JPS58126948A - Dry sintered friction material - Google Patents

Abstract

PURPOSE:To obtain a dry sintered friction material with a high coefft. of friction by preparing a sintered alloy contg. specified percentages of Cu, Sn, alumina, silica, graphite, molybdenum disulfide and calcium fluoride. CONSTITUTION:A bronze type sintered alloy contg., by weight, 60-80% Cu, 3- 20% Sn, 3-20% alumina and/or silica, 3-10% graphite, 1-5% molybdenum disulfide and <=10% calcium fluoride is prepared. This alloy is used as a dry sintered friction material having improved attacking action on its opposite material.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bronze-based dry type 111 Ayu friction material,
It is important to improve the coefficient of friction and improve the aggressiveness against opposing materials.

Conventionally, asbestos-based dry friction materials, including dry-type friction latches and brake pipes, have had the problem of decreasing friction coefficients due to the heat suede phenomenon and water 7-ade phenomenon, and bronze-based friction materials have suffered from slight friction due to the water 7-ade phenomenon. Although the decrease was small, there was a negative point of 62 points in that the coefficient of friction was low compared to the asbestos-based friction material.

Furthermore, increasing the coefficient of friction increases wear, and it is required to suppress the above-mentioned contradictory problems, and in particular, 111 shots are required from the viewpoint of material composition.

The present invention has been made strictly on the above points, and is a dry sintered friction material made of a bronze-based sintered alloy.
To provide a dry sintered friction material which is made of alumina and/or silica T3 and whose aggressiveness against a mating plate is also improved.
Therefore, the dry sintered friction material of the present invention will be explained below by dividing it into a matrix component, a wear-resistant component, and a lubricating component for convenience.

(11) Matrix component The dry sintered friction material of the present invention uses a bronze-based sintered alloy tube as the 17th matrix component. Conventional asbestos-based friction materials have a high shore friction coefficient, but have low resistance to the aforementioned thermal fade phenomenon and water fade phenomenon. Manen iron-based sintered friction materials,
Defects such as rust problems and low wear resistance t1f.

Therefore, in the present invention, we focused on a bronze-based matrix material, and as its composition, the weight ratio (the same applies hereinafter) is copper 6
0-80 Yu, tin 3-20'lli.

Range t - Select Next. This range is rather typical for conventional bronze group matrix ranges. However, the selection criterion is based on the stability of the wear surface. That is, the bronze-based matrix material is related to material strength and requires the above addition amount in order to stabilize the 1111Iib# friction number and suppress the occurrence of v cracks and increase in wear.

(2J wear-resistant component #!Ao dry sintered friction material has as a wear-resistant component,
Alumina (muttios) and/or acid silica (8
10! ) i 3-20- Contains. This content is the same as the conventional range, but has the effect of increasing the coefficient of friction and scraping off deposits and reaction products generated during friction. However, if there is too much, the range will be appropriately selected to attack the opponent material depending on the aggressiveness towards the opponent material.

(3) - Lubricating component The dry sintered friction material of the present invention contains graphite 3 as a lubricating component.
~10%, molybdenum disulfide (mosz) 1-15%,
and p-lucium heptafluoride (OaF!) 10- or less. The selection criteria were selected based on improved aggressiveness against mating materials and retention of a high coefficient of friction in high temperature conditions.

In other words, when the temperature rises, these components such as graphite,
Mo8z and 0aFl exhibit lubricity in the respective temperature ranges in this order, and act as friction coefficient improvers when the temperature exceeds the respective temperature ranges.

And especially Ca1F! is fI4I4 under high temperature friction conditions.
From the experimental results of Yogameri and Hashira, it was found that it has a remarkable effect on improving the aggressiveness against opponent materials.

Page 5 Please note that lead (pb) and zinc (Zn) are common ingredients.
) is not added based on the knowledge that a high coefficient of friction cannot be maintained due to the thermal fade phenomenon. That is, the dry sintered friction material of the present invention has a friction coefficient of about 0.4 to 0.6, and is a material with a high friction coefficient, and has high resistance to thermal fade phenomenon and water fade phenomenon. , on the other hand, the aggressiveness against the mating material is improved.

Next, an example of the dry sintered friction material of the present invention will be described as rtt#4.

Samples A-C were produced as dry sintered friction materials of the present invention, and samples D-GO were produced as conventional comparative materials. Its component composition (unit weight) is as shown in Table 1.

Page 6, Table 1 Next, we compared the performance of the above A to G.
The following results were obtained.

The evaluations in Table 2 on page 7 are mainly based on friction coefficient, wear rate, opponent #i aggressiveness, and heat fade resistance. All of the products of the present invention, Mu~C, exhibited excellent performance, especially Cat! The effect of O addition was remarkable. On the other hand, the addition of C11 is %AD~
As for G, there was no one that had good attack against the opponent board and good heat resistance.

As for the amount of CaFm added, various tests have revealed that a preferable range is 10- or less.

Anything longer than 10 seconds should be avoided as it generally results in an increase in the amount of wear.

As explained above, the present invention provides a dry friction material that achieves the following effects by adding calcium heptadide to a specific composition of bronze-based dry sintered friction materials. It is.

A dry sintered JII wire material having a 1K high coefficient of friction is provided. In the present invention, a friction coefficient of about α4 to α6 can be obtained, and the heat fade resistance is also excellent. This means that a stable friction surface can be obtained even when sliding at high speeds, making it particularly suitable for automobiles.

Second, a dry sintered friction material with improved aggressiveness against the mating plate is provided; in general, the higher the coefficient of friction, the greater the amount of wear, and the more aggressiveness against the mating plate. will also increase. However, although the present invention has a high friction coefficient, the wear rate is suppressed to 4 hours + t.

This is clear from the fact that when looking at the wear rates in Table 2, M to C of the present invention are located on pages 919 E, IP, and G of the conventional hook. Therefore, the improvement in aggressiveness also leads to a reduction in so-called barking.

Third, a dry sintered friction material is provided which is also improved against the water-7-ade phenomenon. Since the present invention is based on a bronze-based matrix, it is resistant to water fading and is suitable for exposed type two-wheeled vehicles. In this case, the mating plate is stainless steel [11! If used, rust inspection and jlK% will be solved at the same time.

Claims (1)

[Claims] In a dry sintered friction material made of a bronze-based sintered alloy, the sintered alloy has a weight ratio of 60 to 80 -1 copper and 3 to 2 -2 tin.
A dry sintered friction material characterized in that it contains 3 to 20% of alumina and/or silica, 3 to 10% of graphite, 1 to 5% of molybdenum disulfide, and 10 to 10% of calcium heptadide.