Sputtering target and its manufacturing method
First Claim
1. A method for manufacturing a sputtering target, the method comprising:
- presenting an alloy powder which contains at least 65 weight percent of at least one rare earth alloy powder, wherein the at least one rare earth alloy powder comprises at least one rare earth element, at least two elements selected from the group consisting of Fe, Co, Ni, Cr and Si, and at least one recycled alloy powder prepared by using a target used at least once for sputtering;
melting the alloy powder; and
atomizing the melted alloy powder, wherein the alloy powder includes no more than 0.1 weight percent metal impurities from a crushing member.
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Accused Products
Abstract
An ingot is made from a used target of 30 weight % or more, and new metals of the same components, and recycled alloy powder is made by a gas atomizing process. Magnetic permeability is controlled not to exceed 2 by adjusting the content of rare earth metals in rare earth alloy powder to be at least 35 weight %. By blending the recycled alloy powder with other powder to produce alloy powder containing at least 50 weight % of rare earth alloy powder having a magnetic permeability not higher than 2 and containing at least 65 weight % of rare earth alloy powder. By sintering the alloy powder under pressure and thereafter cutting top, bottom and side surfaces of the sintered material, a target having a magnetic permeability not higher than 2 and having a thickness not less than 8 mm is fabricated.
71 Citations
9 Claims
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1. A method for manufacturing a sputtering target, the method comprising:
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presenting an alloy powder which contains at least 65 weight percent of at least one rare earth alloy powder, wherein the at least one rare earth alloy powder comprises at least one rare earth element, at least two elements selected from the group consisting of Fe, Co, Ni, Cr and Si, and at least one recycled alloy powder prepared by using a target used at least once for sputtering;
melting the alloy powder; and
atomizing the melted alloy powder, wherein the alloy powder includes no more than 0.1 weight percent metal impurities from a crushing member. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification