METHOD OF COAT APPLICATION ON COPPER CONTACTS OF ELECTRIC SWITCHING DEVICES Russian patent published in 2014 - IPC C23C14/34 C23C14/54 H01H1/02 

FIELD: metallurgy.

SUBSTANCE: proposed method comprises ion-plasma spraying of molybdenum on copper contact. Spraying is started at voltage across copper contact of 1100-1500 V and heating to volumetric temperature of 180-230°C.Then, spraying is conducted at reference voltage across copper contact of 110-130 V to make 2-4 mcm-thick coat layer. Then, voltage is increased across copper contact to 1100-1500 V to allows spraying duration of 0.3-0.5 of that for spraying said one mcm-thick coat. Thereafter, spraying is performed at voltage increased many times to said increased voltage and decreased to said reference voltage to produce required thickness.

EFFECT: higher spark erosion resistance of copper contacts, longer life of switching devices.

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