US 10,311,991 B2 · High-strength and high-electrical conductivity copper alloy rolled sheet and method of manufacturing the same

Abstract

A high-strength and high-electrical conductivity copper alloy rolled sheet has an alloy composition containing 0.14 to 0.34 mass % of Co, 0.046 to 0.098 mass % of P, 0.005 to 1.4 mass % of Sn and the balance including Cu and inevitable impurities, wherein [Co] mass % representing a Co content and [P] mass % representing a P content satisfy the relationship of 3.0≤([Co]−0.007)/([P]−0.009)≤5.9. In a metal structure, precipitates are formed, the shape of the precipitates is substantially circular or elliptical, the precipitates have an average grain diameter of 1.5 to 9.0 nm, or 90% or more of all the precipitates have a diameter of 15 nm or less to be fine precipitates, and the precipitates are uniformly dispersed. With the precipitation of the fine precipitates of Co and P and the solid-solution of Sn, the strength, conductivity and heat resistance are improved and a reduction in costs is realized.

Claims24

Dependent claims

A high-strength and high-electrical conductivity copper alloy rolled sheet that has an alloy composition comprising:

(a) 0.14 to 0.34 mass % of Co;
(b) 0.046 to 0.098 mass % of P;
(c) 0.005 to 0.095 mass % of Sn;
and
(d) the balance including Cu and inevitable impurities,
wherein [Co] mass % representing a Co content and [P] mass % representing a P content satisfy a relationship of 3.0≤([Co]−0.007)/([P]−0.009)≤5.9,
wherein the copper alloy rolled sheet includes precipitates and the precipitates are based on Co and P,
wherein a range of a numerical expression 1.2×[Ni]+2×[Fe]≤[Co] is satisfied even if the alloy composition includes Fe and Ni as the inevitable impurities, and
wherein the shape of the precipitates is circular or elliptical on a two-dimensional observation plane, wherein the precipitates have an average grain diameter of 1.5 to 9.0 nm, or 90% or more of all the precipitates have a diameter of 15 nm or less so as to be fine precipitates, and the precipitates are uniformly dispersed in the alloy composition.

6 more elements

A high-strength and high-electrical conductivity copper alloy rolled sheet that has an alloy composition consisting of:

(a) 0.14 to 0.34 mass % of Co;
(b) 0.046 to 0.098 mass % of P;
(c) 0.005 to 0.095 mass % of Sn;
and
(d) the balance including Cu and inevitable impurities,
wherein [Co] mass % representing a Co content and [P] mass % representing a P content satisfy a relationship of 3.0≤([Co]−0.007)/([P]−0.009)≤5.9,wherein the copper alloy rolled sheet includes precipitates and the precipitates are based on Co and P,
wherein a range of a numerical expression 1.2×[Ni]+2×[Fe]≤[Co] is satisfied even if the alloy composition includes Fe and Ni as the inevitable impurities, and
wherein the shape of the precipitates is circular or elliptical on a two-dimensional observation plane, wherein the precipitates have an average grain diameter of 1.5 to 9.0 nm, or 90% or more of all the precipitates have a diameter of 15 nm or less so as to be fine precipitates, and the precipitates are uniformly dispersed in the alloy composition.

5 more elements

Dependencies are inferred from the claim text.

High-strength and high-electrical conductivity copper alloy rolled sheet and method of manufacturing the same

Life of this patent

High-strength and high-electrical conductivity copper alloy rolled sheet and method of manufacturing the same

Life of this patent

Abstract

Claims24