JPS5974180A - Friction material - Google Patents

Abstract

PURPOSE:To provide a friction material consisting of fiber, binder, flaky iron powder and filler and having excellent wear resistance. 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. phenolic resin), (C) 2-60vol.% flaky iron powder and (D) 3-35vol.% 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 is suitable for use in vehicles such as automobiles and industrial machines AI&'4, and has superior wear resistance than those using iron powder such as ordinary reduced iron powder or atomized iron powder. This is related to festival materials.

Conventionally, the friction materials used in Fregis such as up-bound vehicles and industrial machinery are those that have asbestos as a fiber component, and depending on the field of use for boxes, asbestos may harm environmental hygiene.
49. Metal fibers such as steel fibers. Semi-metallic friction materials containing KiE components are often used.

Therefore, this type of friction material is molded into a friction pad that is always removable, and it wears out little by little when it exerts frictional force on the friction surface, so if the amount of friction exceeds a certain range, it should be replaced with a new one. Since it is a consumable item that is used in various situations such as replacing friction materials, improving the wear resistance of the friction material not only improves the reliability of the friction material itself, but also improves the reliability of the friction material itself (see above).
It is clear that the exchange period of the depleted pad JtlJ can be extended for a long period of time, leading to a reduction in the running costs of industrial machinery and the like.

The present invention is based on the above-mentioned circumstances, and has been developed to provide four
All JD materials are made for the purpose of providing all / 2 items,
The composition of item 7 is characterized by consisting of fibers, a binder such as phenol, iron powder, and one or more fillers.

That is, the inventor of the present invention focused on iron powder, which has been used as a filler in the past, and conducted extensive research on the relationship between these and wear resistance using various iron powders. When scaly iron powder is used as the material, a friction material with P8A wear resistance of 1 can be obtained compared to when other iron powders such as l″4′ are used or sprayed iron powder is used. The present invention was completed based on this knowledge.

Next, the details of the friction material of the present invention! iS1. I will clarify.

The fibers used in the present invention can be asbestos or steel fibers; if asbestos is used, the void material (in the present invention) will be asbestos-based as in conventional materials, and if steel fibers are used, it will be semi-metallic. Become. In addition, the fibers of the present invention include heat-resistant organic fibers such as phenolic fibers, aromatic polyamide +'41 modified fibers, carbon fibers, Ie, glass stocks, silicate fibers, potassium titanate fibers, rock wool fibers,
Metals such as stainless steel fibers and brass fibers, one yuzu made from precepts It may be more than yuzu.

In addition, as the filler used in the present invention, those used in conventionally known asbestos-based or semi-metallic yarn-wrapped materials can be used in the same way, but fillers with different blending amounts depending on the difference in Mohs' hardness may be used. Good r11!1-The result is good. That is, fillers with a Mohs hardness of 45 or less include graphite, molybdenum disulfide, Teflon, polyester polyester, and moisturizers such as cashew dust. There are materials that have an IT effect, barium sulfate, calcium carbonate, etc., but it is preferable to mix these materials in a volume ratio of 5 to 65. Outside this range, V, J, and wear and tear occur. Only friction materials with inferior properties can be obtained. Among the fillers having a Mohs hardness of 45 or less, graphite is particularly effective in increasing wear resistance, but in this case, the preferable amount to be used increases to 5 to 50 vol.

In addition, fillers with a Mohs hardness of 45 or higher include quartz, zircon sand, alumina, etc., but wear resistance can be improved even when such fillers are blended, and in this case, the preferred amount used is 01. By appropriately selecting and blending 1 filler material with a volume factor of 1 to 20 and classified according to the Mohs hardness described above, it is possible to obtain friction resistance with an increase in wear resistance, but if no filler is used at all, It has been found that if it is not used, a friction material with the desired friction performance cannot be obtained.

