CN112682446B - Preparation method of high-wear-resistance sector clutch friction block - Google Patents
Preparation method of high-wear-resistance sector clutch friction block Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a preparation method of a high-wear-resistance fan-shaped clutch friction block, and relates to the technical field of friction materials.
Description
The technical field is as follows:
the invention relates to the technical field of friction materials, in particular to a preparation method of a high-wear-resistance sector clutch friction block.
Background art:
the clutch is positioned in a flywheel shell between the engine and the gearbox, the clutch assembly is fixed on the rear plane of the flywheel by screws, and the output shaft of the clutch is the input shaft of the gearbox. During the running of the automobile, the driver can press or release the clutch pedal according to the requirement, so that the engine and the gearbox are temporarily separated and gradually jointed, and the power input by the engine to the gearbox is cut off or transmitted. Clutches are common components in mechanical transmissions, and allow the transmission to be disengaged or engaged at any time.
The clutch is divided into an electromagnetic clutch, a magnetic powder clutch, a friction clutch and a hydraulic clutch, wherein the friction clutch is the clutch which is most widely applied and has the longest history, friction elements comprise a plate type (made into a fan shape) and a block type, the plate type is used in a multi-disc type friction clutch and a brake, and the block type is used in a single-disc floating insert type friction clutch and a brake.
The metal-based friction material has the characteristics of high strength, high friction coefficient, wear resistance, good thermal conductivity and the like, and is widely applied. The common clutch friction block takes copper as a base body, and hard alloy particles and lubricating particles which are uniformly distributed regulate and control the friction coefficient and the wear rate, but the cost is high, so that other materials need to be adopted for replacement under the condition of considering the cost.
The invention content is as follows:
the invention aims to solve the technical problem of providing a preparation method of a high-wear-resistance fan-shaped clutch friction block, which adopts sepiolite fibers and basalt fibers to prepare a fiber-based friction material to replace the conventional metal-based friction material, reduces the processing cost on the basis of ensuring the application effect of the friction block, has wide sources, low processing cost and easy recovery compared with metals, and can realize sustainable development.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
the preparation method of the high-wear-resistance sector clutch friction block comprises the following steps:
(1) placing the sepiolite fibers in a muffle furnace, heating and calcining, cooling to below 80 ℃, adding vinyl tributyrinoxime silane and an organic initiator, carrying out ultrasonic reaction under the protection of inert gas, cooling to room temperature, and crushing into micro powder to obtain modified sepiolite fibers;
(2) adding the modified sepiolite fibers, the basalt fibers, the superfine polytetrafluoroethylene powder and the silicon micropowder into a mixer, and uniformly mixing to obtain mixed powder;
(3) adding the mixed powder into a mold, performing hot-press molding, setting the hot-press temperature at 150-;
(4) and performing finish machining on the semi-finished product to obtain the sector clutch friction block.
The calcining temperature of the sepiolite fiber is 400-500 ℃, and the calcining time is 1-3 h.
The mass ratio of the sepiolite fibers to the vinyl tributyrinoxime silane is 100: 20-50.
The temperature of the ultrasonic reaction is 80-100 ℃, and the time is 2-10 h.
The organic initiator is selected from one or more of benzoyl peroxide, dicumyl peroxide, tert-butyl peroxybenzoate, methyl ethyl ketone peroxide and dicyclohexyl peroxydicarbonate.
The organic initiator belongs to an organic peroxide initiator, and has good thermal stability and high initiation efficiency.
The molar weight of the organic initiator is 0.5-5% of that of the vinyl tributyrinoxime silane.
The basalt fibers are chopped basalt fibers, and the length of the basalt fibers is 1-3 mm.
The mass ratio of the modified sepiolite fibers, the basalt fibers, the superfine polytetrafluoroethylene powder and the silicon micro powder is 50-100:10-30:5-15: 5-15.
The basalt fiber is a continuous fiber which is formed by melting basalt stone at 1450-1500 ℃ and drawing the basalt stone at high speed through a platinum-rhodium alloy wire drawing bushing, and is a novel inorganic environment-friendly green high-performance fiber material. The basalt fiber has high strength, also has various excellent performances of electrical insulation, corrosion resistance, high temperature resistance and the like, and has been widely applied to various aspects of fiber reinforced composite materials, friction materials, shipbuilding materials, heat insulation materials, automobile industry, high-temperature filter fabrics, protection fields and the like. The basalt fiber is used as a preparation raw material of the friction block, so that the wear resistance can be enhanced, and the high-wear-resistance friction block can be prepared.
