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Antifriction lead-free copper-based sliding bearing material and preparation method thereof

A sliding bearing, copper-based technology, applied in the direction of bearings, bearing components, shafts and bearings, etc., can solve the problems of poor interface bonding, achieve the effects of improving friction reduction and anti-adhesion, improving friction and wear performance, and reducing crack defects

Inactive Publication Date: 2018-09-04
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Use the good synergistic effect of ferrous sulfide and bismuth to replace lead as a lubricant in copper-based bearing materials, use high-energy ball milling technology to improve the uniform dispersion of ferrous sulfide powder and bismuth powder in bronze powder, and firmly combine with copper matrix , solve the problems of agglomeration and poor interfacial bonding when the content of ferrous sulfide is high, and improve the strength and anti-friction performance of the material

Method used

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  • Antifriction lead-free copper-based sliding bearing material and preparation method thereof
  • Antifriction lead-free copper-based sliding bearing material and preparation method thereof
  • Antifriction lead-free copper-based sliding bearing material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] The specific preparation operation steps of a friction-reducing lead-free copper-based sliding bearing material are as follows:

[0028] (1) Ball milling

[0029] Weigh 220.8g (92%) bronze powder, 14.4g (6%) ferrous sulfide powder and 4.8g (2%) bismuth powder, 240g in total; put 240g of materials into four grinding tanks with a volume of 200mL The total mass of a single grinding canned powder is 60g, and the process control agent stearic acid is added by 0.5wt% of the mass of the mixed material to be ground; bronze powder, ferrous sulfide powder, bismuth powder and process control agent form the mixed material to be ground.

[0030]

[0031] The mass percentage composition of bronze powder is shown in Table 1.

[0032] The mass ratio of grinding balls to the mixed material to be ground is 10:1, and the total mass of grinding balls in a single grinding tank is 600g, including 250g of large balls and 350g of small balls.

[0033] Vacuumize, fill with high-purity argo...

Embodiment 2

[0041] The specific preparation operation steps of a friction-reducing lead-free copper-based sliding bearing material are as follows:

[0042] (1) Ball milling

[0043] Weigh 276g (92%) bronze powder, 18g (6%) ferrous sulfide powder and 6g (2%) bismuth powder, 300g in total. Put 300g of material into four grinding tanks with a volume of 200mL respectively; the total mass of powder in a single grinding tank is 75g, and add the process control agent stearic acid according to the mass of the mixed material to be ground at 0.5wt%; bronze powder and ferrous sulfide powder , bismuth powder and process control agent to form the mixed material to be ground.

[0044]

[0045] The mass percentage composition of bronze powder is shown in Table 2.

[0046] The mass ratio of grinding balls to the mixed material to be ground is 8:1, and the total mass of grinding balls in a single grinding tank is 600g, including 250g of large balls and 350g of small balls.

[0047] Vacuumize, fill w...

Embodiment 3

[0055] In this embodiment, the ball milling process control agent is ethanol.

[0056] Others are with embodiment 1.

[0057] The mechanical properties of the sample obtained in this embodiment and the test results of the tribological properties after 30 minutes of the test are shown in Table 3.

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Abstract

The invention discloses an antifriction lead-free copper-based sliding bearing material and a preparation method thereof. The ferrous sulfide powder, the bismuth powder and the bronze powder are subjected to mechanical alloying by adopting a ball milling technology to improve the interface adhesive strength of the ferrous sulfide, the bismuth and the bronze, and the phenomenon that the ferrous sulfide is easy to agglomerate when the content of copper matrix is relatively high is improved, the structure of FeS is good in oil storage capacity, the stability of the liquid-solid lubricating film is enabled to be good, so that the process of Bi spalling, the fusion of the low-melting-point component Bi and separating out of the low-melting-point component Bi are relieved, and the liquid-solid lubricating film can also be repaired and completed, so that the antifriction performance of the material is improved; in conclusion, the antifriction and wear-resistant properties of the copper-basedsliding bearing material are improved, the lead which is used as a lubricant in the copper-based bearing material is replaced by the good synergistic effect of the ferrous sulfide and the bismuth, sothat the pollution of lead is avoided; and the antifriction lead-free copper-based sliding bearing material and the preparation method thereof have the advantages of being low in cost and suitable forindustrial production.

Description

technical field [0001] The invention relates to a sliding bearing material, in particular to a friction-reducing lead-free copper-based sliding bearing material and a preparation method thereof. Background technique [0002] Because lead has the characteristics of soft quality and low melting point, it is widely used in copper-based sliding bearing materials. At the same time, lead is also a heavy metal, which has serious harm to human body and environment. At present, developed countries such as Europe and the United States have imposed strict restrictions on the use of lead. [0003] As a common solid self-lubricating material, bismuth is a soft low-melting point substance that is incompatible with alloys such as Cu and Al. As a soft phase, it basically exists in alloys such as Cu and Al in a free state. The application is more extensive. However, due to the brittleness of Bi, the Bi-rich phase on the precipitated friction surface is easy to peel off, resulting in a decr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/00C22C32/00C22C1/05F16C33/62
CPCC22C9/00C22C1/05C22C32/0089F16C33/62F16C2204/10
Inventor 尹延国张开源曾庆勤张国涛
Owner HEFEI UNIV OF TECH
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