METHOD OF MAKING THICK-FILM CONTACTS BASED ON ALLOYS OF REFRACTORY METALS Russian patent published in 2024 - IPC H10N10/01 

FIELD: various technological processes.

SUBSTANCE: use for making contacts in production of thermoelements. Essence of the invention consists in the fact that the thick-film contacts manufacturing method includes the TEM surface cleaning, on which a film of alloys of refractory metals is applied, while the refractory metals used are alloys based on Co-W and Ni-W, which are formed on TEM based on Bi₂Te₃, Sb₂Te₃, PbTe and GeTe, surface of which is mechanically treated to a roughness not exceeding the thickness of the formed film, then the surface of TEM is chemically treated Bi₂Te₃, Sb₂Te₃, in 20 % solution of HNO₃, PbTe in 20 % solution of CH₃COOH at room temperature and GeTe in 30 % NaOH at temperature 50–70 °C, electrochemical deposition of Co-W alloys is carried out from a solution containing CoSO₄⋅7H₂O 0.032–0.037 mol/L; Na₂WO₄ 0.20–0.21 mol/L; (NH₄)₂SO₄ 1.8–2 mol/L; NH₄OH 0.8–0.9 mol/L; NaOH 0.4–0.5 mol/L, at pH=13–14, temperature 50–60 °C and current density 12–20 A/dm², and electrochemical deposition of Ni-W alloys is carried out from a solution containing NiSO₄⋅7H₂O 0.04–0.05 mol/L; Na₂WO₄ 0.22–0.24 mol/L; NH₄Cl 0.95–1.05 mol/L; Na₃C₆H₅O₇ 0.75–0.85 ml/l, at pH=8.5, temperature 80–98 °C and current density 8–12 A/dm².

EFFECT: providing the possibility of: improving barrier properties, increasing adhesion strength, reducing contact resistance and increasing thermal stability of contacts.

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