# US 2017/0282249 A1 · Method for manufacturing electrode material and electrode material

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- Number: US 2017/0282249 A1
- Document ID: US20170282249A1
- Status: Published application
- Kind: A1
- Application number: 15/508,256
- Filed: 2015-08-27
- Published: 2017-10-05
- Earliest claimed: 2014-09-11
- Assignees: Meidensha Corporation
- Applicants: Meidensha Corporation
- Inventors: Keita ISHIKAWA; Kaoru KITAKIZAKI; Shota HAYASHI
- Web page: https://patentgrep.com/patent/US20170282249A1

## CPC

- B22F 3/26: Impregnating {(making ferrous alloys by impregnation C22C33/0242)}
- B22F 3/15: Hot isostatic pressing
- B22F 7/008: {characterised by the composition}
- B22F 7/06: of composite workpieces or articles from parts, e.g. to form tipped tools {(B22F7/002 takes precedence)}
- B22F 9/04: starting from solid material, e.g. by crushing, grinding or milling ({C22C1/1084 takes precedence}; crushing, grinding or milling, in general, see the relevant subclasses, e.g. B02C)
- C22C 1/08: Alloys with open or closed pores
- C22C 9/00: Alloys based on copper
- C22C 27/04: Alloys based on tungsten or molybdenum
- H01H 1/0206: {containing as major components Cu and Cr}
- B22F 2998/10: Processes characterised by the sequence of their steps
- C22C 27/06: Alloys based on chromium
- B22F: WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER (making alloys by powder metallurgy C22C); APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- H01H: ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES (contact cables H01B7/10; electrolytic self-interrupters H01G9/18; emergency protective circuit arrangements H02H; switching by electronic means without contact-making H03K17/00)

## Abstract

What is disclosed is an electrode material including a sintered body containing a heat resistant element and Cr and being infiltrated with a highly conductive material. A powder mixture of a heat resistant element powder and a Cr powder is subjected to a provisional sintering in advance, thereby causing solid phase diffusion of the heat resistant element and Cr. After a Mo—Cr solid solution obtained by the provisional sintering is pulverized, the pulverized Mo—Cr solid solution powder is molded and sintered. A sintered body obtained by sintering is subjected to a HIP treatment. The highly conductive metal is disposed on the sintered body after the HIP treatment, and infiltrated into the sintered body by heating at a predetermined temperature. By conducting the HIP treatment, the withstand voltage capability and current-interrupting capability of the electrode material are improved.

## Claims

### Claim at position 1

-5. (canceled)

### Claim 6

A method for producing an electrode material, comprising:
a provisional sintering step of sintering a mixed powder containing a powder of a heat resistant element having at least one kind selected from elements including Mo, W, Ta, Nb, V, and Zr and a powder of Cr to obtain a solid solution where the heat resistant element and Cr are dissolved, the powder of the heat resistant element having a content of 6 to 76 wt % relative to the electrode material and the powder of Cr having a content of 1.5 to 64 wt % relative to the electrode material, the powder of the heat resistant element and the powder of Cr being mixed such that a weight ratio of Cr to the heat resistant element is four or less to one;
a pulverizing step of pulverizing the solid solution to obtain a powder of the solid solution;
a hot isostatic pressing treatment step of subjecting a molded body formed by molding the powder of the solid solution or a sintered body of the molded body to a hot isostatic pressing treatment; and
an infiltration step of infiltrating Cu and/or Ag into an objective body obtained by the hot isostatic pressing treatment after the hot isostatic pressing treatment, Cu and/or Ag having a content of 20 to 70 wt % relative to the electrode material.

### Claim 7 (depends on 6)

The method for producing the electrode material as claimed in claim 6, wherein a filling rate of a molded body or a sintered body of the molded body after the hot isostatic pressing treatment is improved by 10% or more in the hot isostatic pressing treatment step, as compared with a filling rate of a molded body or a sintered body of the molded body before the hot isostatic pressing treatment.