The sepiolite fiber has wide sources and better wear resistance and heat resistance, and the sepiolite fiber is used as the friction block preparation raw material, so that the preparation cost can be reduced (compared with basalt fiber, the price of the sepiolite fiber is relatively low, and the dosage of the basalt fiber can be reduced by adding the sepiolite fiber), and the wear resistance of the friction block can be ensured. The sepiolite fibers have strong adsorbability, so that the problem of agglomeration is easy to occur during material blending, and the agglomeration of the sepiolite fibers also affects the uniform dispersion of the basalt fibers, so that the uniform dispersion of the sepiolite fibers in the preparation raw materials is very critical. The invention is based on a mode of combining physical modification and chemical modification, and adopts vinyl tributyrinoxime silane to carry out modification treatment on sepiolite fibers. The vinyl tributyrinoxime silane generates a polymer under the action of an initiator, the polymer and the sepiolite fibers are bonded and crosslinked to form a compound with a network structure, the compatibility of the sepiolite fibers and the raw materials for preparing the friction block can be improved, the friction coefficient of the friction block can be regulated, the friction block has excellent wear resistance and moderate friction coefficient, and the normal work of the friction block is ensured.
The vinyl tributyrinoxime silane belongs to liquid, the organic initiator can be dissolved in the vinyl tributyrinoxime silane, so that no reaction solvent is added during the preparation of the modified sepiolite fiber, the preparation cost can be reduced, the process environmental protection is improved, and the conversion rate of the vinyl tributyrinoxime silane is over 99 percent under the action of ultrasonic waves.
The polytetrafluoroethylene has excellent high temperature resistance, corrosion resistance, electrical insulation and aging resistance, has small friction coefficient, and can be used for regulating and controlling the friction coefficient of the clutch friction block; and the polytetrafluoroethylene is added, so that smooth demolding of the semi-finished product can be guaranteed, and a demolding agent is not required to be coated on a hot-pressing mold, so that the processing cost is reduced.
The silicon micropowder has the characteristics of wear resistance, corrosion resistance, high temperature resistance, electric insulation and weather resistance, the wear resistance of the friction block can be further optimized by adding the silicon micropowder, and meanwhile, the friction coefficient of the friction block can be regulated and controlled by fine particles of the silicon micropowder.
The service life of the friction block is directly influenced by heat generated by friction in the working process of the friction block, so that the friction block is required to have certain heat-conducting property besides excellent wear-resisting property. And the heat conductivity coefficient of the sepiolite fibers is low, so that the heat conduction effect of the friction block can be directly influenced. The modified sepiolite fiber can regulate and control the friction performance of the friction block, can improve the heat conduction performance of the friction block, and enables heat generated by friction to be dissipated quickly, so that adverse effects caused by heat accumulation are avoided.
The main component of the conventional silicon micropowder in the field is silicon dioxide, and although the silicon dioxide has thermal conductivity, the thermal conductivity effect is poor, so in order to optimize the thermal conductivity of the silicon micropowder, the self-made silicon micropowder is used for replacing the conventional silicon micropowder in the field, and the preparation technical scheme is as follows:
the silicon micropowder is prepared from quartz powder and polyaryletherketone, and the preparation method comprises the following steps: heating polyaryletherketone to above 340 ℃, keeping the temperature and stirring, adding quartz powder when polyaryletherketone is completely melted, mixing, cooling, and crushing into micro powder to obtain silicon micro powder.
The mass ratio of the quartz powder to the polyaryletherketone is 10-20: 1-10.
The crystallinity of the polyaryletherketone is utilized to improve the thermal conductivity of the silicon dioxide, and the polyaryletherketone has high strength and can further optimize the friction performance of the friction block.
The invention has the beneficial effects that: the invention adopts the sepiolite fibers and the basalt fibers to prepare the fiber-based friction material to replace the conventional metal-based friction material, reduces the processing cost on the basis of ensuring the application effect of the friction block, has wide sources, low processing cost and easy recovery compared with metals, and can realize sustainable development.
The specific implementation mode is as follows:
in order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described in the following combined with the specific embodiments.
Example 1
(1) Placing 100g of sepiolite fibers in a muffle furnace, heating to 500 ℃, calcining for 3h, cooling to below 80 ℃, adding 31g of vinyl tributyrinoxime silane and 0.5g of tert-butyl peroxybenzoate, carrying out ultrasonic reaction for 5h under the protection of inert gas, cooling to room temperature, and crushing into micro powder to obtain modified sepiolite fibers;
(2) adding 82g of modified sepiolite fibers, 13g of chopped basalt fibers, 8g of superfine polytetrafluoroethylene powder and 8g of silicon micro powder into a mixer, and mixing for 10min at the rotating speed of 800r/min to obtain mixed powder;
(3) adding the mixed powder into a mold preheated to 100 ℃, performing hot-press molding, setting the hot-press temperature at 180 ℃, the hot-press pressure at 15MPa, the hot-press time at 10min, exhausting once at intervals of 30s, cooling, and demolding to obtain a semi-finished product;
(4) and performing finish machining on the semi-finished product to obtain the sector clutch friction block.
