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High-strength antifriction lead-free copper-based sliding bearing material

A sliding bearing, copper-based technology, applied in the field of bearing materials, can solve the problems of poor interface bonding and poor wettability, and achieve the effects of excellent tribological performance, reduction of crack defects and simple process

Inactive Publication Date: 2018-07-13
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of air absorption, poor wettability, and poor interface bonding existing in the added reinforcing particles, and further improve the mechanical properties and friction and wear properties of copper-based sliding bearing materials, the invention provides a high-strength anti-friction lead-free copper-based sliding bearing material and its preparation method

Method used

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  • High-strength antifriction lead-free copper-based sliding bearing material
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  • High-strength antifriction lead-free copper-based sliding bearing material

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The specific operation steps for making high-strength anti-friction lead-free copper-based sliding bearing materials are as follows:

[0030] (1) Ball milling

[0031] Weigh 220.8g (92%) bronze powder, 9.6g (4%) copper sulfide and 9.6g (4%) iron powder, 240g in total; put 240g materials into four grinding tanks with a volume of 200mL; The total mass of ground canned powder is 60g, and the process control agent carbon tetrachloride is added according to the mass of the mixed material to be ground at 0.5wt%. Bronze powder, copper sulfide powder, iron powder and the process control agent form the mixed material to be ground.

[0032]

[0033] The mass percentage composition of bronze powder is shown in Table 1.

[0034] 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.

[0035] Vacuumize, fill with high-purity argon,...

Embodiment 2

[0043] The specific operation steps for making high-strength anti-friction lead-free copper-based sliding bearing materials are as follows:

[0044] (1) Ball milling

[0045] Weigh and weigh 134.4g (84%) bronze powder, 12.8g (8%) copper sulfide and 12.8g (8%) iron powder respectively, a total of 160g; put 160g of materials into four grinding tanks with a volume of 200mL The total mass of single grinding canned powder is 40g, and the process control agent stearic acid is added by 0.5wt% of the mass of the mixed material to be ground; bronze powder, copper sulfide powder, iron powder and process control agent form the mixed material to be ground.

[0046]

[0047] The mass percentage composition of bronze powder is shown in Table 2.

[0048] The mass ratio of grinding balls to the mixed material to be ground is 15:1, and the total mass of grinding balls in a single grinding tank is 600g, including 250g of large balls and 350g of small balls.

[0049] Vacuumize, fill with hi...

Embodiment 3

[0057] The high-strength anti-friction lead-free copper-based sliding bearing material in this embodiment is made of 76% by mass of bronze powder, 12% of copper sulfide powder and 12% of iron powder.

[0058] Others are with embodiment 1.

[0059] 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 a high-strength antifriction lead-free copper-based sliding bearing material. A ball milling process is adopted to enable copper powder, iron powder and copper sulphide powderto be mechanically alloyed, and CuS and Fe mixed powder can generate superfine particle nanocrystalline FeS in a high-energy guide-in manner through a mechanically induced chemical reaction. The reaction in situ composite process is used for solving the problems that enhanced particles are added externally, air suction and wettability are poor, and the interface combination is poor; meanwhile, through the ball milling process, the phenomenon that when ferrous sulfide is directly added, agglomeration is easily caused is avoided; in the ball milling process, the other part of Fe atoms is added into copper atoms in a solid solution manner so as to achieve the solid solution reinforcing effect, and the copper base composite is reinforced. The antifriction and anti-sticking capacity of FeS is mainly used for replacing lead in the original copper base bearing material, lead pollution is avoided, meanwhile, through Fe solid solution, the copper-based sliding bearing material is reinforced, and effective unifying of high strength and good lubricating characteristics of the lead-free copper-based sliding bearing material is achieved.

Description

technical field [0001] The invention belongs to the technical field of bearing materials, and in particular relates to a high-strength anti-friction 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] Ferrous sulfide (FeS) in sulfide is a common solid lubricant, which has a hexagonal layered structure similar to graphite, has low shear strength, and has a melting point as high as 1100°C. The surface modification of auxiliary parts has been widely used. By directly adding FeS particles in the copper alloy matrix, the lead-free copper-based sliding bearin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/02C22C32/00C22C1/05B22F9/04
CPCC22C9/02B22F9/04B22F2009/043C22C1/053C22C32/0089
Inventor 尹延国张开源曾庆勤张国涛
Owner HEFEI UNIV OF TECH
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