Sliding contact material and method for manufacturing same

Patent metadata

Field	Value
Publication number	US-10378086-B2
Application number	US-201515527422-A
Country	US
Kind code	B2
Filing date	Dec 17, 2015
Priority date	Dec 26, 2014
Publication date	Aug 13, 2019
Grant date	Aug 13, 2019

Abstract

The present invention is a sliding contact material having a composition of Cu of 6.0% by mass or more and 9.0% by mass or less, Ni of 0.1% by mass or more and 2.0% by mass or less, an additive element M of 0.1% by mass or more and 0.8% by mass or less, and the balance being Ag. The additive element M is at least one element selected from the group consisting of Sm, La and Zr. The present sliding contact material has a material structure in which dispersion particles containing an intermetallic compound containing at least both Ni and an additive element M are dispersed in an Ag alloy matrix. It is required that the ratio of a Ni content (% by mass) and a content of an additive element M (% by mass) (K Ni /K M ) in the dispersion particles falls within a predetermined range. The present invention is an Ag alloy-based sliding contact material more excellent also in abrasion resistance than conventional ones, and a material adaptable to higher rotation numbers of micromotors.

First claim

The invention claimed is:

1. A sliding contact material, comprising:
Cu of 6.0% by mass or more and 9.0% by mass or less;
Ni of 0.1% by mass or more and 2.0% by mass or less;
an additive element M of 0.1% by mass or more and 0.8% by mass or less; and the balance being Ag and inevitable impurities, wherein: the additive element M is at least one element selected from the group consisting of Sm, La and Zr;
the sliding contact material has, as a material structure thereof, a material structure in which dispersion particles containing an intermetallic compound containing at least both of Ni and an additive element M are dispersed in an Ag alloy matrix; and a ratio of a Ni content (% by mass) and a content of an additive element M (% by mass) (KNi/KM) in the dispersion particles falls within a range below,
when an additive element M is Sm or La: 1.50 or more and 2.50 or less; when an additive element M is Zr: 1.80 or more and 2.80 or less.

2. The sliding contact material according to claim 1 , comprising Sm as an additive element M, and having a ratio of Ni concentration (S Ni : % by mass) and concentration of an additive element M (S M : % by mass) (S Ni /S M ) of 0.80 or more and 5.0 or less.

3. The sliding contact material according to claim 1 , comprising La as an additive element M, and having a ratio of Ni concentration (S Ni : % by mass) and concentration of an additive element M (S M : % by mass) (S Ni /S M ) of 1.50 or more and 5.0 or less.

4. The sliding contact material according to claim 1 , comprising Zr as an additive element M, and having a ratio of Ni concentration (S Ni : % by mass) and concentration of an additive element M (S M : % by mass) (S Ni /S M ) of 1.40 or more and 6.7 or less.

5. The sliding contact material according to claim 1 , comprising Zn of 0.1% by mass or more and 2.0% by mass or less.

6. The sliding contact material according to claim 1 , comprising Mg of 0.05% by mass or more and 0.3% by mass or less.

7. A method for manufacturing a sliding contact material, the material being defined in claim 1 , comprising a step of generating molten metal of an Ag alloy and subsequently cooling and solidifying the molten metal, wherein:
the molten metal of an Ag alloy comprises Cu of 6.0% by mass or more and 9.0% by mass or less, Ni of 0.1% by mass or more and 2.0% by mass or less, an additive element M of 0.1% by mass or more and 0.8% by mass or less, the balance being Ag and inevitable impurities;
temperature of the molten metal of the Ag alloy before the cooling is 1300° C. or higher; and
a cooling rate in cooling is set to be 100° C./min or larger,
thereby producing the sliding contact material of claim 1 .

8. A cladding material formed by combining either Cu or a Cu alloy with the sliding contact material being defined in claim 1 .

9. The sliding contact material according to claim 2 , comprising La as an additive element M, and having a ratio of Ni concentration (S Ni : % by mass) and concentration of an additive element M (S M : % by mass) (S Ni /S M ) of 1.50 or more and 5.0 or less.

10. The sliding contact material according to claim 2 , comprising Zr as an additive element M, and having a ratio of Ni concentration (S Ni : % by mass) and concentration of an additive element M (S M : % by mass) (S Ni /S M ) of 1.40 or more and 6.7 or less.

11. The sliding contact material according to claim 3 , comprising Zr as an additive element M, and having a ratio of Ni concentration (S Ni : % by mass) and concentration of an additive element M (S M : % by mass) (S Ni /S M ) of 1.40 or more and 6.7 or less.

12. The sliding contact material according to claim 2 , comprising Zn of 0.1% by mass or more and 2.0% by mass or less.

13. The sliding contact material according to claim 3 , comprising Zn of 0.1% by mass or more and 2.0% by mass or less.

14. The sliding contact material according to claim 4 , comprising Zn of 0.1% by mass or more and 2.0% by mass or less.

15. The sliding contact material according to claim 2 , comprising Mg of 0.05% by mass or more and 0.3% by mass or less.

16. The sliding contact material according to claim 3 , comprising Mg of 0.05% by mass or more and 0.3% by mass or less.

17. A method for manufacturing a sliding contact material, the material being defined in claim 2 , comprising a step of generating molten metal of Ag alloy and subsequently cooling and solidifying the molten metal, wherein:
the molten metal of an Ag alloy comprises Cu of 6.0% by mass or more and 9.0% by mass or less, Ni of 0.1% by mass or more and 2.0% by mass or less, an additive element M of 0.1% by mass or more and 0.8% by mass or less, the balance being Ag and inevitable impurities;
temperature of the molten metal of the Ag alloy before the cooling is 1300° C. or higher; and
a cooling rate in cooling is set to be 100° C./min or larger,
thereby producing the sliding contact material of claim 2 .

18. A method for manufacturing a sliding contact material, the material being defined in claim 3 , comprising a step of generating molten metal of an Ag alloy and subsequently cooling and solidifying the molten metal, wherein:
the molten metal of an Ag alloy comprises Cu of 6.0% by mass or more and 9.0% by mass or less, Ni of 0.1% by mass or more and 2.0% by mass or less, an additive element M of 0.1% by mass or more and 0.8% by mass or less, the balance being Ag and inevitable impurities;
temperature of the molten metal of the Ag ahoy before the cooling is 1300° C. or higher; and
a cooling rate in cooling is set to be 100° C./min or larger,
thereby producing the sliding contact material of claim 3 .

19. A cladding material formed by combining either Cu or a Cu alloy with the sliding contact material being defined in claim 2 .

20. A cladding material formed by combining either Cu or a Cu alloy with the sliding contact material being defined in claim 3 .

Assignees

• Tanaka Precious Metal Ind

Inventors

• Asada Takao
• Niitsuma Takumi
• Takahashi Masahiro
• Tsuruta Terumasa

Classifications

• C22C5/06

  Alloys based on silver · CPC title

• H01R43/12

  Manufacture of brushes · CPC title

• C22F1/14

  of noble metals or alloys based thereon · CPC title

• H01B1/026

  Alloys based on copper · CPC title

• H01R39/20

  characterised by the material thereof · CPC title