Method for producing electrode material

Patent metadata

Field	Value
Publication number	US-9959986-B2
Application number	US-201515123012-A
Country	US
Kind code	B2
Filing date	Feb 17, 2015
Priority date	Mar 4, 2014
Publication date	May 1, 2018
Grant date	May 1, 2018

Abstract

A method for producing an electrode material, provided to involve: (i) a provisional sintering step of sintering a mixed powder containing a powder of a heat resistant element and a powder of Cr to obtain a solid solution where the heat resistant element and Cr are dissolved; (ii) a pulverizing step of pulverizing the solid solution to obtain a powder; (iii) a main sintering step of sintering a molded body obtained by molding the powder of the solid solution, to produce a sintered body; and (iv) a Cu infiltration step of infiltrating the sintered body with Cu.

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 kind of a heat resistant element selected from the group consisting of 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;
a pulverizing step of pulverizing the solid solution to obtain a powder of the solid solution;
a main sintering step of sintering a molded body obtained by molding the powder of the solid solution, to produce a sintered body; and
a Cu infiltration step of infiltrating the sintered body with Cu,
wherein in the provisional sintering step the mixed powder is sintered until either a peak corresponding to Cr element or a peak corresponding to the heat resistant element completely disappears, the peak corresponding to Cr element and the peak corresponding to the heat resistant element being observed by X ray diffraction measurement made on the solid solution.

2. A method for producing an electrode material, as claimed in claim 1 , wherein a sintering temperature applied in the provisional sintering step is within a range of not lower than 1250° C. and not higher than the melting point of Cr.

3. A method for producing an electrode material, as claimed in claim 1 , wherein a sintering temperature applied in the main sintering step is within a range of not lower than the melting point of Cu and not higher than the melting point of Cr.

4. A method for producing an electrode material, as claimed in claim 1 , wherein in the provisional sintering step the mixed powder is sintered in a vacuum furnace, and a degree of vacuum in the vacuum furnace after sintering the mixed powder is not larger than 5.0×10 −3 Pa.

5. A method for producing an electrode material, as claimed in claim 1 , wherein in the provisional sintering step the mixed powder is subjected to a press molding.

6. A method for producing an electrode material, as claimed in claim 5 , wherein the mixed powder is molded at a pressure of not higher than 0.1 t/cm 2 .

Assignees

• Meidensha Electric Mfg Co Ltd

Inventors

• Kitakizaki Kaoru
• Ishikawa Keita
• Hayashi Shota
• Suzuki Nobutaka
• Hasegawa Kosuke

Classifications

• C22C27/06

  Alloys based on chromium · CPC title

• H01H33/664

  Contacts; Arc-extinguishing means, e.g. arcing rings · CPC title

• H01H33/662

  Housings or protective screens · CPC title

• B22F2998/10

  Processes characterised by the sequence of their steps · CPC title

• B22F3/1007

  Atmosphere (B22F3/1021 takes precedence) · CPC title