High wear resistant/friction reducing tin bronze base composite material

A copper-based composite material and technology of composite materials, applied in the field of copper-based composite materials, can solve the problems of carbon fiber friction reduction performance deterioration and other problems, and achieve the effects of excellent friction reduction performance, high electrical conductivity and thermal conductivity, and improved dispersibility.

Inactive Publication Date: 2003-06-25
ZHEJIANG UNIV
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  • Abstract
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Problems solved by technology

However, in environments such as vacuum, the anti-friction performance of carbon fiber deteriorates sharply

Method used

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Embodiment

[0008] The composite composition contains (by weight) 2.1% multi-walled carbon nanotubes, 0.3% TiB 2 , and the rest are Cu-Sn alloys containing 9.5% Sn. Cu-Sn alloy powder, ball milling-nickel-coated multi-walled carbon nanotubes, TiB 2 Powder mixing, after ultrasonic vibration and mechanical stirring, nickel-coated multi-walled carbon nanotubes, TiB 2 The powder is uniformly dispersed in the Cu-Sn alloy powder. The uniformly mixed powder is pressed into shape at 750MPa, sintered in an atmosphere of decomposed ammonia at 800°C, and is prepared into a composite material as the furnace cools down. Table 1 shows the mechanical, electrical and thermal properties of the composite material of the present invention at room temperature (20°C). Table 1 Compressive strength Tensile strength Elongation Impact toughness Hardness Dry friction coefficient Thermal conductivity σ bc (MPa) σ b (MPa) δ(%) (J / cm 2 ) (HB) (GCr15 steel grinding) (J / SM·℃) 540 130 ≥2 ≥45 55 0.07-0.15 48

[00...

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Abstract

The present invention relates to one copper-base composite material comprising multiple wall carbon nanotube 0.2-4.5 wt%, TiB2 0.1-1.3 wt%, except Cu-Sn alloy containing Sn in 0.35-12.0 wt%. It has excellent wear resistance, low friction coifficient, relatively high compression and tensile strength, moderate hardness, excellent electric conductivity and heat conductivity. It may be used in productino transmission bush, current collecting slid board for electric train and electric contact material.

Description

technical field [0001] The invention belongs to copper-based composite materials. Background technique [0002] Traditional C / Cu composites have been used as sliding materials and electrical contact materials due to the combination of high specific strength and specific modulus of carbon fibers, low axial thermal expansion coefficient, good anti-friction and wear resistance, and thermal conductivity. However, in environments such as vacuum, the anti-friction performance of carbon fiber deteriorates sharply. Carbon nanotubes (CNTs) are one-dimensional nanomaterials composed of stable C-C covalent bonds, which have super strong mechanical properties. Theoretical research shows that the average Young's modulus of multi-walled carbon nanotubes is 1.8TPa, and the average bending strength is as high as 14.2GPa; the tensile strength of carbon nanotubes is 100 times that of steel, and the specific gravity is only 1 / 6 of that of steel. Diamond is similar an...

Claims

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Application Information

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IPC IPC(8): C22C9/02
Inventor 涂江平王浪云杨友志张孝彬
Owner ZHEJIANG UNIV
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