Cu-diamond based solid phase sintered body having excellent heat resistance, heat sink using the same, electronic device using the heat sink, and method for producing Cu-diamond based solid phase sintered body

摘要

An inexpensive Cu-diamond based composite material having excellent heat conductivity and heat resistance. Conventionally, an infiltration method does not provide a Cu-diamond based composite material having high heat conductivity; an ultrahigh pressure method is expensive; and electric current pressure sintering provides relatively high heat conductivity, a low cost, but insufficient heat resistance. A Cu-diamond based solid phase sintered body contains 2 vol% or more and 6 vol% or less of Cr, and 30 vol% or more and 80 vol% or less of diamond particles containing 20 vol% or more of a high crystallinity diamond component.