Patent ID: 7378053

Claim:
A method for producing a copper-based material with low thermal expansion and high heat conductivity, which consists of the steps: adding 5 to 60% by mass of iron-based alloy powder having a thermal expansion coefficient of 6×10 −6 /K or lower as measured below 100° C. into a matrix powder consisting of precipitation hardening copper alloy powder, mixing said iron-based alloy powder and said matrix powder to form a powder mixture of them, compacting said powder mixture under pressure into a green compact having a relative density of 93% or more, and sintering said green compact at a temperature in the range of 400 to 600° C., wherein said method does not include additional solution treatment or additional aging treatment, wherein said precipitation hardening copper alloy powder is prepared by rapid solidification of molten precipitation hardening copper alloy, the particles of said precipitation hardening copper alloy powder are smaller than 100 mesh and the content of the powder having a particle size of 50 μm or more is 70% or less, and the particles of said iron-based alloy powder are smaller than 100 mesh and the content of the powder having a particle size of 50 μm or less is 60% or less.