JPH06122867A - Wear-resistant abrasive material - Google Patents

Abstract

PURPOSE:To inexpensively obtain the abrasive material used for the brakes of automobiles, sufficiently resisting to high loads on the various races of the automobiles, etc., excellent in durability and wear resistance, and good in thermal stability. CONSTITUTION:This semi-metallic abrasive material containing as a binder a thermosetting resin containing steel fibers as a substrate and excellent in abrasion resistance is characterized by containing one kind or more of metals selected from chromium, cobalt, nickel, tin, titanium and manganese as an abrasive wear controlling agent in an amount of 0.5-30wt.% based on the steel fibers.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction material having excellent wear resistance, which can be used as a high load friction material for racing cars.

[0002]

2. Description of the Related Art As automobiles become faster and more sophisticated, the level of performance required for brakes also rises, and
The carcinogenicity of asbestos has also become clear, and it is difficult to deal with the conventional friction material made of a composite material based on asbestos. Furthermore, in a racing car, etc., the braking load is high, so the temperature of the friction material is only 700-800.
The temperature rises above ℃, and after a few braking operations, the conventional asbestos-based friction material is worn out and becomes useless at all.
As such a high load friction material, there is a C / C composite material for racing cars such as Formula 1, but it is extremely expensive and the coefficient of friction at low temperature is extremely low, so temperature maintenance is required. There are drawbacks such as

On the other hand, like the asbestos-based friction material, a phenolic thermosetting resin such as a phenolic resin or a phenol-modified resin is used as a binder, but steel fiber is used as the base material. In addition, a semi-metallic friction material made by adding an inorganic or metallic friction and wear modifier is significantly superior to asbestos-based friction materials in thermal stability and wear resistance, There is. However, under the severe conditions of use such as in various car races, the durability and wear resistance are not always satisfactory.

[0004]

An object of the present invention is to provide a friction material for automobile brakes, which can withstand a high load such as in various races, has excellent durability and wear resistance, and has good thermal stability, at low cost. That is the purpose.

[0005]

The gist of the present invention is a semi-metallic friction material containing a steel fiber as a base material and a thermosetting resin as a binder, which is selected from chrome, cobalt, nickel, tin, titanium and manganese. A friction material having excellent wear resistance is characterized by containing one or more metals as a friction and wear modifier in an amount of 0.5 to 30 wt% of the weight of the steel fiber. The details will be described below.

The friction material of the present application contains steel fiber as a base material (reinforcing material) in an amount of 20 to 65% by weight of the total weight of the friction material.
As a binder, it contains 7 to 15% of a thermosetting resin.
As the thermosetting resin, various modified phenolic resins or various imide thermosetting resins are used. Besides this,
As the friction and wear modifier, various substances are mixed according to the specifications required for the friction material.
Examples of these friction and wear modifiers include organic fillers such as rubber and cashew dust, inorganic fillers such as barium sulfate and calcium carbonate, solid lubricants such as graphite and molybdenum disulfide, and alumina. An abrasive such as chromium oxide or quartz can be used.

The characteristic feature of the friction material of the present invention is that, in such a structure, chrome, cobalt, and
One or more metals selected from nickel, tin, titanium and manganese are mixed in the form of powder or fibers in an amount of about 0.5 to 15% of the weight of steel fibers as a base material. A conventional resin mold type friction body (disk pad, brake lining) using a mixture of such composition
A friction body is manufactured by the same method as the manufacturing method of.

The friction body made of the friction material of the present invention is
When used in a high load state, fibrous iron and metals such as chrome, cobalt, nickel, tin, titanium and manganese form a heat resistant alloy at a high temperature of 800 to 1000 ° C. to obtain oxidation resistance. This alloy layer remarkably forms on the contact surface with the mating material, and therefore has the effect of significantly improving the wear resistance of the friction surface. In the above, if the blending amount of various metal powders is 0.5% or less, the effect is practically difficult to be recognized, and if the blending amount is 30% or more, the desired effect is remarkably reduced and the blending ratio becomes higher. If
It becomes difficult to form the alloy layer itself.

If necessary, one or more kinds of inorganic fibers such as rock wool, calcium metasilicate fiber and ceramic fiber are added to the friction material having the above composition in an amount of about 0.5 to 10% by weight of the friction material. As a result, the brake feeling characteristics can be remarkably improved, and a brake with excellent usability can be obtained with almost no change in the friction coefficient and the wear amount.

[0010]

[Examples] To a brake material having a composition as shown in Table 1, the metal powder of Table 2 was added to prepare a disk pad based on a conventional dry manufacturing method, and abrasion resistance was tested with a single brake dynamometer. did. In the measurement, the pressing force of the inertia and the pad was kept constant, and the rotation speed of the rotor, that is, the vehicle speed was changed from 200 km / hr to a low speed of 50 km.
The braking operation for dropping to / hr was performed 50 times at the same rotor temperature, the wear amount was measured, and the average value of the measured values was calculated. All percentages mean weight percentages based on the total weight of the friction material.

[0011]

[Table 1] ------------------ Modified phenolic resin 10% Steel fiber 60% Lubricant, filling Amount to make the whole agent 100% ------------------------------------------

[0012]

[Table 2] ----------------------------------------- Amount of metal powder blended (%) Brake temperature before braking (° C) Abrasion amount (mm) Cr ... 2, Mn ... 1 350 0.190 Cr ... 4, Mn ... 1 350 0.149 Cr ... 6, Mn ... 3 350 0.075 Cr ... 6, Mn ... 6 3500 .065 Cr ... 3 350 0.191 Mn ... 3 350 0.195 Ni ... 2, Co ... 1 350 0.025 Ni ... 4, Co ... 1 350 0.019 Ni ... 8, Co ... 6 350 0.056 Ni 3350 0.020 Co ... 3 350 0.028 Sn ... 5 350 0.060 Ti ... 4 350 0.058 Control Cu ... 3 350 0.364 Al ... 3, Cu ... 3 350 0.380 ----- −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−

As is clear from the above results, the friction material of the present invention has much higher wear resistance than conventional friction materials.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroyoshi Kobayashi 1091 Nagatoro, Saku City, Nagano Prefecture MK Kashiyama Co., Ltd.

Claims (5)

[Claims] 1. A semi-metallic friction material containing a steel fiber as a base material and a thermosetting resin as a binder,
One or more metals selected from chrome, cobalt, nickel, tin, titanium and manganese are used as friction and wear modifiers.
A friction material having excellent wear resistance, comprising 0.5 to 30% by weight of the weight of the steel fiber. 2. A semi-metallic friction material containing a steel fiber as a base material and a thermosetting resin as a binder,
A friction material having excellent wear resistance, comprising one or more metals selected from chrome, cobalt, nickel and manganese as a friction and wear modifier in an amount of 0.5 to 30% by weight based on the weight of the steel fiber. 3. A semi-metallic friction material containing a steel fiber as a base material and a phenol-based and / or polyimide-based thermosetting resin as a binder, wherein cobalt and / or
Alternatively, a friction material having excellent wear resistance, characterized by containing nickel as a friction and wear modifier in an amount of 0.5 to 30 wt% of the weight of the steel fiber. 4. A semi-metallic friction material comprising a steel fiber as a base material and a phenolic thermosetting resin as a binder, wherein chrome and / or manganese are used as a friction and wear modifier to increase the weight of the steel fiber. 0.5-
A friction material having excellent wear resistance, which is characterized by containing 30% by weight. 5. Steel fiber is 20 to 6 of the total weight of the friction material.
The friction material excellent in wear resistance according to any one of claims 1 to 4, which is contained in an amount of 5% by weight.