JPS60159139A - Sliding contact material - Google Patents

Abstract

PURPOSE:To obtain a sliding contact material having superior wear resistance and enabling the stable rotation of a micromotor under high load by adding specified elements to an Ag-Pd alloy for a sliding contact having a high Pd content. CONSTITUTION:An alloy consisting of 50-80% Pd, 1-5% at least one among Zn, In, Sn and Pb, 0-0.1% at least one among Fe, Co and Ni, and the balance Ag is used as a sliding contact material for the high-speed rotation of a micromotor or the like. An intermetallic compound consisting of Ag or Pd and at least one among Zn, In, Sn and Pb is produced in the matrix to improve the mechanical characteristics and to inhibit the formation of brown powder by the catalytic action of Pd. Reduction in the grain size of the matrix is accelerated by at least one among Fe, Co and Ni, so the sliding contact material has superior wear resistance.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sliding contact material for micro motors and the like, and particularly to a sliding contact material that is effective in the case of high loads.

Ag, which has traditionally been used as one of the sliding contact materials
- Pd binary alloys have the disadvantage that brown powder is generated due to the catalytic action of Pd in high Pd content systems, and the hardness is low due to the lower work hardening rate compared to multi-component alloys. However, these drawbacks mean that when used as a sliding material for high-speed rotation in micro motors, etc., noise is likely to occur due to adhesive wear and brown powder generated on the sliding contact surface, and rotational unevenness may occur. It is the cause of the occurrence.

The present invention aims to solve the above-mentioned drawbacks and is characterized by providing a sliding contact material that provides stable high-speed rotation even under high loads and has excellent wear resistance.

The present invention will be explained below.

In the present invention, Pd and Zn are contained in a weight ratio of 50 to 80% in Ag.

At least one of In, Sn, and Pb is added in an amount of 1 to 5 on the gold side, and furthermore, Pd is added to Ag in a weight ratio.
50-80%! : At least one of Zn, In, Sn, and Pb is added in an amount of 1 to 5, and at least one of Fe, Co, and Ni is added in an amount of 0.01 to 0.5.

In general, in order to improve the wear resistance of micromotor sliding contact materials during high-speed rotation and to obtain stable contact resistance, the mechanical properties must be improved, and the generation of brown powder as described above must be avoided on the sliding surfaces. By using a material that can be pressed down, the present invention satisfies these conditions by having the above-described configuration.

In other words, the present invention has a weight ratio of 50 to 80 inches of Pd in Ag.
By adding 1 to 5% of at least one of Zn, In, Sn', and Pb, Ag or P
An intermetallic compound with P or a similar compound is produced in the matrix to improve mechanical properties.
It relaxes the catalytic action of d.

Furthermore, the addition of Fe, Co, and Ni promotes the grain size refinement of the matrix.

Incidentally, outside the addition range of the present invention, excessive additives precipitate in the matrix 9 and the above-mentioned effects do not occur.

Next, a conventional Ag-Pd binary alloy and a sliding contact of the present invention will be explained.

As an example, a conventional product having the composition shown in Table 1 and the contact material of the present invention are mixed into a predetermined alloy composition, and then a master alloy with other elements except Ag and Pd is prepared in a Tammann furnace with an inert gas introduced. After suctioning this master alloy and Pd in a vacuum melting furnace with 10 Hg i, argon gas k 20
Introducing 0'Torrl and performing high frequency melting, this was
It was heated at 00°C for 5 hours and subjected to rolling with a cross-section reduction rate of 50%, and as shown in the figure, the thickness was Q, 3mm, and the diameter was 40mm.
Make a flat disk 1 between the two and place this disk 1 30m from the center.
Diameter 0.2 made of Au-Ag-Pd-Pt at the location
A sliding test was carried out by sliding brush material 2 consisting of three pieces of 5 pieces and 8 pieces in length facing each other, and the results shown in Table 1 were obtained. It took some time for the noise level to reach 10% of the bias voltage.

Table 1 Test conditions Voltage 12V Current 100mA Sliding contact material rotation speed 150 Orpm Brush contact pressure 6273 As is clear from Table 1 above, this test was performed in a system with the same Pd content compared to the conventional example. The example has excellent mechanical properties and therefore excellent noise resistance.

As explained in detail above, the present invention has excellent noise resistance, that is, wear resistance, and is very effective as a sliding contact that provides stable rotation even in micro motors and the like that are subjected to high loads.

[Brief explanation of drawings]

The drawing is a perspective view showing a sliding test. 1... Disk 2... Brush material Patent applicant: Tokuriki Honten Co., Ltd. Representative Patent Attorney Takashi Kim Kura

Claims (1)

[Claims] 1. Pd, 50-80% by weight and Zn in Ag. At least one of In, Sn, and Pb is added to the gold side for 1 to 5 times, and at least one of Fe, Co, and Ni is added for a total of 0 to 5 times.
Sliding contact material with 0.1% addition.