Copper alloy material, commutator segment, and electrode material

Abstract

A composition includes Cr in a range of 0.3% by mass or more and 0.7% by mass or less, Zr in a range of 0.025% by mass or more and 0.15% by mass or less, Sn in a range of 0.005% by mass or more and 0.04% by mass or less, and P in a range of 0.005% by mass or more and 0.03% by mass or less, in which a balance is made of Cu and inevitable impurities, and a Vickers hardness at 20° C. is 149 Hv or higher.

1 . A copper alloy material having a composition comprising:
 Cr in a range of 0.3% by mass or more and 0.7% by mass or less;   Zr in a range of 0.025% by mass or more and 0.15% by mass or less;   Sn in a range of 0.005% by mass or more and 0.04% by mass or less;   P in a range of 0.005% by mass or more and 0.03% by mass or less; and   a balance consisting of Cu and inevitable impurities,   wherein a Vickers hardness at 20° C. is 149 Hv or higher.   
     
     
         2 . The copper alloy material according to  claim 1 ,
 wherein a Zr content [Zr] (% by mass) and a P content [P] (% by mass) have a relationship of   [Zr]/[P]>5.   
     
     
         3 . The copper alloy material according to  claim 1 ,
 wherein a Sn content [Sn] (% by mass) and a P content [P] (% by mass) have a relationship of   [Sn]/[P]≤5.   
     
     
         4 . The copper alloy material according to  claim 1 , further comprising:
 Si in a range of 0.005% by mass or more and 0.03% by mass or less.   
     
     
         5 . The copper alloy material according to  claim 1 ,
 wherein a total content of Mg, Al, Fe, Ni, Zn, Mn, Co, and Ti is 0.03% by mass or less.   
     
     
         6 . The copper alloy material according to  claim 1 ,
 wherein an electrical conductivity is 70% IACS or higher.   
     
     
         7 . The copper alloy material according to  claim 1 ,
 wherein a tensile strength is 470 MPa or higher.   
     
     
         8 . A commutator segment made of the copper alloy material according to  claim 1 . 
     
     
         9 . An electrode material made of the copper alloy material according to  claim 1 .