Patent ID: 11302602

Abstract:
A power-module substrate constructed by disposing a metal layer and a circuit layer comprising copper on a ceramic board; an aluminum layer; a copper layer; and a heat sink comprising an aluminum-impregnated silicon carbide porous body, wherein diffusion layers having an intermetallic compound of aluminum and copper are formed between the metal layer and the aluminum layer, between the aluminum layer and the copper layer, and between the copper layer and the aluminum-impregnated silicon carbide porous body, also wherein the circuit layer has a thickness t1 of 0.1-3.0 mm, the meta layer has a thickness t2 of 0.1-3.0 mm, a thickness t3 is not more than 3.0 mm, a thickness t4 is between 0.1 mm and 5.0 mm, and the ratio [(σ1×t1×A1)/{(σ2×t2×A2)+(σ3×t3×A3)+(σ4×t4×A4)}] falls within the range of 0.06-0.70.