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Copper-based powder metallurgy friction material for dry clutch of heavy-duty vehicle and preparation method thereof

A dry clutch and powder metallurgy technology, which is used in metal processing equipment, transportation and packaging, can solve the problems of temperature rise of friction materials, long preparation process and decrease of friction coefficient, and achieve good friction stability and wear resistance, The preparation method has simple steps and the effect of stabilizing the friction coefficient

Active Publication Date: 2019-08-09
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The patent document (CN 106011520 A) discloses "a dry-type copper-based powder metallurgy friction material for clutches and its preparation method". The static friction coefficient and average coefficient of the material prepared by this method are not high, so it can only be applied to tractor dry clutches. The patch cannot meet the needs of other large and heavy-duty vehicles for smooth and fast transmission
Patent literature (CN101666364 A), patent literature (CN 105179537 A) and patent literature (CN 1594621 A) respectively disclose "a copper-based powder metallurgy clutch friction body", "a heavy-duty vehicle clutch copper-based friction plate and its production method" and "a copper-based powder metallurgy friction material", all of these three friction plates contain lead, which has serious environmental pollution and is banned internationally, and cannot be popularized and applied
The patent document (CN 105238351 A) discloses "Friction material for transmission and braking and products with the friction material". The lower copper content in the friction plate weakens the heat dissipation performance of the material, and it is easy to bring friction material during the friction process. As the temperature rises, the coefficient of friction decreases due to thermal decay, which is not suitable for the transmission and braking of vehicles and equipment under high-energy conditions.
Patent literature (CN106702204 A) and patent literature (CN 107737916 A) respectively disclose "copper-based powder metallurgy friction material and its preparation method" and "nanomaterial modified copper-based powder metallurgy friction material and its preparation method". The preparation methods all use nanoparticles to enhance the strength and wear resistance of the material. The mixing of nanoparticles and other components is more complicated, and the dispersion and mixing of nanoparticles must be realized by means of a solution method. The preparation process is long and the quality stability is not easy to control, so it is not suitable Industrial scale promotion
The patent document (CN104419845 A) discloses "a high-performance copper-based friction plate and its production process". The copper content of this material is as high as 80wt.%, and the average friction coefficient under high-energy braking is only as low as 0.20 Left and right, unable to meet the requirements of heavy-duty vehicles
The patent document (CN 107299300 A) discloses "a heavy-duty low-wear copper-based friction material and its preparation method". The material uses chopped carbon fiber to strengthen the material, and its production cost is high. Low coefficient, only suitable for vehicles under light load conditions

Method used

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  • Copper-based powder metallurgy friction material for dry clutch of heavy-duty vehicle and preparation method thereof
  • Copper-based powder metallurgy friction material for dry clutch of heavy-duty vehicle and preparation method thereof
  • Copper-based powder metallurgy friction material for dry clutch of heavy-duty vehicle and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Prepare the mixture according to the weight ratio of the ingredients: including copper powder 55%, iron powder 6%, graphite particle powder 17%, flake graphite 2%, molybdenum disulfide powder 2%, petroleum coke powder 1%, ferrochrome powder 6%, oxide Zirconium 6%, silicon dioxide 3%, tin powder 2%. Mix the mixture in a V-type mixer for 4 hours, press it under a pressure of 400MPa to obtain a compact, place the compact on a copper-plated steel back, and sinter in a bell-type pressure sintering furnace at a sintering temperature of 900°C. The holding time is 2h, the sintering pressure is 3.0MPa, and the sintering atmosphere is ammonia decomposition. After the heat preservation is over, first cool down with the furnace to below 700°C, then remove the heating furnace body, air-cool to below 550°C, and finally water-cool to below 80°C. The physical and mechanical properties of friction materials are shown in Table 1.

[0035] Table 1 physical and mechanical properties

[...

