Method for manufacturing electrode material and electrode material

Patent metadata

Field	Value
Publication number	US-10058923-B2
Application number	US-201515508256-A
Country	US
Kind code	B2
Filing date	Aug 27, 2015
Priority date	Sep 11, 2014
Publication date	Aug 28, 2018
Grant date	Aug 28, 2018

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

The invention claimed is:

1. A method for producing an electrode material, comprising:
a provisional sintering step of sintering a mixed powder containing a powder of at least one heat resistant element selected from elements including Mo, W, Ta, Nb, V, and Zr and a powder of Cr to obtain a solid solution where the at least one heat resistant element and Cr are dissolved, the powder of the at least one 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 at least one heat resistant element and the powder of Cr being mixed such that a weight ratio of Cr to the at least one 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.

2. The method for producing the electrode material as claimed in claim 1 , 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.

3. The method for producing the electrode material as claimed in claim 1 , wherein the content of the powder of the at least one heat resistant element relative to the electrode material is 32-68 wt %.

4. The method for producing the electrode material as claimed in claim 1 , wherein the content of the powder of Cr relative to the electrode material is 4-15 wt %.

5. The method for producing the electrode material as claimed in claim 1 ,
wherein an average particle diameter of the powder of the at least one heat resistant element is 2-20 μm, and
wherein an average particle diameter of the powder of Cr is less than 300 μm.

6. The method for producing the electrode material as claimed in claim 1 ,
wherein an average particle diameter of the powder of the at least one heat resistant element is 2-20 μm, and
wherein an average particle diameter of the powder of Cr is less than 150 μm.

7. The method for producing the electrode material as claimed in claim 1 ,
wherein an average particle diameter of the powder of the at least one heat resistant element is 2-10 μm, and
wherein an average particle diameter of the powder of Cr is less than 45 μm.

8. The method for producing the electrode material as claimed in claim 1 , wherein the content of the Cu and/or Ag relative to the electrode material is 25-60 wt %.

Assignees

• Meidensha Electric Mfg Co Ltd

Inventors

• Ishikawa Keita
• Kitakizaki Kaoru
• Hayashi Shota

Classifications

• C22C27/06

  Alloys based on chromium · CPC title

• C22C27/04

  Alloys based on tungsten or molybdenum · CPC title

• B22F3/15

  Hot isostatic pressing · CPC title

• C22C1/08

  Alloys with open or closed pores · CPC title

• 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