JPS5974179A - Friction material - Google Patents

Abstract

PURPOSE:To provide a friction material consisting of fiber, binder, copper- lead alloy in powder or granules, and filler, which has a consistent friction coefficient and minimized wear at a high temperature and does not cause cracking of drum or rotor. CONSTITUTION:At least one fiber (A) selected from among heat-resistant organic fiber (e.g. phenolic fiber), inorganic fiber (e.g. carbon fiber) and metal fiber (e.g. stainless steel fiber) or its blend with asbestos or steel fiber, (B) binder (e.g. melamine resin), (C) 5-70vol.% copper-lead alloy in powder or granules with a particle diameter of 10mesh or smaller and a copper content of about 70% and (D) 5-60vol.% filler with a Mohs' hardness of 4.5 or lower (e.g. graphite) and/or 0.1-20vol.% filler with a Mohs' hardness of 4.5 or higher (e.g. alumina) are mixed homogeneously. The mixture is molded under heat and pressure, followed by after-curing.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a grinding material entirely containing a granular copper-lead alloy.

Conventionally, friction materials used in the brakes of vehicles such as automobiles and industrial machinery include those made entirely of asbestos fibers,
Depending on the field of use, asbestos may harm the environment, so semi-metallic masonry materials made of metal fibers such as steel fibers are often used, but there are problems that need to be solved with these conventional products. There were many.

That is, both the metallic friction materials containing asbestos as a fiber component and the metallic friction materials listed in IIJ are composed of a fiber component, a binder such as a phenol resin, and a filler such as graphite-barium GIL. Friction on the friction surface Heat causes deterioration of the organic components in the composition, resulting in increased wear at high temperatures.In addition, the friction heat not only damages the friction material itself, but also causes heat to the drum and rotor. This is because it has been found that cracks occur, and conventional friction materials also gradually deform when they come into contact with drums, rotors, etc. and exhibit frictional braking force. It has also been pointed out that the coefficient of friction of the semi-metallic friction materials is not constant.

The present invention has been made in view of the above-mentioned drawbacks of the prior art, and is characterized in that it is composed of fibers, a binder, a powdery copper-lead alloy, and one or more fillers. be.

That is, as a result of repeated research in order to solve the above-mentioned problems of conventional friction materials, the inventors of the present invention created a friction material by adding powdered copper-lead alloy to fibers, binders, and fillers, and found that the control In terms of power, the friction coefficient is more stable than conventional products, and in terms of wear rate, there is less wear at high temperatures compared to conventional products, and furthermore, there is no thermal cracking of the drum or rotor. This completes the present invention.

The fibers used in the present invention can be asbestos or steel fibers, and if asbestos is used, the friction material of the present invention can be asbestos-based or potassium-based as in the conventional friction material, and if steel fiber is used, it can be semi-metallic. Becomes the property of In addition, the fibers of the present invention include phenol delicate, heat-resistant organic fibers such as aromatic polyamide fibers, P carbon fibers, glass fibers-silicade fibers, potassium titanate fibers, rock wool fibers, and metal fibers such as stainless steel fibers and brass fibers. It may be one of the above-mentioned types, or it may be one of two types selected from the aforementioned various heat-resistant organic fibers, metal fibers, asbestos, and steel fibers.

In addition, as the filler used in the present invention, those used in conventionally known asbestos-based or semi-metallic friction materials can be used in the same way, but the blend M may be changed depending on the difference in 7-th hardness. Power yields good results. That is, fillers with a Mohs hardness of 45 or less include those with lubricating properties such as graphite, molybdenum disulfide, teflon, aromatic polyester, and cashew paste, as well as sulfuric acid, SIJium, and cal/rum carbonate. It is preferable to mix such fillers with a volume coefficient of 5 to 60, and fillers with a Mohs hardness of 4.5 or higher, such as quartz-zircon sand and alumina, should be blended with a volume coefficient of 01 to 20. It is preferable. It should be noted that these fillers, which are classified according to Mohs' hardness, can be used either singly or in combination.

