CN-115572856-A - Graphene-reinforced high-speed train brake pad material and preparation method thereof

CN115572856ACN 115572856 ACN115572856 ACN 115572856ACN-115572856-A

Abstract

The invention relates to a graphene reinforced high-speed train brake pad material and a preparation method thereof, belongs to the technical field of powder metallurgy friction materials, and solves the technical problems of high requirements on strength, wear resistance and high temperature resistance of the high-speed train brake pad material, and the solution is as follows: the raw materials of the composite material comprise a base component, a base reinforcing component, a friction component and a lubricating component, wherein the sum of the mass percentage of each component is 100 percent, and the composite material specifically comprises copper powder, graphene or graphene oxide, iron powder, chromium oxide, zirconium oxide, graphite and molybdenum disulfide, and the preparation process comprises four process sections of ball milling, material mixing, mould pressing and sintering. The graphene reinforced high-speed train brake pad prepared by the invention has the characteristics of high strength, good temperature resistance and good wear resistance, and can completely meet the braking requirement of a high-speed train at the speed of 350Km/h or above.

Inventors

LIU ZHANJUN
ZHANG DONGQING
LIU BEN

Assignees

KEXING RUIERWEI NEW MAT YANGZHOU CO LTD

Dates

Publication Date: 20230106
Application Date: 20221024
Priority Date: 20221024

Claims (2)

1. The utility model provides a graphite alkene reinforcing high speed train brake lining material which characterized in that: the lubricant comprises a base body component, a base body reinforcing component, a friction component and a lubricating component, wherein the sum of the mass percent of the components is 100%; the base body component is copper powder, the copper powder is atomized copper powder or electrolytic copper powder, and the mass percentage content of the base body component is 45-70%; the matrix reinforcing component consists of graphene and iron powder or consists of graphene oxide and iron powder, wherein the iron powder is reduced iron powder, the mass percent of the iron powder is 3-20%, and the mass percent of the graphene or the graphene oxide is 0.2-2%; the friction component consists of chromium oxide powder and zirconium oxide powder, and the mass percentage content of the friction component is 6-15%; the lubricating component consists of graphite and molybdenum disulfide, and the mass percentage content of the lubricating component is 5-18%.
2. The preparation method of the graphene reinforced high-speed train brake pad material according to claim 1, characterized by comprising the following steps: s1, weighing copper powder and graphene or graphene oxide according to the mass percentage, putting the weighed raw materials into a vacuum ball milling tank for ball milling for 5-15 minutes, and uniformly mixing the graphene into matrix components through mechanical alloying; and S2, adding a friction component and a lubricating component into the raw materials subjected to ball milling in the step S1 according to the mass percentage, mixing, molding and sintering to obtain the material for the graphene reinforced high-speed train brake pad, wherein the compression molding pressure is 300-500 MPa, the sintering temperature is 900-1000 ℃, the constant temperature time is 1-4 hours, and the protective gas is hydrogen.

Description

Graphene-reinforced high-speed train brake pad material and preparation method thereof Technical Field The invention belongs to the technical field of powder metallurgy friction materials, and particularly relates to a graphene reinforced high-speed train brake pad material and a preparation method thereof. Background The high-speed train is fully loaded with nearly 1000 tons, the highest running speed reaches 400Km/h, the kinetic energy of the train is consumed by the friction of the brake pad and the brake disc to achieve the braking purpose, particularly, under the high-speed emergency braking condition, the brake pad and the brake disc instantly bear huge friction force and shearing force, the working condition is extremely severe, and high requirements on the aspects of the strength, heat resistance, wear resistance and the like of a braking friction material are provided. Graphene is a hexagonal honeycomb-shaped two-dimensional carbon nanomaterial consisting of carbon atoms, has excellent mechanical and thermal conductivity, has the tensile strength of 130GPa and the thermal conductivity as high as 5300W/m.K, and is one of the currently known materials with the highest strength and the highest thermal conductivity. In order to meet the severe requirements of high-speed rail braking on material performance, graphene is added into the friction material, and the heat resistance and the wear resistance of the friction material are further enhanced by utilizing the special performance of the graphene on the microscopic scale. Disclosure of Invention The technical problem to be solved by the invention is as follows: the high-performance high-speed train brake pad material is prepared by utilizing the excellent mechanical and heat conduction properties of graphene and compounding with a metal matrix to further enhance the strength, wear resistance and high temperature resistance of the material. According to the invention, the chemical activity of graphene oxide and the matrix metal powder are firstly subjected to mechanical alloying, so that the problems of dispersion and interface combination of graphene in a metal matrix are solved, and the metal matrix is reinforced; and then, adding a lubricating component and a friction component, uniformly mixing, and then molding and sintering to prepare the high-performance graphene reinforced high-speed train brake pad material. The graphene reinforced high-speed train brake pad prepared by the invention has the characteristics of high strength, high temperature resistance and good wear resistance, and can completely meet the braking requirement of a high-speed train at the speed of 350Km/h or above. The invention is realized by the following technical scheme. A graphene reinforced high-speed train brake pad material, wherein: the lubricating base material comprises a base body component, a base body reinforcing component, a friction component and a lubricating component, wherein the sum of the mass percentage contents of the components is 100%; the base body component is copper powder, the copper powder is atomized copper powder or electrolytic copper powder, and the mass percentage content of the base body component is 45-70%; the matrix reinforcing component consists of graphene and iron powder or consists of graphene oxide and iron powder, wherein the iron powder is reduced iron powder, the mass percent of the iron powder is 3-20%, and the mass percent of the graphene or graphene oxide is 0.2-2%; the friction component consists of chromium oxide powder and zirconium oxide powder, and the mass percentage content of the friction component is 6-15%; the lubricating component consists of graphite and molybdenum disulfide, and the mass percentage content of the lubricating component is 5-18%. A preparation method of a graphene reinforced high-speed train brake pad material comprises the following steps: s1, weighing copper powder and graphene or graphene oxide according to the mass percentage, putting the weighed raw materials into a vacuum ball-milling tank for ball-milling for 5-15 minutes, and uniformly mixing the graphene into matrix components through mechanical alloying; and S2, adding a friction component and a lubricating component into the raw materials subjected to ball milling in the step S1 according to the mass percentage, mixing, molding and sintering to obtain the material for the graphene reinforced high-speed train brake pad, wherein the compression molding pressure is 300-500 MPa, the sintering temperature is 900-1000 ℃, the constant temperature time is 1-4 hours, and the protective gas is hydrogen. Compared with the prior art, the invention has the beneficial effects that: the graphene reinforced high-speed train brake pad material prepared by the invention has the characteristics of high strength, high temperature resistance and good wear resistance, and can completely meet the braking requirement of high-speed trains with the speed of 350Km/h an