Method for regulating and controlling friction coefficient of copper-graphite composite material through graphite flake orientation
A composite material and friction coefficient technology, applied in the field of friction composite materials, can solve problems such as low lubricity, strong grinding effect, and low degree of graphitization of artificial graphite particles
Active Publication Date: 2021-12-10
XI AN JIAOTONG UNIV
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Problems solved by technology
On the one hand, the degree of graphitization of artificial graphite particles is low, which is not conducive to the full play of the electrical conductivity of the composite material; on the other hand, artificial graphite particles are brittle, have high porosity, strong grinding effect, and low lubricity, which often lead to high wear and tear. rate and friction fluctuations
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[0017] The present invention is described in detail below in conjunction with accompanying drawing.
[0018] A method for adjusting and controlling the friction coefficient of copper-graphite composite material through graphite flake orientation, comprising the steps of:
[0019] Step 1: Place the graphite flakes in 0.2-0.6mol / L dilute hydrochloric acid, and stir in a constant temperature water bath at 60-80°C for 2-40min, and after centrifugal cleaning to neutrality, dry in a vacuum oven for 20-40h;
[0020] Step 2: Weigh 50-70% of the graphite sheet treated in step 1, 30-50% of copper powder, 1-5% of chromium powder, 2-10% of tin powder by volume percentage, and place the mixed powder in a drum In the mixer, mix for 4-6 hours;
[0021] Step 3: Take an appropriate amount of the mixed powder in step 2 and put it into a graphite mold, pre-press molding, the pressing force is 15-30MPa, hold the pressure for 30-60s, and then put the green body in the sintering furnace at 8-10℃ ...
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Abstract
The invention discloses a method for regulating and controlling the friction coefficient of a copper-graphite composite material through graphite flake orientation. According to the method, natural graphite flakes, trace alloy elements including chromium and tin and superfine copper powder are adopted, the graphite flakes are directionally arranged through the hot pressing process, and a sintered body of a layered structure is obtained; the copper-graphite composite material with a specific angle between the graphite flakes and the contact surface can be obtained through fine cutting of the sintered body at a specific angle, and the mechanical and physical characteristics, including the friction coefficient, the wear rate and the conductivity, of the composite material on the friction contact surface can be changed through changing of the included angle between the graphite flakes and the sliding surface; the composite material has the advantages of low friction coefficient, small wear rate and good conductivity, and the antagonism phenomenon between the lubrication and conductivity of the lamellar graphite can be effectively relieved.
Description
technical field [0001] The invention relates to the field of friction composite materials, in particular to a method for regulating the friction coefficient of copper-graphite composite materials through the orientation of graphite flakes. Background technique [0002] As a key component of an electric locomotive, the pantograph slide is required to deliver stable current to the locomotive in sliding contact with the wire. Therefore, the pantograph slide material needs to have good electrical conductivity, wear resistance, high mechanical strength and low friction coefficient. Conventional pantograph slider materials mainly include: copper-based powder metallurgy sliders, pure carbon sliders, and metal-impregnated carbon sliders, all of which have some shortcomings. Copper-based powder metallurgy slide plate has high hardness, good strength, electrical conductivity and wear resistance, but the hard components contained in it often cause serious wear to catenary wires, and h...
Claims
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IPC IPC(8): B22F1/00B22F3/14
CPCB22F3/14
Inventor杨建锋侯宝强智强史卓涛王劲枭王波王继平肖志超
OwnerXI AN JIAOTONG UNIV