Embodiment 2

[0042] Prepare the mixture according to the weight ratio of the ingredients: including copper powder 52%, iron powder 9%, graphite particle powder 12%, flake graphite 2%, molybdenum disulfide powder 2%, petroleum coke powder 6%, ferrochrome powder 5%, oxidation Zirconium 8%, silicon dioxide 1%, tin powder 3%. The mixture was mixed in a V-type mixer for 6 hours, pressed under a pressure of 480MPa to obtain a compact, placed on a copper-plated steel back, and sintered in a bell-type pressure sintering furnace at a sintering temperature of 900°C. The holding time is 3h, the sintering pressure is 2.0MPa, and the sintering atmosphere is ammonia decomposition. After the heat preservation is over, first cool down with the furnace to below 700°C, then remove the heating furnace body, air-cool to below 550°C, and finally water-cool to below 80°C. The physical and mechanical properties of friction materials are shown in Table 3.

[0043] Table 3 physical and mechanical properties of m...

Embodiment 3

[0049] Prepare the mixture according to the weight ratio of the ingredients: including copper powder 60%, iron powder 6%, graphite particle powder 6%, flake graphite 3%, molybdenum disulfide powder 1%, petroleum coke powder 12%, ferrochrome powder 4%, oxide Zirconium 4%, silicon dioxide 3%, tin powder 1%. The mixture was mixed in a V-type mixer for 8 hours, pressed under a pressure of 400MPa to obtain a compact, placed on a copper-plated steel back, and sintered in a bell-type pressure sintering furnace at a sintering temperature of 920°C. The holding time is 2h, the sintering pressure is 4.0MPa, and the sintering atmosphere is pure hydrogen. After the heat preservation is over, first cool down with the furnace to below 700°C, then remove the heating furnace body, air-cool to below 550°C, and finally water-cool to below 80°C. The physical and mechanical properties of the friction materials are shown in Table 5.

[0050] Table 5 Physical and Mechanical Properties of Materials...

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Abstract

The invention discloses a copper-based powder metallurgy friction material for a dry clutch of a heavy-duty vehicle and a preparation method thereof. The matrix component of the friction material is copper and iron; the lubricating component is graphite particles, crystalline flake graphite, molybdenum disulfide and petroleum coke; the friction component is ferrochrome, zirconia and silicon dioxide; and the strengthening component is tin. The friction material comprises the following, by weight 50%-60% of copper powders, 1%-10% of iron powders, 5%-20% of graphite particle powders, 1%-5% of flake graphite, 1%-6% of molybdenum disulfide powders, 1%-15% of petroleum coke powders, 3%-9% of ferrochrome powders, 3%-9% of the zirconia, 1%-5% of the silicon dioxide, and 1%-4% of tin powders. The preparation method of the friction material comprises the following steps of mixing a mixture according to the composition of the powder metallurgical friction material; mixing the mixture in a V-shaped mixer evenly and pressing; and then sintering together with a copper-plated steel back to obtain the copper-based powder metallurgical friction material. The copper-based powder metallurgy frictionmaterial has high and stable friction coefficients and excellent wear resistance.

Description

technical field [0001] The invention relates to a copper-based powder metallurgy friction material and a preparation method thereof, in particular to a copper-based powder metallurgy friction material for heavy-duty vehicle dry clutches, and belongs to the technical field of powder metallurgy friction materials and its preparation. Background technique [0002] Heavy-duty vehicles play an extremely important role in my country's transportation industry, undertaking most of the transportation work of my country's road transportation industry and the important task of safeguarding national defense security. With the development of my country's national economy and national defense construction, the advantages of heavy-duty vehicles are highlighted, and the scope of application is becoming wider and wider. [0003] Friction material is a key component used in the clutch for power transmission and braking during vehicle running. Its performance is related to whether the vehicle ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/14C22C9/00C22C32/00C22C1/05
CPCB22F3/14C22C9/00C22C32/0084C22C1/05B22F2998/10B22F1/105B22F3/02
Inventor 刘如铁林雪杨汪琳李政舟熊翔廖宁陈洁
Owner CENT SOUTH UNIV
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