Patent ID: 8557015
Filing Date: 2013-10-15
Classification: B21B,B22F,C22C,C22F,H01L

Abstract:
1. A Cr—Cu alloy formed by powder metallurgy with a Cr powder, wherein Cr content is more than 30% to 80% or less by mass, the Cr—Cu alloy comprises flattened Cr phases directionally aligned along major axes of the flattened Cr phases in a Cu matrix, the average aspect ratio of the flattened Cr phases is more than 1.0 and less than 100, particle size of the Cr powder is in a range of 10 μm or more and 250 μm or less, fine particulate second Cr phases having a major axis of 100 nm or less and an aspect ratio of less than 10 are precipitated from the Cu matrix, and number density of the second Cr phases is at least 20 μm in a plate shape having a thickness direction, wherein a number of flattened Cr phases is 200/mm or less in the thickness direction, and a thermal expansion coefficient of 13×10