Lifetime improvement of contact brush units of automotive power machines. Part 1

Lifetime improvement of contact brush units of automotive power machines is suggested. Particularities of mass transfer of aluminium electrode on copper substrate is researched. The structure of aluminium electrospark coating on copper substrate is investigated. The fine dispersed eutectic structure with copper-aluminium solid solutions of electrospark coating is detected. This structure is suitable for good coating conductance and well coating adhesion for high speed application under electric current like a contact brush unit of alternators or commutator unit of power starters.