The binding materials used in the present invention can be the same as those conventionally used, and include thermosetting resins such as phenol resin, melamine resin, urea 4I7J resin 1,1 jellyimide resin, etc. Synthetic rubbers such as chloroprene rubber, nitrile rubber, butadiene rubber, and natural rubbers include soil.

In the present invention, scaly iron powder is added to each of the above composition components as another filler, and the composition of the scaly iron powder can be freely selected from that of ordinary mild steel to that of high carbon steel. The preferred amount is 2 to 60% by volume. In addition, if iron powder other than J scale-like iron powder is used, only a product with inferior wear resistance can be obtained.
IHq + Ria 7.

As a method for manufacturing the friction material of the present invention, for example, after uniformly mixing the fibers, bonded fibers, packed layer, and scaly iron powder, heating and pressure molding is performed at an appropriate temperature and pressure, and further, as appropriate. It is enough to apply afterguard f at the temperature, and in this way
According to the present invention;',:' When the J-sensitive material sheet fibers, the binder warp, and the filler are integrated, it becomes I/(1 because it contains scaly iron powder) t, -jl. : Not only does it exhibit JJ power, but it also shows excellent wear resistance in comparison tests with conventionally used frictions containing other types of iron powder such as reduced iron and spray iron. This is thought to be due to the characteristics of the blended scaly iron powder.

Next, embodiments of the present invention will be described.

Example steel fiber (fiber) 30% by volume
Phenol resin (binding material) 2o
〃Scaly iron powder (scaly iron powder) 2o 〃
Black Yu1) (filler with Mohs hardness of 45 or less) 2
0 Reflex sand (filler with a Mohs hardness of 15 or more) 2 After uniformly mixing 87 (barium schife oxide (filler with a Mohs hardness of 45 or more) with a mixer, the temperature is 1
It was pressed for 10 minutes at 50°C and a pressure of 20Q k4/c, nl, and then after-cured for 5 hours at 175°C and A degree to obtain the friction material 1 of the present invention.

EXAMPLES In the composition of Example 1, asbestos was used instead of steel fibers, and the other compositions and manufacturing methods were the same to obtain friction material 2 of the present invention.

Wear resistance test of friction material of the present invention In the compositions of Examples 1 and 2, sprayed iron powder was used instead of scaly iron powder, and the other compositions and manufacturing methods were the same, respectively, and Comparative Example Friction Material 1.2' When all wear tests were conducted between the Example and the Comparative Example, it was found that the wear amount of the Example Friction Materials 1 and 2 was reduced by 60% compared to the Comparative Example Friction Materials 1 and 2. .

In other words, the effectiveness of the friction material of the present invention was confirmed. Agent Ko Urine Yoshikuni

Claims (1)

[Claims] 1u1. A friction material characterized by comprising fiber, a binder such as phenolic resin or rubber, scaly iron powder, and one or more fillers. 2. The friction material according to claim 1, characterized in that asbestos is used as the fiber. 3. The friction material according to claim 1, characterized in that steel fibers are used as the fibers. 4 The fibers were selected from heat-resistant organic fibers such as phenol fibers and aromatic polyamide fibers, carbon fibers, glass fibers, metal fibers such as Licade fibers, potassium titanate fibers, rock wool IR fibers, Sderus fibers, and brass fibers. The friction material according to claim 1, characterized in that it uses yuzu fibers or two or more types of fibers selected from the group containing these fibers, asbestos, and steel fibers. 5I! #The friction material according to any one of claims 1 to 4, wherein the amount of flaky iron powder is in the range of 2 to 60% by volume. 6. As a filler, use Mohs hardness of 4.5 or higher to 0.1
6. The friction material according to claim 1, wherein the friction material is used in a volumetric range of 20 to 20. Z. The friction material according to any one of claims 1 to 6, characterized in that graphite is used as the filler in a volumetric range of 5 to 50. 8. The friction material according to any one of claims 1 to 7, characterized in that a material other than graphite with a Mohs hardness of 45 or less and a volume coefficient of 5 to 35 is used as a filler.