Unleaded Cu-based sliding bearing material and preparation method thereof

A sliding bearing, lead-free copper-based technology, used in sliding contact bearings, rotating bearings, bearings, etc., can solve problems such as poor ductility, poor tribological properties of copper-bismuth bearing materials, and weak anti-friction and anti-adhesion properties. , to reduce the dosage, improve the adhesion, and improve the bonding strength of the interface

Inactive Publication Date: 2009-11-11
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The introduction of the metal element bismuth into the copper-based bearing material can also reduce friction and anti-adhesion. However, the hardness of bismuth is slightly higher than that of lead, and the ductility is also slightly worse than that of lead, so its anti-friction and anti-adhesion performance is weaker than that of lead. , so the tribological properties of copper-bismuth bearing materials are not as good as those of copper-lead bearing materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment 1, the present embodiment carries out the preparation of material according to the following steps:

[0047] 1. Use 200-mesh tin bronze pre-alloyed powder, add 200-mesh nickel powder, zinc powder, iron powder and bismuth powder and mix well;

[0048] 2. Fully dissolve the additive in water or ethanol solvent at a concentration of 2-25% by weight, and mix it with 300-mesh graphite powder with a composite coating on the surface;

[0049] 3. Fully mix the two powders in steps 1 and 2 and dry them, then repress and refire to obtain lead-free copper-based sliding bearing materials.

[0050] The specific chemical composition is shown in Table 1, the mechanical properties of the prepared lead-free copper-based bearing material are shown in Table 2, and the friction and wear properties are shown in Table 3. The wear test was carried out on the end face friction and wear testing machine, and the grinding material was Cr12 steel, and the pressure was 5Mpa. , the line ...

Embodiment 2

[0059] The material preparation method, performance testing method and conditions are the same as in Example 1, and the chemical composition of the lead-free copper-based bearing material is adjusted. The specific chemical composition is shown in Table 4, and the mechanical properties of the lead-free copper-based bearing material are shown in Table 5. The friction and wear properties of the bearings are shown in Table 6.

[0060] Table 4 Chemical composition of lead-free copper-based bearing materials

[0061] the element

[0062] Table 5 Mechanical properties of lead-free copper-based bearing materials

[0063] density

[0064] Table 6 Friction and wear properties of lead-free copper-based bearing materials

[0065] coefficient of friction

[0066] After 3 hours of friction and wear tests, it can be seen from Table 6 that the average friction coefficient of the friction pair under dry friction conditions is 0.23, the friction temperature rise...

Embodiment 3

[0068] The material preparation method, performance testing method and conditions are the same as in Examples 1 and 2, except that the composition of the lead-free copper-based bearing material is adjusted. The specific chemical composition is shown in Table 7, and the mechanical properties of the lead-free copper-based bearing material are shown in Table 8. , The friction and wear properties of lead-free copper-based bearings are shown in Table 9.

[0069] Table 7 Chemical composition of lead-free copper-based bearing materials

[0070] the element

[0071] Table 8 Mechanical properties of lead-free copper-based bearing materials

[0072] density

[0073] Table 9 Friction and wear properties of lead-free copper-based bearing materials

[0074] coefficient of friction

[0075] After 3 hours of friction and wear tests, it can be seen from Table 9 that the average friction coefficient of the friction pair under dry friction conditions is 0.21, th...

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Abstract

The invention relates to an unleaded Cu-based sliding bearing material and a preparation method thereof and the invention has the characteristics that: the material is composed of nickel, tin, zinc, iron, graphite, bismuth, copper and assistants, the substrate of the material is unleaded copper alloy, and the antifriction and antisticking constituent element is bismuth and graphite. The Cu-based bearing material features high intensity, and good antifriction and antisticking, thus realizing an unleaded Cu-based bearing material. The lead is cancelled in an original bearing material with lead and copper, and a synergistic effect of bismuth and graphite can replace the use of lead, thus completely overcoming the defect of lead pollution; moreover, the service performance of the bearing remains nearly the same, therefore the unleaded Cu-based sliding bearing material can completely replace the bearing material with lead and copper. The material of the invention can be applied in food machinery, drugs machinery, construction machinery, automobile and other products, and has advantages of good antifriction and antisticking, good heat dissipation effect, oxidation resistance and corrosive resistance.

Description

technical field [0001] The invention relates to a sliding bearing material, more specifically to a lead-free copper-based sliding bearing material and a preparation method thereof. Background technique [0002] Lead has the characteristics of soft and easy to deform, low melting point, and good boundary lubrication properties. It is widely used as an important component of copper-based sliding bearing materials. For example, Cu-10Sn-10Pb and Cu-3Sn-24Pb are the most common automotive engines. Sliding bearing materials, lead-containing copper-based sliding bearing materials have good properties such as anti-friction and anti-adhesion. However, lead and its compounds are highly toxic substances, and the use of lead-containing products will bring non-negligible harm to the human environment. For copper-based sliding bearing materials, how to maintain good anti-friction and anti-adhesion properties under lead-free conditions is particularly important. [0003] The soft phase g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16C17/00B22F3/12C23C18/32C23C18/38
Inventor 尹延国焦明华俞建卫解挺田明马少波
Owner HEFEI UNIV OF TECH
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