Copper alloy sputtering target and manufacturing method of copper alloy sputtering target

Patent metadata

Field	Value
Publication number	US-10062552-B2
Application number	US-201414333812-A
Country	US
Kind code	B2
Filing date	Jul 17, 2014
Priority date	Jul 31, 2013
Publication date	Aug 28, 2018
Grant date	Aug 28, 2018

Abstract

A copper alloy sputtering target is formed by a copper alloy including the content of Ca being 0.3 to 1.7% by mass, the total content of Mg and Al being 5 ppm or less by mass, the content of oxygen being 20 ppm or less by mass, and the remainder is Cu and inevitable impurities. A manufacturing method of a copper alloy sputtering target comprises steps of: preparing a copper having purity of 99.99% or more by mass; melting the copper so as to obtain a molten copper; controlling components so as to obtain a molten metal having a predetermined component composition by the addition of Ca having a purity of 98.5% or more by mass into the molten copper and by melting the Ca; casting the molten metal so as to obtain an ingot; and performing stress relieving annealing after performing hot rolling to the ingot.

First claim

What is claimed is:

1. A copper alloy sputtering target formed by a copper alloy comprising:
the content of Ca being 0.3 to 1.7% by mass;
the total content of Mg and Al being 5 ppm or less by mass;
the content of oxygen being 20 ppm or less by mass; and
the remainder being Cu and inevitable impurities,
wherein Fe, Mn and Si are contained as the inevitable impurities in the copper alloy sputtering target, and
the content of Fe is 1 ppm or less by mass, the content of Mn is 1 ppm or less by mass, and the content of Si is 1 ppm or less by mass so that the contents of Mg, Al, Fe, Mn, and Si are minimized to suppress a generation of Ca-based complex oxide and to reduce the Ca-based complex oxide appearing on the surface of the sputtering target.

Assignees

• Mitsubishi Materials Corp

Inventors

• Mori Satoru
• Sakamoto Toshio
• Ookubo Kiyoyuki

Classifications

• H01J37/3429 Primary

  Plural materials · CPC title

• C22C1/02

  by melting {(C22C1/1036 takes precedence)} · CPC title

• B22D11/108

  Feeding additives, powders, or the like · CPC title

• B22D11/004

  Copper alloys · CPC title

• H01J37/3491

  Manufacturing of targets · CPC title