Example 2
(1) Placing 100g of sepiolite fibers in a muffle furnace, heating to 500 ℃, calcining for 3h, cooling to below 80 ℃, adding 31g of vinyl tributyrinoxime silane and 0.5g of tert-butyl peroxybenzoate, carrying out ultrasonic reaction for 5h under the protection of inert gas, cooling to room temperature, and crushing into micro powder to obtain modified sepiolite fibers;
(2) adding 88g of modified sepiolite fibers, 15g of chopped basalt fibers, 10g of superfine polytetrafluoroethylene powder and 10g of silicon micro powder into a mixer, and mixing for 10min at the rotating speed of 800r/min to obtain mixed powder;
(3) adding the mixed powder into a mold preheated to 100 ℃, performing hot-press molding, setting the hot-press temperature at 180 ℃, the hot-press pressure at 15MPa, the hot-press time at 10min, exhausting once every 30s, cooling, and demolding to obtain a semi-finished product;
(4) and performing finish machining on the semi-finished product to obtain the sector clutch friction block.
Example 3
(1) Placing 100g of sepiolite fibers in a muffle furnace, heating to 500 ℃, calcining for 3h, cooling to below 80 ℃, adding 31g of vinyl tributyrinoxime silane and 0.5g of tert-butyl peroxybenzoate, carrying out ultrasonic reaction for 5h under the protection of inert gas, cooling to room temperature, and crushing into micro powder to obtain modified sepiolite fibers;
(2) the silicon micropowder is prepared from quartz powder and polyaryletherketone, and the preparation method comprises the following steps: heating 5g of polyaryletherketone to 350 ℃ at the rotation speed of 150r/min, preserving heat, stirring, adding 14g of quartz powder to mix for 15min after the polyaryletherketone is completely melted, cooling, and crushing into micro powder to obtain silicon micro powder;
(3) adding 88g of modified sepiolite fibers, 15g of chopped basalt fibers, 10g of superfine polytetrafluoroethylene powder and 10g of silicon micro powder into a mixer, and mixing for 10min at the rotating speed of 800r/min to obtain mixed powder;
(4) adding the mixed powder into a mold preheated to 100 ℃, performing hot-press molding, setting the hot-press temperature at 180 ℃, the hot-press pressure at 15MPa, the hot-press time at 10min, exhausting once at intervals of 30s, cooling, and demolding to obtain a semi-finished product;
(5) and performing finish machining on the semi-finished product to obtain the sector clutch friction block.
Example 4
(1) Placing 100g of sepiolite fibers in a muffle furnace, heating to 500 ℃, calcining for 3h, cooling to below 80 ℃, adding 31g of vinyl tributyrinoxime silane and 0.5g of tert-butyl peroxybenzoate, carrying out ultrasonic reaction for 5h under the protection of inert gas, cooling to room temperature, and crushing into micro powder to obtain modified sepiolite fibers;
(2) the silicon micropowder is prepared from quartz powder and polyaryletherketone, and the preparation method comprises the following steps: heating 3g of polyaryletherketone to 350 ℃ at the rotating speed of 150r/min, preserving heat, stirring, adding 12g of quartz powder when the polyaryletherketone is completely melted, mixing for 15min, cooling, and crushing into micro powder to obtain silicon micro powder;
(3) adding 88g of modified sepiolite fibers, 15g of chopped basalt fibers, 10g of superfine polytetrafluoroethylene powder and 10g of silicon micro powder into a mixer, and mixing for 10min at the rotating speed of 800r/min to obtain mixed powder;
(4) adding the mixed powder into a mold preheated to 100 ℃, performing hot-press molding, setting the hot-press temperature at 180 ℃, the hot-press pressure at 15MPa, the hot-press time at 10min, exhausting once at intervals of 30s, cooling, and demolding to obtain a semi-finished product;
(5) and performing finish machining on the semi-finished product to obtain the sector clutch friction block.
Comparative example
A comparative example was obtained by replacing the modified sepiolite fibers described in example 1 with an equal amount of unmodified sepiolite fibers, using example 1 as a control.
The friction and thermal conductivity tests were performed on the same-sized friction blocks prepared in examples 1 to 4 and comparative example.
