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Preparation method of graphite for friction material

A friction material and graphite technology, applied in the field of graphite preparation of friction materials, can solve the problems of small fluctuation of wear rate and increase of wear rate, and achieve the effect of excellent wear amount and improved utilization.

Pending Publication Date: 2022-03-22
唐山金湾特碳石墨有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The increase of load and sliding speed will increase the temperature of the friction pair interface, but at this time the temperature will not be very high, the friction coefficient will decrease slowly first, and the wear rate will fluctuate less; when there is an external heat source, if the temperature is high, the high At 500°C, the interface temperature of the friction pair is high, and even if the friction coefficient increases slightly, the fluctuation is very gentle, but the wear rate will increase significantly

Method used

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  • Preparation method of graphite for friction material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] S1. Physical desulfurization

[0042] After the lignite is crushed and screened with 10 meshes, it is desulfurized by jigging, that is, jigging is carried out by re-vibrating jigs in the air chamber on the side of the screen.

[0043] S2, chemical desulfurization

[0044] Soak the raw coal treated in step S1 in a 1mol / L sodium hydroxide solution, irradiate it with 400W microwave for 1min, and the total soaking time is 20min; after soaking, filter;

[0045] S3, drying, crushing

[0046] Dried at 100°C until the moisture content is as low as 4%, crushed through a 100-mesh sieve;

[0047] S4, graphitization treatment

[0048] Under the protection of inert gas, the temperature was raised to 1800°C, kept for 240 hours, and graphitized;

[0049] S5, activation

[0050] Activated by carbon dioxide gas, the activation temperature is 500°C, and the reaction time is 6h;

[0051]S6, intercalation oxidation

[0052] Mix the activated graphite with pyridinium chromate and oxa...

Embodiment 2

[0054] S1. Physical desulfurization

[0055] After the bituminous coal is crushed and screened with 10 meshes, it is desulfurized by jigging, that is, jigging is carried out by re-vibration jigs in the air chamber on the side of the screen.

[0056] S2, chemical desulfurization

[0057] Soak the raw coal treated in step S1 in 1mol / L sodium hydroxide solution, and irradiate it with 500W microwave for 1.8min, the total soaking time is 21min; after soaking, filter;

[0058] S3, drying, crushing

[0059] Dried at 120°C until the moisture content is as low as 0.5%, crushed through a 100-mesh sieve;

[0060] S4, graphitization treatment

[0061] Under the protection of inert gas, the temperature was raised to 1800°C, kept for 350 hours, and graphitized;

[0062] S5, activation

[0063] Activated by carbon dioxide gas, the activation temperature is 500-600°C, and the reaction time is 6-8h;

[0064] S6, intercalation oxidation

[0065] Mix the activated graphite with pyridinium...

Embodiment 3

[0067] S1. Physical desulfurization

[0068] The sub-bituminous coal is crushed, screened with 15 mesh, and desulfurized by jig, that is, jigged by re-vibration jig in the air chamber on the side of the screen.

[0069] S2, chemical desulfurization

[0070] Soak the raw coal treated in step S1 in a 1.5mol / L sodium hydroxide solution, and irradiate it with 450W microwave for 1.5min, the total soaking time is 25min; after soaking, filter;

[0071] S3, drying, crushing

[0072] Dry at 130°C until the moisture content is as low as 1.0%, and crush through a 100-mesh sieve;

[0073] S4, graphitization treatment

[0074] Under the protection of inert gas, the temperature was raised to 1900°C, kept for 300 hours, and graphitized;

[0075] S5, activation

[0076] Activated by carbon dioxide gas, the activation temperature is 550°C, and the reaction time is 7h;

[0077] S6, intercalation oxidation

[0078] Mix the activated graphite with pyridinium chromate and oxalic acid for in...

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Abstract

The invention discloses a preparation method of graphite for a friction material. The preparation method comprises the following steps: S1, physical desulfurization; s2, chemical desulfurization; s3, drying and crushing: drying at 100-150 DEG C until the water content is lower than 5%, crushing and sieving with a 100-mesh sieve; s4, graphitization treatment: raising the temperature to 1800-2000 DEG C under the protection of inert gas, keeping the temperature for 240-360 hours, and carrying out graphitization treatment; s5, activation: carbon dioxide gas is adopted for activation, the activation temperature is 500-600 DEG C, and the reaction time is 6-8 h; and S6, intercalation oxidation: mixing the graphite activated in the step S5 with pyridinium chromate and oxalic acid, and carrying out intercalation oxidation reaction to obtain the expandable graphite. The prepared graphite serves as a lubricating component, and the mechanical performance and wear resistance of the friction material are well improved.

Description

technical field [0001] The invention belongs to the technical field of graphite, and in particular relates to a preparation method of graphite used for friction materials. Background technique [0002] Metal-based powder metallurgy friction materials are mainly processed into a friction material with high wear resistance through the powder metallurgy process of metal matrix, reinforcing phase, lubricating phase and grinding phase, mainly including iron-based, copper-based and iron-copper-based There are three types of powder metallurgy friction materials. Load, sliding velocity and temperature are the main factors affecting the friction and wear properties of metal-based powder metallurgy friction materials. Within the allowable pressure load range, the wear rate will not increase as the load increases; beyond the allowable pressure load range, the adhesive wear increases with the increase of the load, and the wear rate increases. As the sliding speed increases, the fricti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/205C01B32/225
CPCC01B32/205C01B32/225
Inventor 臧文平臧昜韩雪王鹏程赵杰徐韶民
Owner 唐山金湾特碳石墨有限公司
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