CN100377995C - Granular graphite for brake block and its prepn - Google Patents
Granular graphite for brake block and its prepn Download PDFInfo
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- CN100377995C CN100377995C CNB2006100484594A CN200610048459A CN100377995C CN 100377995 C CN100377995 C CN 100377995C CN B2006100484594 A CNB2006100484594 A CN B2006100484594A CN 200610048459 A CN200610048459 A CN 200610048459A CN 100377995 C CN100377995 C CN 100377995C
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- graphite
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- starch
- granular graphite
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Abstract
The present invention relates to one kind of granular graphite for brake block and its preparation process. The granular graphite is prepared with natural scale graphite as basic material and petroleum coke and starch as adhesive, and through mixing while adding water, pressing, stoving, crushing and sieving. The granular graphite may be used in making brake block with high compression strength, high porosity, high heat conductivity, high lubricant performance, low hardness, less friction, less noise, sensitive and smooth braking.
Description
Technical field
The invention belongs to the graphite product technical field, especially for granular graphite of brake facing and preparation method thereof.
Background technology
In technique known, brake facing in the Motor vehicles mainly adopts plurality of raw materials such as asbestos, steel fiber, resin to make, made brake facing has than great, shortcomings such as thermal conductivity is low, poor heat stability, noise height and non-refractory, has defectives such as brake poor reliability, quick abrasion, easily aging fracture, work-ing life be short.Secondly, prohibited use owing to contain carcinogenic substance in the asbestos by country.At present, substitute products as asbestos brake lining, the general materials such as mineral fibre, charcoal fiber, steel fiber that adopt are made, but all in various degree have shortcomings such as fusing point is low, thermostability is low, radiating effect is bad, frictional coefficient is little, braking quality is poor, work-ing life is short, manufacturing cost height, especially under frequently braking or scram state, the surface of friction of brake facing is easy to generate metal transfer and scuffing, causes the sensitivity of brake facing clutch to descend.
Along with the development of technology, graphite progressively begins to use in the improvement of brake facing with little, high temperature resistant, the high heat conduction of its distinctive proportion, self-lubricating, wear-resisting, stiff stability, anti-thermal shock and good performances such as plasticity-by force.No matter the brake of motor-driven vehicle sheet is asbestos brake lining or non-asbestos brake block; all to cook low friction compound with graphite; the first is in order to protect antithesis; it two is in order to reduce noise; but in the batch mixing process of making brake facing; powdered graphite is floating easily, causes environmental pollution, and its physicochemical property does not reach desirable requirement yet.Therefore, promote the brake facing grade, strengthen its use properties, selecting adaptive graphite material structure formation and preparation method thereof is the key of dealing with problems.At present, have the development and implementation of particle stone graphite material technology both at home and abroad, but be used for the making of electrode, battery product more, focus on the performance of the high conduction performance of granular graphite material, and poor performance such as its high temperature resistant, high pressure resistant, wear-resistant and heat conduction, heat radiation all can not be used in the making of brake facing.
Summary of the invention
The purpose of this invention is to provide and a kind ofly can be applied to manufacturing of brake of motor-driven vehicle sheet, and can improve the ultimate compression strength of brake facing effectively, have antifriction, de-noising, heat resistanceheat resistant look simultaneously and move back effective granular graphite.
Another object of the present invention provides a kind of preparation method who is used for granular graphite.
Realize that the technical scheme that purpose of the present invention is taked is: it by as the natural flake graphite of base-material with form compound as refinery coke, the starch of caking agent and add water and make, wherein, the mass percent of each component is in the compound: natural flake graphite 80～90%, refinery coke 5～10%, starch 5～10%, the weight proportion of compound and water is: compound: water=10: 1.
Granular graphite of the present invention, its preparation methods steps is as follows:
1) batching: take by weighing natural flake graphite 80～90% by mass percentage, refinery coke 5～10%, starch 5～10% is formed compound;
2) slurrying: compound placed add water in the airtight stirrer and stir, the weight proportion of compound and water is: compound: water=10: 1, and under 60～80 ℃ of temperature, stirring reaction half an hour, standing and reacting 10～15 hours is at normal temperatures promptly made the thick paste slurry then;
3) compacting: utilize molding device that graphite slurry is pressed into the disconnected joint material of column;
4) oven dry: the disconnected joint material of column is placed in the baking oven, and oven dry is 4～6 hours under 90～100 ℃, takes out naturally cooling then;
5) granulation: the disconnected joint material of the column graphite after utilizing disintegrating apparatus to dry is pulverized, and is respectively 8～14 orders according to granularity then, 14～24 orders, and 24～40 purpose specifications are carried out sub-sieve, promptly obtain the granular graphite goods of different size.
In the present invention, its performance of selected raw material and acting as: natural flake graphite perfect crystalline, brightness height, sheet approach and good toughness, physical and chemical performance is stable, has high temperature resistant, high pressure resistant, anti-oxidant, corrosion-resistant, self-lubricating and good characteristics such as tack, plasticity-, heat conductance and heat-shock resistance.Simultaneously, its profile aspect ratio is big, is irregular alignment through after the granulating, the void content height, and density is 1.6～1.8g/cm
3
Refinery coke (caking agent) is the irregular hard granular or column solid of face shaping, and its inside has multi-pore structure, and principal element consists of carbon, occupies more than the 80wt%, and remaining is hydrogen, oxygen, nitrogen, sulphur and metallic element.Because of its distinctive physicochemical property, make refinery coke not only have good tackiness, and have the various premium propertiess of high carbon species.
Starch (caking agent) has very strong gel force and good gelatinization effect.