The friction coefficient mu and the wear rate V of the friction block are tested according to GB/T5764 and 2011 clutch facing for automobiles.
Test equipment and test conditions: the constant speed friction tester has the friction surface size of 25mm multiplied by 25mm, the disc rotating speed of 500r/min, the pressure of 0.49MPa, the testing time of 1h and the temperature of the friction surface of the disc of the tester of 200 ℃.
The coefficient of thermal conductivity of the friction block was tested using a laser thermal conductivity meter LFA 427.
TABLE 1
| Coefficient of friction | Wear rate 10 -7 cm 3 /(N.m) | Thermal conductivity W/(m.K) | |
| Example 1 | 0.40 | 0.12 | 42.7 |
| Example 2 | 0.42 | 0.16 | 41.8 |
| Example 3 | 0.45 | 0.18 | 46.5 |
| Example 4 | 0.45 | 0.18 | 47.3 |
| Comparative example | 0.48 | 0.23 | 35.2 |
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. The preparation method of the high-wear-resistance sector clutch friction block is characterized by comprising the following steps of: the method comprises the following steps:
(1) putting the sepiolite fibers into a muffle furnace, heating and calcining, cooling to below 80 ℃, adding vinyl tributyrinoxime silane and an organic initiator, carrying out ultrasonic reaction under the protection of inert gas, cooling to room temperature, and crushing into micro powder to obtain modified sepiolite fibers;
(2) adding the modified sepiolite fibers, the basalt fibers, the superfine polytetrafluoroethylene powder and the silicon micropowder into a mixer, and uniformly mixing to obtain mixed powder;
(3) adding the mixed powder into a mold, performing hot-press molding at the hot-press temperature of 150-200 ℃, the hot-press pressure of 10-20MPa and the hot-press time of 5-20min, cooling, and demolding to obtain a semi-finished product;
(4) performing finish machining on the semi-finished product to obtain a sector clutch friction block;
the mass ratio of the sepiolite fibers to the vinyl tributyrinoxime silane is 100: 20-50;
the mass ratio of the modified sepiolite fibers to the basalt fibers to the superfine polytetrafluoroethylene powder to the silicon micropowder is 50-100:10-30:5-15: 5-15.
2. The method for preparing the high-wear-resistance sector clutch friction block according to claim 1, characterized in that: the calcining temperature of the sepiolite fiber is 400-500 ℃, and the calcining time is 1-3 h.
3. The method for preparing a high wear-resistant sector clutch friction block according to claim 1, characterized in that: the temperature of the ultrasonic reaction is 80-100 ℃, and the time is 2-10 h.
4. The method for preparing a high wear-resistant sector clutch friction block according to claim 1, characterized in that: the organic initiator is selected from one or more of benzoyl peroxide, dicumyl peroxide, tert-butyl peroxybenzoate, methyl ethyl ketone peroxide and dicyclohexyl peroxydicarbonate.
5. The method for preparing a high wear-resistant sector clutch friction block according to claim 1, characterized in that: the molar weight of the organic initiator is 0.5-5% of that of the vinyl tributyrinoxime silane.
6. The method for preparing a high wear-resistant sector clutch friction block according to claim 1, characterized in that: the basalt fibers are chopped basalt fibers, and the length of the basalt fibers is 1-3 mm.
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| CN108373276A (en) * | 2018-03-12 | 2018-08-07 | 合肥尚涵装饰工程有限公司 | A kind of composite enhanced cement of environmental protection and preparation method thereof |
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| CN102816409B (en) * | 2012-08-24 | 2014-05-07 | 宁波市阳光汽车配件有限公司 | Friction material for clutch |
| CN106051004A (en) * | 2016-06-29 | 2016-10-26 | 芜湖德业摩擦材料有限公司 | Dedicated friction material for car brake pad |
| US20200332851A1 (en) * | 2017-10-26 | 2020-10-22 | Hitachi Chemical Company, Ltd. | Frictional member, and frictional material composition and frictional material for lower-layer material |
| CN107893330A (en) * | 2017-12-28 | 2018-04-10 | 安徽宏实光机电高科有限公司 | A kind of preparation method of plasma grafting processing complex fiber material |
| CN112228483B (en) * | 2019-11-06 | 2022-05-17 | 晋江市凯燕新材料研究院股份有限公司 | Modified organic filling material for friction material and preparation process thereof |
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| CN108373276A (en) * | 2018-03-12 | 2018-08-07 | 合肥尚涵装饰工程有限公司 | A kind of composite enhanced cement of environmental protection and preparation method thereof |
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