Friction material comprising graphite, methods of making friction materials, and their uses

A friction material, graphite technology, applied in the direction of graphite, friction lining, friction clutch, etc.

Active Publication Date: 2021-08-06
IMERTECH SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007]The present invention as defined in the appended claims solves the problems discussed above

Method used

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  • Friction material comprising graphite, methods of making friction materials, and their uses
  • Friction material comprising graphite, methods of making friction materials, and their uses

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] Example 1: Hydrophobic CVD coated synthetic graphite using a rotary furnace

[0101] The particle size distribution is D 10 = 5μm and D 90 Ground synthetic graphite "GRAPHITE SGA" = 73 μm was used as starting material to improve its resilience and other properties for use as graphite-containing friction material. The starting material was fed in a continuous manner using a single screw into a rotary kiln reactor heated to 1050°C for two hours and approximately 2000 g of material was produced. A mixture of hydrocarbon and inert gas (amorphous carbon precursor: C 3 h 8 (3L / min) and carrier gas: N 2(1 L / min)) for chemical vapor deposition (CVD) to maintain the pressure in the reactor at 0 to 8 mbar above atmospheric pressure. The inclination of the tube was set at 4°, the rotation speed was set at 6 rpm, and the residence time in the kiln was about 30 minutes. To eliminate any amount of polycyclic aromatic hydrocarbons (PAHs), inert atmosphere (N 2 ) for further pro...

Embodiment 2

[0106] Example 2: Hydrophilic CVD-coated natural graphite using a rotary furnace and additional heat treatment

[0107] The particle size distribution is D 10 = 6μm and D 90 = 42 μm flake natural graphite "GRAPHITE NGB" was used as a starting material for a hydrophilic graphite friction material based on treated natural graphite with high resilience. The starting material was fed continuously for two hours using a rotary kiln reactor externally heated to 1050 °C and produced approximately 700 g of material. A mixture of hydrocarbon and inert gas (amorphous carbon precursor: C 3 h 8 (3L / min) and carrier gas: N 2 (1 L / min)) for chemical vapor deposition (CVD) to maintain the pressure in the reactor at 0 to 8 mbar above atmospheric pressure. The inclination of the tube was set at 4°, the rotation speed was set at 6 rpm, and the residence time in the kiln was about 30 minutes.

[0108] In order to improve the wettability of the obtained CVD modified "GRAPHITE NGB", another p...

Embodiment 3

[0112] Example 3: CVD Treated Synthetic Graphite Using a Fluidized Bed

[0113] The particle size distribution is D 10 = 7μm and D 90 Potato-shaped synthetic graphite "GRAPHITE PSG" = 36 μm was used as the starting material for the fluidized bed batch process. The starting material (8500 g) was loaded into a fluidized bed reactor, which was then heated to 920°C under nitrogen atmosphere. Using a mixture of hydrocarbon and inert gas (amorphous carbon precursor: toluene C 7 h 8 and carrier gas: N 2 ) was subjected to CVD treatment for 260 minutes. Then, the reactor and the treated graphite were cooled under nitrogen atmosphere. When the material reaches ambient temperature, it is discharged from the fluidized bed.

[0114] The properties of the untreated starting material "GRAPHITE PSG" and the obtained high resilience material "GRAPHITE PSG HSBC" are listed in Table 3:

[0115] table 3

[0116] graphite PSG (for comparison) PSG HSB C (Invention) Type...

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Abstract

The present invention relates to friction materials comprising graphite having a c / 2 of 0.3358 nm or less and a spring - back of 40% or more, such as 41% or more. The invention further relates to methods of making and uses of such friction materials.

Description

technical field [0001] The present invention relates to friction materials comprising resilient graphite material. The invention also relates to a method of manufacturing such a friction material and its use. Background technique [0002] Friction materials are used in various applications, for example in disc brakes, drum brakes or clutches, and ultimately in vehicles such as automobiles, heavy duty vehicles, wind turbines and railways, among others. Depending on its intended use, friction materials should meet various requirements. Some of the desired properties include good heat dissipation through high thermal conductivity, well-defined and stable coefficient of friction, good lubrication, high compressibility, vibration damping properties, noise reduction and low disc brake drag. [0003] The use of asbestos in friction materials has been phased out over the past few decades for obvious reasons of workplace safety, health and environmental concerns. Furthermore, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/46C09C1/56C08K3/22C08K7/06F16D69/00C01B32/20F16D13/60F16D69/02
CPCC01B32/20C01P2002/78C01P2004/61C01P2006/12C01P2006/80F16D13/60F16D69/00F16D69/02F16D2200/0052C09C1/46C09C1/56C09K3/14C01B32/30C01B32/21C01P2002/60C01P2006/32C01P2006/90C09C3/063F16D69/026F16D2200/0065F16D2200/0082
Inventor R·吉拉尔迪M·古拉斯M·斯帕尔
Owner IMERTECH SAS
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