METHOD OF MAKING A PLASTICALLY SHAPEABLE CATHODE MATERIAL

• US 3,615,901 A
• Filed: 12/01/1969
• Issued: 10/26/1971
• Est. Priority Date: 12/01/1969
• Status: Expired due to Term

• Current Assignee: Gustav K. Medicus
• Original Assignee: Gustav K. Medicus
• Inventors: Medicus, Gustav K.
• Primary Examiner(s): Rutledge, L. Dewayne
• Assistant Examiner(s): Stallard, W. W.
• Application Number:
  US04/881,265
• Time in Patent Office: 694 Days
• Field of Search: 148/11.5R,126,31.5 29/25.11,182.5,420.5 117/223 75/206,208
• US Class Current: 419/8
• CPC Class Codes: B22F 7/04 with one or more layers not made from powder, e.g. made from solid metal
• CPC Class Codes: H01J 9/042 Manufacture, activation of the emissive part

Abstract

A plastically shapeable cathode material is prepared by depositing on a nickel substrate a layer of a mixture of nickel or nickel oxide powder and barium, strontium and calcium carbonates; sintering in a neutral or reducing atmosphere the nickel substrate with deposited layer; compressing the sintered material; cold rolling the sintered and compressed material; annealing the resulting cold-rolled material; and repeating the latter two steps until the nickel substrate with deposited layer has a desired thickness.

Claims

2. A process according to claim 1 in which said surface is a sheet of nickel;

said sheet with said layer deposited thereon is sintered in a reducing or neutral atmosphere;

said sintered sheet with adhering layer is compressed;

said sintered and compressed nickel sheet with said layer bonded thereto is cold rolled; and

said cold-rolled nickel sheet and bonded layer are annealed in a reducing or neutral atmosphere.

3. A process according to claim 2 in which said mixture consists essentially of nickel powder or nickel oxide powder, barium carbonate, strontium carbonate and calcium carbonate, said carbonates constituting 20 to 65 weight percent of said mixture with the remainder being nickel or nickel oxide;

said nickel sheet has a thickness in the range of 0.25 to 5 mm.; and

the ratio of the thickness of said layer to the thickness of said sheet is in the range of 10;

1 to 1;

10.

4. A process according to claim 2 in which said mixture consists essentially of nickel powder or nickel oxide powder, barium carbonate, strontium carbonate and barium carbonate, said nickel or nickel oxide constituting from 70 to 80 weight percent of said mixture, the remainder being carbonates.

5. A process according to claim 2 in which said layer is formed by sieving nickel powder or nickel oxide powder onto said sheet and then sieving onto said nickel powder or nickel oxide powder a mixture of nickel powder or nickel oxide powder and said carbonates.

6. A process according to claim 3 in which said sintering and said annealing are conducted in a hydrogen atmosphere.

7. A process according to claim 6 in which said sheet with deposited layer is sintered at a temperature in the range of 900* to 1300* C. for a time to reduce substantially all of said carbonates;

a pressure between about 5,000 and 20,000 p.s.i.a. is applied to said sintered sheet with adhering layer;

said sintered and compressed sheet with bonded layer is cold rolled in one direction until said sheet can no longer be worked; and

said cold-rolled nickel sheet with bonded layer is annealed at a temperature in the range of 500* to 800* C.