Friction material composition, friction material obtained from same, and friction member

A friction material and composition technology, applied in the field of friction material composition and friction material, can solve problems such as insufficiency, achieve the effects of small aggressiveness, high friction coefficient, and inhibiting uneven wear of friction blocks

Active Publication Date: 2012-05-09

HITACHI CHEM CO LTD

13 Cites 28 Cited by

AI-Extracted Technical Summary

Problems solved by technology

However, the effect of improving fading characteristics in the aforementioned high-speed range (veh...

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Method used

As the organic filler contained in the friction material composition of the present invention, for example, cashew nut powder, tire rubber powder, acrylic rubber powder, isoprene rubber, NBR powder, SBR powder, etc. can be enumerated, and they can be Use alone or in combination of two or more. In addition, the content of the aforementioned organic filler is preferably 1 to 20 wt%, more preferably 1 to 10 wt%, in the friction material composition. By setting it within this range, the elastic modulus of the friction material can be increased to prevent deterioration of acoustic vibration performance such as squeeling, and deterioration of heat resistance and reduction in strength due to thermal history can be avoided.

[0073] By containing refractory fiber as the aforementioned fiber base material, the coefficient of friction during high-speed decay is further improved. The refractory fibers mentioned here are precursor fibers of PAN (polyacrylonitrile, polyacrylonitrile) carbon fibers, which are obtained by heat-treating PAN fibers at 200 to 350° C. in the air.

[0077] Furthermore, the binder is contained preferably in an amount of 5 to 20 wt%, and more preferably in an amount of 5 to 10 wt%, in the entire composition. In this range, the strength of the friction material can be prevented from being lowered, and the porosity of the friction material can be reduced to increase the modulus o...

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Abstract

Provided is a friction material composition, comprising a binder, fibrous base materials, an abrasive material, an inorganic filler, and an organic filler. The composition further contains a specific amount of zinc. The fibrous base materials include a specific amount of at least one fibrous base material selected from cellulose fibers and fire-resistant fibers and a specific amount of iron-based fibers as another fibrous base material. The composition contains 1 wt.% or less inorganic abrasive material having a Mohs hardness of 8 or higher and a particle diameter of 1 [mu]m or larger as the abrasive material. This friction material composition gives a brake pad for passenger cars which less attacks mating materials than conventional products, has a high coefficient of friction during braking when repeatedly used for braking in high-speed traveling, and can be inhibited from wearing or unevenly wearing. Also provided are a friction material and a friction member both obtained from the composition.

Application Domain

Other chemical processesDomestic articles +3

Technology Topic

Polymer chemistryZinc +6

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Examples

Experimental program(1)

Example Embodiment

[0107] Example

[0108] The friction material composition of the present invention is further explained using examples.

[0109] (Production of disc brake friction block)

[0110] The materials were blended at the blending ratios shown in Tables 1 to 5 to obtain friction material compositions of Examples 1 to 20 and Comparative Examples 1 to 4.

[0111] In addition, the method of covering cashew nut powder with IR rubber is as follows. First, using a pressure kneader (manufactured by Moriyama Co., Ltd.), 100 parts by mass of cashew nut powder and 10 parts by mass of liquid IR rubber were pressure-kneaded for 3 minutes under a pressure of 0.49 MPa.

[0112] The friction material composition was mixed using a Lodige mixer (manufactured by Matsubo Co., Ltd., trade name: Lodige Mixer M20), the mixture was preformed using a molding press (manufactured by Oji Machinery Co., Ltd.), and a molding press ( (Manufactured by Sanki Seiko Co., Ltd.) The obtained preform was subjected to hot press molding at a molding temperature of 145°C and a molding pressure of 30 MPa for 5 minutes, and the resulting molded article was heat-treated at 200°C for 4.5 hours, and It was ground using a rotary grinder and subjected to a coking treatment at 500° C. to obtain disc brake friction pads of Examples 1 to 20 and Comparative Examples 1 to 4.

[0113] In addition, in the examples and comparative examples, the projected area of the friction material is 52 cm 2 Disc brake friction block.

[0114] (Evaluation of cashew nut powder shedding)

[0115] The friction material compositions of Examples 1 to 20 and Comparative Examples 1 to 4 obtained by the aforementioned method were put into a polyethylene bag, vibrated 10 times, and the mass of the cashew nut powder falling off the lower part of the bag was measured. This is evaluated. The evaluation criteria are as follows.

[0116] A: The amount of shedding is 1 wt% or less of the blended amount of cashew powder.

