Metallic wire rod comprising iridium-containing alloy

Patent metadata

Field	Value
Publication number	US-10047415-B2
Application number	US-201113882572-A
Country	US
Kind code	B2
Filing date	Dec 15, 2011
Priority date	Dec 27, 2010
Publication date	Aug 14, 2018
Grant date	Aug 14, 2018

Abstract

The present invention is a metallic wire rod comprising iridium or an iridium-containing alloy and, the wire rod has in the cross section thereof biaxial crystal orientation of 50% or more of abundance proportion of textures in which crystallographic orientation has preferred orientation to <100> direction. In the present invention, crystal orientation in the outer periphery from semicircle of the cross section which is the periphery of the wire rod is important, and in this zone, abundance proportion of textures in which crystallographic orientation has preferred orientation to <100> direction is preferably not less than 50%.

First claim

What is claimed is:

1. A metallic wire rod comprising iridium or an iridium-containing alloy, wherein the wire rod has a diameter of less than 12 mm, which wire rod comprises a central area and an outer periphery, wherein the outer periphery has a biaxial crystal orientation and wherein the outer periphery has an abundance ratio of crystal textures of 50% or more across the diameter of the wire rod, and which outer periphery has a crystallographic orientation which is oriented in the <100> direction.

2. The metallic wire rod according to claim 1 , wherein the iridium-containing alloy is an alloy containing rhodium, platinum, and nickel.

3. The metallic wire rod according to claim 1 , wherein the metallic wire rod comprises an iridium-containing alloy, which iridium-containing alloy is present in the metallic wire rod in an amount up to 30 wt. % and the balance being platinum.

4. The metallic wire rod according to claim 1 , wherein an entire diameter of the wire rod has a biaxial crystal orientation and an abundance ratio of textures of 50% or more.

5. The metallic wire rod according to claim 2 , wherein the iridium-containing alloy comprises rhodium, platinum, and nickel in a total amount of up to 5% by weight, and the balance being iridium.

6. A method of manufacturing the metallic wire rod, the wire rod defined claim 1 , comprising:
a first step in which an ingot of iridium or an iridium-containing alloy is made into a rod-shape article by biaxial pressurization while intermediate heat treatment is performed, and a second step in which the rod-shape article undergoes wire drawing to be a wire rod, wherein hardness of the ingot in the first step is maintained in not more than 550 Hv, and temperatures of the intermediate heat treatment are set to be not more than the recrystallization temperature of the iridium or an iridium-containing alloy.

7. The method of manufacturing the metallic wire rod according to claim 6 , wherein the ingot of iridium or the iridium-containing alloy is manufactured by a rotation upward drawing process.

8. A method of manufacturing the metallic wire rod, the wire rod defined in claim 2 , comprising:
a first step in which an ingot of iridium or an iridium-containing alloy is made into a rod-shape article by biaxial pressurization while intermediate heat treatment is performed, and a second step in which the rod-shape article undergoes wire drawing to be a wire rod, wherein hardness of the ingot in the first step is maintained in not more than 550 Hv, and temperatures of the intermediate heat treatment are set to be not more than the recrystallization temperature of the iridium or an iridium-containing alloy.

9. The method of manufacturing the metallic wire rod according to claim 8 , wherein the ingot of iridium or the iridium-containing alloy is manufactured by a rotation upward drawing process.

Assignees

• Sakairi Koichi
• Tanaka Kunihiro
• Nakamura Muneki
• Seki Fumie
• Tanaka Precious Metal Ind

Inventors

• Sakairi Koichi
• Tanaka Kunihiro
• Nakamura Muneki
• Seki Fumie

Classifications

• C22C28/00 Primary

  Alloys based on a metal not provided for in groups C22C5/00 - C22C27/00 · CPC title

• H01T13/39

  Selection of materials for electrodes · CPC title

• C22F1/14

  of noble metals or alloys based thereon · CPC title

• C22C5/04 Primary

  Alloys based on a platinum group metal · CPC title

• B21C1/16

  Metal drawing by machines or apparatus in which the drawing action is effected by means other than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, rods or tubes · CPC title