Thermoelectric power module

摘要

A thermoelectric power module capable of withstanding a long time use in a high temperature environment where a temperature (Th) of a higher temperature portion exceeds 250° C. The thermoelectric power module includes: a thermoelectric power element; a first diffusion prevention layer consisting of molybdenum (Mo) and disposed on a surface of the thermoelectric power element; a second diffusion prevention layer consisting of an intermetallic compound of nickel-tin (Ni—Sn) and disposed on a surface of the first diffusion prevention layer opposite to the thermoelectric power element side; an electrode; a third diffusion prevention layer consisting of an intermetallic compound of nickel-tin (Ni—Sn) and disposed on a surface of the electrode; a solder layer containing lead (Pb) at not less than 85% and configured to join the second diffusion prevention layer and the third diffusion prevention layer to each other.

主权项

1. A thermoelectric power module comprising:
a thermoelectric power element; a first diffusion prevention layer consisting essentially of molybdenum (Mo) and disposed on a surface of said thermoelectric power element; a second diffusion prevention layer consisting essentially of an intermetallic compound of nickel-tin Ni—Sn selected from the group consisting of Ni3Sn having enthalpy of formation of −24.9 kJ/mol Ni3Sn having enthalpy of formation of −34.6 kJ/mol and Ni3Sn4 having enthalpy of formation of −24.0 kJ/mol when the intermetallic compound is produced from nickel, said second diffusion prevention layer being disposed on a surface of said first diffusion prevention layer opposite to said thermoelectric power element side; an electrode formed of copper (Cu); a third diffusion prevention layer consisting essentially of the intermetallic compound of nickel-tin (Ni—Sn) and disposed on a surface of said electrode so as to surround said electrode; and a solder layer containing lead (Pb) at not less than 85% and configured to join said second diffusion prevention layer and said third diffusion prevention layer to each other.