Method for manufacturing electrode material and electrode material

Patent metadata

Field	Value
Publication number	US-2017282249-A1
Application number	US-201515508256-A
Country	US
Kind code	A1
Filing date	Aug 27, 2015
Priority date	Sep 11, 2014
Publication date	Oct 5, 2017
Grant date	—

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.

First claim

1 .- 5 . (canceled)

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.

7 . 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.

Assignees

• Meidensha Electric Mfg Co Ltd

Inventors

• Ishikawa Keita
• Kitakizaki Kaoru
• Hayashi Shota

Classifications

• B22F9/04

  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) · CPC title

• B22F3/26 Primary

  Impregnating {(making ferrous alloys by impregnation C22C33/0242)} · CPC title

• C22C1/08

  Alloys with open or closed pores · CPC title

• B22F3/15

  Hot isostatic pressing · CPC title

• C22C27/04

  Alloys based on tungsten or molybdenum · CPC title