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Hybrid fiber reinforced friction material for train braking and preparation method thereof

A technology of hybrid fibers and friction materials, applied in the field of materials, can solve the problems of voids in products, thermal recession of brake pads, hidden dangers, etc., and achieve the effects of reducing the release of volatile substances, improving molding performance, and stable friction performance.

Inactive Publication Date: 2011-09-21
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As we all know, the curing reaction of phenolic resin is a condensation reaction, and a lot of volatile substances will be released during the processing, and voids are prone to appear in the product, and the brake pads are prone to thermal recession and thermal cracks during the braking process, and there are catastrophic hidden dangers

Method used

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  • Hybrid fiber reinforced friction material for train braking and preparation method thereof
  • Hybrid fiber reinforced friction material for train braking and preparation method thereof
  • Hybrid fiber reinforced friction material for train braking and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. Weigh the raw materials, the ratio of weight and number of raw materials is:

[0031] Epoxy modified phenolic resin:

22 copies

Carboxylated nitrile latex:

6 servings

Mixed fibers:

Carbon Fiber (12 parts), Sepiolite Fiber (10 parts), Steel Fiber (15 parts)

Friction modifier:

Graphite (2 parts), clay (3 parts), barium sulfate (10 parts), wollastonite (5 parts), aluminum oxide (2 parts), chromite powder (5 parts), expanded vermiculite (3 parts parts), silicon dioxide (5 parts)

[0032] 2. Preparation of molding material: add the processed material to the composite modified phenolic resin, use a mixer, mix for 20-30 minutes to obtain a powder mixture, and dry at 100°C for 1 hour to obtain a molding material;

[0033] 3. Molding: Put the molding material and metal accessories into the mold, heat and hold the pressure for 2.5min / mm at 155°C and 30MPa, and release the mold while it is hot;

[0034] 4. Post-processing: Af...

Embodiment 2

[0036] 1. Weigh the following raw materials in parts by weight:

[0037] Bismaleamide modified phenolic resin:

20 copies

Neoprene:

5 copies

Mixed fibers:

Carbon fiber (10 parts), aluminum silicate fiber (8 parts), sepiolite fiber (8 parts), steel fiber (12 parts)

Friction modifier:

Mica (3 parts), carbon black (2 parts), calcium oxide (3 parts), aluminum oxide (3 parts), silicon dioxide (8 parts), barium sulfate (10 parts), wollastonite (3 parts ), chromite powder (3 parts), expanded vermiculite (2 parts)

[0038] 2. Preparation of molding material: add the processed material to the modified phenolic resin, use a mixer, mix for 20-30 minutes to obtain a powder mixture, and dry at 95°C for 2 hours to obtain a molding material;

[0039] 3. Molding: Put the molding material and metal accessories into the mold, heat and hold the pressure at 160°C and 30MPa for 2.0 min / mm, and release the mold while it is hot;

[0040] 4. Post-p...

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Abstract

The invention belongs to the technical field of materials, and particularly relates to a hybrid fiber reinforced friction material for train braking and a preparation method thereof. In the invention, a composite modified phenolic resin is used as an adhesive, and hybrid fibers, including carbon fiber, metal fiber, inorganic mineral fiber and the like, are used as the reinforcing fibers. Compared with the prior art, the invention improves the contour machining property of the organic synthetic brake, and the yield of the material is high; the brake has stable frictional property at different braking speeds, does not has obvious degradation of frictional property at high speed, and does not have the phenomena of shedding and cracking on the working surface after the braking test. The friction material provided by the invention can be widely used for manufacturing brake pads, brakes, brake shoes and the like in braking systems of passenger and freight trains, municipal rail transportation, subways and the like.

Description

technical field [0001] The invention belongs to the field of material technology, and in particular relates to a friction material for train braking and a preparation method thereof. Background technique [0002] my country's railways are currently developing in the technical direction of high-speed and fast passenger transportation, and heavy-duty and fast cargo transportation. To ensure the speed of trains, the braking system must have high reliability. [0003] For a long time, the train braking materials used in my country mainly include three categories: phosphorus-containing cast iron materials, powder metallurgy materials and organic synthetic materials. Among them, the friction coefficient of the cast iron material is not affected by the climate and the price is low, but its instantaneous friction coefficient is low and is greatly affected by the initial braking speed, and the performance dispersion during manufacturing is also large. Powder metallurgy materials hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/14F16D69/02
Inventor 丛培红李同生刘旭军吕仁国
Owner FUDAN UNIV
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