[0117] B: The amount of shedding is 3 wt% or more of the blended amount of cashew nut powder.

[0118] (Evaluation of thermal degradation characteristics)

[0119] The disc brake friction blocks of Examples 1 to 20 and Comparative Examples 1 to 4 manufactured by the aforementioned method were used, and the thermal decay characteristics were evaluated using a brake dynamic tester. The experiment used a conventional pin-slide type colette type caliper and a ventilated disc rotor (FC190) manufactured by Kiriu Co., Ltd., and evaluated the moment of inertia of the skyline V35 manufactured by Nissan Motor Co., Ltd.

[0120] The effectiveness test according to SAE J2522 was carried out, and the minimum value of the friction coefficient generated in 15 times of braking in FADE1SECTION was evaluated.

[0121] (Evaluation of high-speed decay characteristics)

[0122] Using the disc brake friction pads of Examples 1 to 20 and Comparative Examples 1 to 4 produced by the aforementioned method, and using a brake dynamic tester, the evaluation of high-speed degradation characteristics was performed. The experiment used a conventional pin-slide type colette type caliper and a ventilated disc rotor (FC190) manufactured by Kiriu Co., Ltd., and evaluated the moment of inertia of the skyline V35 manufactured by Nissan Motor Co., Ltd.

[0123] Carry out the counter friction based on JASO C427 (initial speed is 50km/h, final speed is 0km/h, deceleration is 0.3G, the brake temperature before braking is 100℃, the number of braking is 200 times), and then the high-speed degradation test (The initial speed is 200km/h, the final speed is 0km/h, the deceleration is 0.8G, the brake temperature before the first braking is 100℃, and 15 braking is performed at 60 second intervals), and the high-speed degradation is measured The minimum value of the friction coefficient, the amount of friction block wear, and the uneven amount of friction block wear in the sliding direction in the test.

[0124] (Evaluation of rotor wear)

[0125] Cut out a 25mm×25mm×8mm test piece from the friction material surface of the disc brake friction block made of the friction material composition of Examples 1-20 and Comparative Examples 1-4, and press it with a pressure of 73.5kPa After being dragged on a disk rotor rotating at a peripheral speed equivalent to 130 km/h for 22 hours, the amount of rotor wear was measured. As the disc rotor, a ventilated disc rotor (FC190) manufactured by Kiriu Co., Ltd. was used.

[0126] The results are shown in Tables 1 to 5.

[0127] [Table 1]

[0128]

[0129] [Table 2]

[0130]

[0131] [table 3]

[0132]

[0133] [Table 4]

[0134]

[0135] [table 5]

[0136]

[0137] Compared with Comparative Example 4, which is an LS material, Examples 1 to 20 show the same high-speed degradation characteristics, and it can be seen that rotor wear is significantly smaller. In addition, by comparison with Comparative Examples 2 and 3, which are conventional NAO materials, it can be seen that Examples 1 to 20 show remarkably high high-speed degradation characteristics and show equivalent rotor wear.

[0138] In addition, from the comparison of Examples 1 to 3 and Comparative Example 1, it can be seen that the combination of a small amount of iron-based fibers and zinc has a significant effect in improving the high-speed decay characteristics.

[0139] From the comparison between Example 11 and Comparative Example 1, it can be seen that the combination of a small amount of iron-based fibers and cellulose fibers has a significant effect in improving the high-speed decay characteristics.

[0140] From the comparison between Example 16 and Comparative Example 1, it can be seen that the combination of a small amount of iron-based fibers and refractory fibers has a significant effect in improving the high-speed decay characteristics.

[0141] From Examples 7 to 10, 13 to 15, and 18 to 20, it can be seen that coating cashew nut powder with liquid rubber has an effect of suppressing the fall of cashew nut powder.

[0142] From Examples 8-10, 14, 15, 19, and 20, it can be seen that the combination of γ-alumina and PTFE powder is effective in improving the thermal decay characteristics.

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Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Reduce aggression
Increase coefficient of friction

Simple, convenient and practical multifunctional mouse fixing device

PendingCN111134890ALimit non-interventional activitiesReduce aggressionAnimal fetteringStructural engineeringMechanical engineering

Owner:广西中医药大学第一附属医院

Friction material composition, friction material obtained from same, and friction member

A friction material and composition technology, applied in the field of friction material composition and friction material, can solve problems such as insufficiency, achieve the effects of small aggressiveness, high friction coefficient, and inhibiting uneven wear of friction blocks

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Image

Examples

Example Embodiment

PUM

Description & Claims & Application Information

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