Electrically-conductive material having excellent wear resistance and heat resistance
AssigneeTANAKA PRECIOUS METAL TECHNOLOGIES Co., Ltd.
InventorTerumasa Tsuruta
Life of this patent
Estimating the term…
Abstract
An electrically-conductive material containing Ag in an amount of 10 mass % or more and 70 mass % or less, Pd in an amount of 30 mass % or more and 90 mass % or less, Ni in an amount of more than 5 mass % and 45 mass % or less, and inevitable impurities. A ratio of a Ni content (mass %) to a Ag content (mass %) (Ni (mass %)/Ag (mass %)) is 0.1 or more and 5.0 or less, metal structures include a AgPd alloy phase and a PdNi alloy phase, and a volume ratio of the PdNi alloy phase is 18 vol % or more and 80 vol % or less. Ni is added in a high concentration to a AgPd alloy, and the amount of PdNi alloy phases generated as separate phases is controlled to strengthen the entire alloy.
Claims5
A DC motor comprising:
- a rotating shaft;
- a commutator provided on a periphery of the rotating shaft;
- and
- a brush contacting the commutator to supply a current, wherein
- the brush is formed of a first contact material at least at a contact surface with the commutator,
- the first contact material is formed of an electrically-conductive material comprising Ag in an amount of 10 mass % or more and 70 mass % or less, Pd in an amount of 30 mass % or more and 90 mass % or less, Ni in an amount of 11 mass % or more and 45 mass % or less, and inevitable impurities,
- a ratio of a Ni content (mass %) to a Ag content (mass %) (Ni (mass %)/Ag (mass %)) in the electrically-conductive material is 0.13 or more and 5.0 or less, and
- metal structures of the electrically-conductive material have a AgPd alloy phase and a PdNi alloy phase, and a volume ratio of the PdNi alloy phase is 18 vol % or more and 80 vol % or less.
Dependencies are inferred from the claim text.