10-100 microns, the particles of the sodium chloride being present in two particle size fractions, namely a size fraction forming 20-40% by mass of the sodium chloride which comprises particles in the particle size range 5-10 microns, and a fraction forming 60-80% by mass of the sodium chloride which comprises particles in the particle size range 50-250 microns
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Fuel Cells 
