Powder metallurgy brake pad friction material for high-speed train and preparation method thereof
A powder metallurgy and friction material technology, which is applied to the preparation of powder metallurgy brake pads for high-speed trains and the field of powder metallurgy brake pad friction materials for high-speed trains, can solve the problems of friction coefficient decline, high temperature mechanical properties decline, complex composition and other problems
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preparation example Construction
[0035] According to the third aspect of the present invention, there is provided a method for preparing powder metallurgy brake pads for high-speed trains, comprising: weighing metal matrix powder, graphene / MoS 2 Nanocomposite materials, optional nickel powder and optional mullite are added with a liquid binder, stirred, cold-pressed, and sintered to obtain the powder metallurgy brake sheet.
[0036] In a preferred embodiment of the present invention, the liquid binder is kerosene or other organic liquid binders with a viscosity not greater than 30mPa·s;
[0037] In a preferred embodiment of the present invention, the conditions of the stirring treatment include: the stirring speed is 400-600r / min, and the stirring time is 10-30min;
[0038] In a preferred embodiment of the present invention, the cooling forming conditions include: holding pressure for 5-20s at room temperature and 40-50MPa;
[0039] In a preferred embodiment of the present invention, the conditions of the si...
preparation example 1
[0045] The graphene oxide nanosheets were vacuum ball milled for 5 hours at a ball milling speed of 150 r / min. Take 0.1g of ball-milled graphene oxide nanosheets and add them into deionized water and disperse them with ultrasonic wave for 1h, then add 1g of sodium molybdate, 1.4g of sodium thiocyanate, 0.5g of PVP, and 5ml of sodium hydroxide with a concentration of 0.75mol / L. After stirring for 30 minutes, the solution was placed in a stainless steel hot water reactor lined with polytetrafluoroethylene and sealed, and reacted at 200°C for 24 hours. The obtained product was cooled at room temperature, washed 3 times with distilled water and 3 times with absolute ethanol, and dried in a vacuum oven at 50°C for 12 hours to obtain graphene / MoS 2 Nanocomposite A.
[0046] The microscopic morphology of the product of this preparation example was observed using a scanning electron microscope, and the prepared graphene / MoS 2 The nanocomposite material is a fine nano-flake with elli...
preparation example 2
[0048] The graphene oxide nanosheets were vacuum ball milled for 10 h at a ball milling speed of 150 r / min. Take 0.1g of ball-milled graphene oxide nanosheets and add them into deionized water and disperse them with ultrasonic wave for 1h, then add 1g of sodium molybdate, 1.4g of sodium thiocyanate, 0.5g of PVP, and 5ml of sodium hydroxide with a concentration of 0.75mol / L. After stirring for 30 minutes, the solution was placed in a stainless steel hot water reactor lined with polytetrafluoroethylene and sealed, and reacted at 220°C for 24 hours. The obtained product was cooled at room temperature, washed 3 times with distilled water and 3 times with absolute ethanol, and dried in a vacuum oven at 50°C for 12 hours to obtain graphene / MoS 2 Nanocomposite B.
[0049] The microscopic morphology of the product of this preparation example was observed using a scanning electron microscope, and the prepared graphene / MoS 2 The nanocomposite material is a fine nano-flake with ellipso...
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Abstract
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