Method for manufacturing thermoelectric conversion module
This method is for manufacturing a thermoelectric conversion module in which a first conductive member, a thermoelectric conversion element, a second conductive member are joined by joining members, the method comprising: a step for, after applying on the first conductive member a first paste including metal particles, disposing the thermoelectric conversion element on the first paste, and compressing and spreading the first paste; a step for disposing the second conductive member, after applying a second paste including metal particles in a controlled amount, on the thermoelectric conversion element, and compressing and spreading the second paste; and a step for sintering the first and the second pastes to obtain joining members.
1. A method for manufacturing a thermoelectric conversion module in which a first conductive member, a thermoelectric conversion element, and a second conductive member are joined by a joining member, comprising:
applying a first paste containing copper nanoparticles onto the first conductive member, disposing the thermoelectric conversion element on the first paste, and compressing and spreading the first paste;
applying a second paste containing copper nanoparticles onto the thermoelectric conversion element in a controlled amount, disposing the second conductive member, and compressing and spreading the second paste; and
sintering the first paste and the second paste to obtain the joining member,
wherein the first paste and the second paste have a relationship between a shear rate and a viscosity such that an inclination on a side with a large shear rate is smaller than an inclination on a side with a small shear rate,
wherein a mechanical dispenser having a screw is used to apply the first paste and the second paste in the controlled amount, wherein a number of screw rotations is 5 to 15 rpm and wherein the copper nanoparticles have an average size greater than 20 nm and less than 500 nm.
2. The method for manufacturing the thermoelectric conversion module according to claim 1 ,
wherein the first paste and the second paste contain a dispersant and a thickener to maintain dispersion in a sedimentation test,
a ratio of the thickener to a volume of only a solvent excluding the copper nanoparticles is 30 vol % or more and 90 vol % or less.
3. The method for manufacturing the thermoelectric conversion module according to claim 1 ,
wherein the first paste and the second paste are spread over a range excluding at least a part of a corner part of a joint surface of the thermoelectric conversion element.