The granular graphite of making according to selected raw material of the present invention and processing method; can improve the ultimate compression strength of brake facing; void content; thermal conductivity and oilness; reduce hardness; slow down friction; abate the noise and the heat resistanceheat resistant look moves back etc.; thereby effectively antithesis is braked in protection; make brake sensitive more and steady; and can improve arresting security; reliability and comfort level; simultaneously in the batch mixing process of making brake facing; can eliminate the puzzlement of dust; reduce the pollution in producing; can also reduce the usage quantity of caking agent in the brake facing; reduce the manufacturing cost of brake facing, can be widely used in brake facing; brake band; clutch friction plate; braking devices such as train brake shoe brake shoes.
Embodiment
Granular graphite of the present invention, be as base-material by natural flake graphite, refinery coke and starch are formed compound as caking agent, the mass percent that each proportion of raw materials amount adopts is: natural flake graphite 80～90%, refinery coke 5～10%, legume starch 5～10% mixes with water then, repressed again, oven dry are pulverized sub-sieve at last and are formed.
Embodiment 1
Take by weighing natural high-carbon crystalline flake graphite 80%, refinery coke 10%, starch 10% by mass percentage, make as follows then: raw material is mixed placing in the airtight stirrer earlier, again according to compound: water=add water stir at 10: 1, the weight proportion of compound and water is: compound: water=10: 1, under 62 ℃ of temperature, stir half an hour, and left standstill at normal temperatures 10 hours, make the thick paste graphite slurry; Utilize molding device that graphite slurry is pressed into the disconnected joint of column then and expect, the more disconnected joint material of column is placed drying plant, dry down at 90 ℃ and took out naturally cooling in 4.5 hours; Disconnected joint material after utilizing disintegrating apparatus to dry is at last pulverized, again according to 8～14 orders, and 14～24 orders, 24～40 purpose specifications are carried out sub-sieve, promptly obtain the granular graphite goods of different size.
Embodiment 2
Take by weighing natural high-carbon crystalline flake graphite 85%, refinery coke 10%, starch 5% by mass percentage, its making step is substantially the same manner as Example 1, and difference is: whipping temp is 70 ℃, and time of repose is 13 hours; 95 ℃ of bake out temperatures, drying time are 5 hours.
Embodiment 3
Take by weighing natural high-carbon crystalline flake graphite 90%, refinery coke 5%, starch 5% by weight percentage, its making step is substantially the same manner as Example 1, and difference is: whipping temp is 80 ℃, and stirring the back time of repose is 15 hours; 100 ℃ of bake out temperatures, drying time are 6 hours.
Embodiment 4
Take by weighing natural high-carbon crystalline flake graphite 85%, refinery coke 7%, starch 8% by weight percentage, its making step is substantially the same manner as Example 1, and difference is: whipping temp is 75 ℃, and to stir the back time of repose be 14 hours; 98 ℃ of bake out temperatures, drying time are 5.5 hours.
Claims (2)
1. granular graphite that is used for brake facing, it is characterized in that: it by as the natural flake graphite of base-material with form compound as refinery coke, the starch of binding agent and add water and make, wherein, the mass percent of each component is in the compound: natural flake graphite 80～90%, refinery coke 5～10%, starch 5～10%, the weight proportion of compound and water is: compound: water=10: 1.
2. method for preparing the granular graphite that is used for brake facing, it is characterized in that: the concrete steps of this method are:
1) batching: press natural flake graphite 80～90%, refinery coke 5～10%, the mass percent of starch 5～10% takes by weighing raw material, and raw material is mixed;
2) slurrying: compound placed add water in the airtight stirrer and stir, the weight proportion of compound and water is: compound: water=10: 1, and under 60～80 ℃ of temperature, stirring reaction half an hour, standing and reacting 10～15 hours at normal temperatures promptly becomes pasty slurry then;
3) compacting: utilize molding device that graphite slurry is pressed into the disconnected joint material of column:
4) oven dry: the disconnected joint material of column is placed in the baking oven, and oven dry is 4～6 hours under 90～100 ℃, takes out naturally cooling then:
5) granulation: utilize the disconnected joint material of column after disintegrating apparatus will be dried to pulverize, be respectively 8～14 orders according to granularity then, 14～24 orders, 24～40 purpose specifications are carried out sub-sieve, promptly obtain the granular graphite goods of different size.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100484594A CN100377995C (en) | 2006-07-26 | 2006-07-26 | Granular graphite for brake block and its prepn |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100484594A CN100377995C (en) | 2006-07-26 | 2006-07-26 | Granular graphite for brake block and its prepn |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1887795A CN1887795A (en) | 2007-01-03 |
| CN100377995C true CN100377995C (en) | 2008-04-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100484594A Expired - Fee Related CN100377995C (en) | 2006-07-26 | 2006-07-26 | Granular graphite for brake block and its prepn |
Country Status (1)
| Country | Link |
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| CN (1) | CN100377995C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5277483B2 (en) * | 2007-06-07 | 2013-08-28 | イビデン株式会社 | Graphite material |
| CN104386669A (en) * | 2014-04-22 | 2015-03-04 | 天津锦美碳材科技发展有限公司 | High-rebound-elasticity porous graphite material and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1167077A (en) * | 1997-04-19 | 1997-12-10 | 梅昌国 | Method for preparing high-carbon graphite grain |
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2006
- 2006-07-26 CN CNB2006100484594A patent/CN100377995C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1167077A (en) * | 1997-04-19 | 1997-12-10 | 梅昌国 | Method for preparing high-carbon graphite grain |
Non-Patent Citations (1)
| Title |
|---|
| 低压力高力矩粉末冶金摩擦材料的研制. 樊毅，袁国洲.粉末冶金材料科学与工程，第1期. 2006 * |
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| CN1887795A (en) | 2007-01-03 |
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