JPS58107454A - Material for slide contact - Google Patents

Abstract

PURPOSE:To provide a slide contact material of which anti-wear property is enhanced while oxidation is suppressed and contact resistance is stabilized at a low level, obtained by respectively adding Mn and one kind or more of In, Sb and P to Ag in a predetermined ratio to increase the hardness of an Ag-Mn alloy. CONSTITUTION:This slide contact material is constituted from an Ag-Mn alloy obtained by adding 1-10wt% Mn, 0.1-3wt% one kind or more In, Sb and P and additional 0.01-0.5wt% Fe group element to Ag. Because this slide contact material is high in hardness and excellent in anti-wear property, the contact element of the rectifier of a small motor produced by using this material generates no abraded powder in slide contact with a brush contact point. Therefore, because noise is not generated and contact resistance is stabilized at a low level, irregularity in the rotary number of the rectifier of the small motor is reduced to a large extent.

Description

[Detailed description of the invention] The present invention relates to improvements in sliding contact materials.

Conventionally, 9A has excellent sulfidation resistance as one of the sliding contact materials.
g-M n alloys have been used, but kg-M n
The alloy has low hardness and poor wear resistance, so A g −
If Mn alloy is used as a contact piece for the outer periphery of a commutator of a small motor, abrasion powder will be generated by contact with the brush contact, which may cause noise generation.

The present invention has been made to eliminate such drawbacks, i.
It is an object of the present invention to provide a sliding contact material which increases the hardness of the Ag-Mn alloy and improves its wear resistance, suppresses vce formation, and has a low and stable contact resistance.

One of the sliding contact materials of the present invention is gSMn1-1 in Ag.
0% and at least one of Is, 8b, and P in total from 0.1 to
It is made by adding 3W/).

Another sliding contact material of the present invention is M in Ag.
n 1 #10'', 10 and at least one type of In, 8b, P with a total of Te 0.1-3''/, Fa group 0.01~
It is made by adding 0.54.

In the sliding contact material of the present invention, K1- in Ag
The purpose of adding 10''/Mn is to improve the sulfidation resistance of Ag; this effect does not appear when IW/) is not contaminated, and when it exceeds 10-, a large amount of oxide is produced. It has a high resistance and is unstable, so it is also a stone, In, 8b, P.
Adding at least one type of 0.1 to 3% in total is A.
This is to increase the hardness of Ag-Mn and improve wear resistance by dispersing an intermetallic compound of the above elements and Mn in addition to the solid solution of ll and Mn. There are few precipitates of the compound and the dispersion is insufficient, making it impossible to increase the hardness of A g -Mn, and the wear resistance cannot be improved.
If it exceeds -, there will be many and large precipitated particles of the intermetallic compound with Mn, and the particles will be oxidized, resulting in high contact resistance and instability. If it is less than 0.5%, the crystal grains cannot be refined, and if it exceeds 0.5%, it will not be alloyed and will precipitate as a single large lump during ki, resulting in high contact resistance, large variations, and instability. .

Next, 11 skin pieces of a commutator for a nine-sized small motor made of the present I51IK sliding contact material and a conventional sliding contact material will be described.

With the sliding contact material according to the embodiment of the present invention and the conventional sliding contact material having the compositions shown in the right column of the table below, a small Tanabata with a diameter of 6 cm and a length of 6 cm is used as shown in the drawing. Se, this contact piece 1
%Au- on the top and bottom of the outer peripheral surface of a.

Diameter 0.25 m consisting of A g -Cu -P t
, a brush 4iI6 having three brush wires 2 with a length of 10
3 were brought into sliding contact so as to face each other, and a commutator rotation test was conducted for 10 rotations under the test conditions described below, and the amount of wear on the contact piece 11 and the variation in the number of 10 rotations of the commutator were measured. The results shown in the column were obtained.

Test conditions Voltage: 12V Current: DC59mA Rotation speed of commutator: 2800rpffl Rotation time of commutator - 500 hours Contact crab of brush contact 5F73 wear amount was 5 to 6μ, whereas in the example ! It can be seen that the amount of wear of one conductor piece is significantly reduced between 2 and 41 SJl, indicating excellent wear resistance. The variation in the rotational speed of the commutator with contact pieces in the conventional example was 7 to 10-1, whereas the variation in the rotational speed of the commutator with the i1 waste piece in the example was 2 to 3.5. It can be seen that there is a significant decrease in -.

The sliding contact material of the present invention described in detail above has high hardness and excellent wear resistance, so the contact pieces of the commutator of a small motor made using this material wear out when exposed to brushes. No powder is generated. Therefore, no noise is emitted and the contact resistance is low and stable, resulting in excellent effects such as a significant reduction in variations in the rotational speed of the small rectifier. .

[Brief explanation of the drawing]

The figure is a perspective view showing the state of contact between the commutator and brush contacts of a small motor. l... Commutator, 1! l...471 pieces,
2...Brush wire, 3...Brush contact.

Claims (1)

[Claims] 1) %Mn1. m10%, In, and Sb. A sliding contact material containing at least one type of P in a total amount of 0.1 to 3"510. In Ag [%Mnl-10- and In, 8b. At least one type of P in a total amount of 0.1 to 3"510. 3- and re group to 0.
01~0.5- Sliding contact material formed by adding.