JPS58151443A - Dry sintered friction material - Google Patents

Abstract

PURPOSE:To enhance the coefft. of friction and the thermal fading resistance by using prescribed percentages of Cu, Sn, Zn, metallic oxide particles with >=4 Moh's hardness, graphite, MoS2 and Mn. CONSTITUTION:The titled material consists of, by weight, 60-80% Cu, 3-10% Sn, <=15% Zn, 3-20% metallic oxide particles with >=4 Moh's hardness, 3-10% graphite, 1-5% MoS2 and <=15% Mn. The material has a high coefft. of friction and superior thermal fading resistance, and a stable friction surface is obtd. even under high-speed sliding.

Description

[Detailed description of the invention] The present invention is based on copper-based dry sintering** material KML, especially Plateau I.
This has been improved so that I-series numbers can be stably obtained.

Conventionally, dry sintered friction materials have been claimed to have a high JI11 friction stop count and seizure resistance, and to be resistant to thermal fade phenomena, water fade phenomena, etc. that appear as a decrease in the coefficient of friction.

However, conventional copper-based sintered materials have not been able to satisfy all of the above requirements, and there is a need for further development in terms of component composition. - In a dry sintered friction material made of a copper-based sintered alloy, the sintered alloy is
Weight ratio: 60-80% steel, 3-10% tin, 15% zinc
- The following provides a dry sintered** material containing gold oxide consisting of hard particles, 3 to 20-1 graphite, 3 to 10-1 molybdenum disulfide, and 1 to 5% mankanite. be.

The concept of the dry sintered friction material of the present invention will be explained below.

The dry sintered friction material of the present invention uses a sintered alloy consisting of copper, tin, and zinc as a matrix component. Regarding its composition, the weight ratio (the same applies hereinafter) to the entire sintered friction material is selected to be in the range of 60 to 80 -1 copper, 3 to 10 - 10 s of tin, and 15 or more of zinc. The selection criteria for this range is based on the stability of **&1i. In addition, these matrix materials have a % of material strength, stabilize the friction coefficient during braking, and also have a hard O11 surface due to heat generation between the hand plate and the hand plate. This hard oxide film is resistant to the water fade phenomenon and has excellent resistance to the thermal 7-ade phenomenon, resulting in a stable wear surface. . In this case, zinc has the meaning of substituting for tin, and is added within the range of %A without deteriorating the performance.

Furthermore, in the dry sintered sin material of the present invention, Al 2 (
It is enriched with 3 to 20-metal oxides consisting of hard particles of silica (5 to 2), mullite (3 to 2), and mullite (3 to 2). The selection criteria for this content is that it should be able to withstand high-grade loads and high-temperature abrasion and sliding. Therefore, the content is determined within the range of 3 to 20% depending on the aggressiveness against the mating material. In this case, these metal oxides increase the friction coefficient and also reduce the reaction product 4Bt- in the deposits generated in the l# silver.
It has a scraping effect. And if the quantity is too small,
This effect is small, and if the amount is too large, the opposing material will be attacked radically, so a range of 3 to 20% is suitable. The metal oxide preferably has a Mos hardness of 4 or more, where diamond is lO.

Further, the dry sintered friction material of the present invention has graphite 3 to 10-1
Contains 1-15% molypide disulfide (Mosg). These are generally shrines in different areas.
f! J111 when the temperature is exceeded and the temperature range is exceeded.
fIA9I% number ditto as a drug. and,
The dry sintered friction material of the present invention has a friction coefficient of about 0.4.
~06 and belongs to the high friction coefficient category.

Furthermore, in dry sintered friction materials (F3V), less than 115 fi of manganese is sometimes added. The addition of manganese reduces the oxide film of the sintered Chuya Kingyo, and improves the sinterability of the t11i.
i6 Melting action Kameru deroru. This is also because a part of the man's force / has an effective effect of stabilizing Mn0IK (friction = 1).

Therefore, the dry sintered friction material of the present invention is a material with a linear coefficient t-1r, has high resistance to thermal fade and water fade, and has improved aggressiveness against mating materials. It is something.

Next, one embodiment of the dry sintered friction material of the present invention will be described.

The samples were 1 to G made of the dry sintered friction material of the present invention, each having a component composition (unit weight) as shown in the following table.

The performance of the above-mentioned M~GK was compared using a constant speed 2 S* tester. This allows two test pieces to be connected to a PC! -20, and the conditions at that time were a sliding speed of 20 m/sea, and a surface pressure of 5%.

As a result, both A-D of the present invention have a high shore friction ratio at4
! - At the same time, it did not attack the opposing board and also had excellent heat fade resistance.

On the other hand, the X of the promotion rice vIl does not attack the opponent's board, but shows slightly inferior results in heat fade resistance, and the y has good heat resistance and fade resistance, but rarely attacks the opponent's board significantly. . Furthermore, G had 416 wrinkles due to its heat fade resistance, and attacked the opponent's board non-stop.

In addition, in the dry sintered friction material of the present invention, the effect of adding Mn is fusion, and a test sound of % maple was separately conducted for the amount of Mtl) added, and the results showed that the preferable range is 15-do or less. It also became clear that In particular, those exceeding 15- were excluded because they cause leaching during sintering and impair sintering workability.

See you again! Regarding 4# II compound 5c, a separate test was conducted,
It has been found that a Mohs hardness of 4 or higher is suitable, and that it can also be applied to metal extrusions such as mullite.

As explained above, the present invention provides a copper-based dry sintered friction material that achieves the following effects by making it have a predetermined component composition in which all manganese is added.

A dry sintered friction material having a high coefficient of friction is provided. In the present invention, a high coefficient of friction of about 0.4 to 0.6 is expected, and the heat fade resistance is also excellent.

This is particularly important in that a stable** surface can be obtained even under high frictional excitation, and it can be said to be highly suitable for automobiles.

(2) A dry sintered material with improved aggressiveness against the mating plate is provided. Generally speaking, the higher the coefficient of friction, the greater the amount of wear, and the more aggressive the opposing plate will be. However, in the present invention, while the coefficient of friction is high, the wear rate of the lid is also suppressed.

Therefore, the improvement in aggressiveness also leads to a decrease in PuruQ.

(3) A dry sintered friction material is provided which is also improved against the water fade phenomenon. The present invention is also resistant to water fading due to its base on a matrix of copper threads and the addition of manganese.
It is particularly suitable for exposed type two-wheeled vehicles. In this case, if stainless steel W4 is used as the mating plate, the problem of rust will be avoided at the same time.

Claims (1)

[Claims] 11) In a dry sintered friction material made of a copper-based sintered alloy, the sintered alloy has a weight ratio of 60 to 80 -1 copper and 3 to 1 tin.
0-1 zinc @ 15 or less, 3 to 20 metal oxides consisting of hard particles, graphite 3 to 10-1 molybdenum disulfide 1 to 5
A dry sintered** material characterized in that it contains less than 15% of manganese and manganese. (, 23) The metal oxide qIIJ is composed of hard particles having a Mohs hardness of 4 or more.Transition of the patent claim @II@paragraph 1--A binding friction material.