On the other hand, the bonding material used in the present invention can also be made of conventionally used materials, including thermosetting resins such as phenolic resin, melamine resin, urea resin, and polyurethane resin. These include synthetic resins, taloloprene rubber, nitrile rubber, butadiene rubber, and other synthetic rubbers, as well as natural rubber.

The present invention adds a copper-lead alloy to each of the above compositional components,
The copper-lead alloy is made of, for example, 70 cycles of copper and 30 cycles of lead,
It is an alloy that has a soft alloy component (lead) in a hard material (copper), and is characterized by TFJ4 abrasion resistance, thermal expansion of 71 degrees, and high thermal conductivity. In the present invention, it is used in the form of powder and granules, and the particle size at that time is, for example, 10 mesh or less, and the amount of liquid added is 5 to 70.
Performance percentage.

The copper-lead alloy has been conventionally known as a bearing base metal, but it is not known that it can be added to a friction material in the form of powder or granules.

The method for producing the friction material of the present invention includes, for example, uniformly mixing the fibers, binder, filler, and powdered copper-lead alloy, followed by heating and pressure molding at an appropriate temperature and pressure. The friction material of the present invention obtained in this way has fibers and granular copper-lead alloy dispersed uniformly in the integrated binder and filler.] 7. It has excellent frictional force. Of course, when we conducted wear tests with known friction materials, we found that the wear rate was low, especially at high temperatures, and there was no thermal cracking on the drum or rotor that was frequently observed with conventional products. In addition, the coefficient of friction that determines braking force is stabilized, and the friction coefficient of conventional friction is 1! We were able to completely resolve the problems that existed in A1O. This is thought to be due to the wear resistance, thermal conductivity, and other properties of the powdery copper-lead alloy.

Next, embodiments of the present invention will be described.

Example 1 Asbestos (fiber) 60% by volume 1
Copper-lead alloy (copper-lead alloy) of 0 Metsuyu 1 female 20 N 11 barium oxide (filling material) 10 Cashew dust (filling material) 10 l Phenolic resin (binding material) 20 N in a mixer After uniformly mixing, the mixture was pressed at a temperature of 150° C. and a pressure of 200 kg/ctl for 10 minutes, and then after-cured at aiH & 175° C. for 5 hours to obtain an example of the vibration material of the present invention.

Example Steel fiber (# & fiber) 60% by volume Copper-lead alloy (copper-lead alloy) of 10 mesos or less 20 Diminated barium (filler) 10 Cashew dust (filler) 10 l Phenolic resin (binder) Another example of the friction material of the present invention was obtained by treating the component 201 in the same manner as in Example 1.

As mentioned above, the friction materials shown in the above two examples exhibited extremely superior fce friction performance compared to known friction materials.

Agent Yoshikuni Koizumi 583

Claims (1)

[Scope of Claims] A friction material characterized by comprising one fiber, a binder, a granular copper-lead alloy, and one or more fillers. 2 Stones as fibers! 8. The friction material according to claim 1, characterized in that a friction material of 8 is used. The friction material according to claim 1, characterized in that steel fibers are used as the 3#a fibers. 4 types of fibers selected from heat-reducing organic fibers such as phenol fibers and aromatic polyamide fibers, or metal fibers such as carbon fibers, glass fibers, silicate fibers, potassium titanate fibers, rock wool fibers, steel fibers, and brass fibers. 1ff) 1b 5. 5 to 70 granular copper-lead alloys; (b) The friction material according to any one of claims 1 to 4, characterized in that 5% is used. 6. 5 to 60% filler with a Mohs hardness of 4.5 or less
Claims 1 to 5 characterized in that
Friction material described in section. The friction material according to claims 1 to 6, characterized in that a filler having a Z-Mohs hardness of 4.5 or more is used in an amount of 0.1 to 20%.