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A high-strength lead-free copper-based sliding material and its preparation method

A lead-copper, high-strength technology, applied in the field of bearing materials, can solve the problems of weakening the overall mechanical properties of the material, poor interfacial bonding quality, and agglomeration of ferrous sulfide, etc., to broaden the application, improve the interface bonding ability, and improve the effect of easy agglomeration.

Active Publication Date: 2018-01-26
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ferrous sulfide (FeS) has poor compatibility with the copper alloy matrix. When its content is high, ferrous sulfide (FeS) is prone to agglomeration, and pores are likely to be formed at the junction with the matrix, and the interface bonding quality is poor, weakening the overall material. mechanical properties

Method used

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  • A high-strength lead-free copper-based sliding material and its preparation method
  • A high-strength lead-free copper-based sliding material and its preparation method
  • A high-strength lead-free copper-based sliding material and its preparation method

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Experimental program
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Effect test

Embodiment example

[0020] This implementation case is implemented according to the following steps:

[0021] 1. Weigh 7.2g of ferrous sulfide powder and 232.8g of bronze powder, 240g in total, wherein the bronze powder is weighed according to Table 1 according to the mass percentage. Put 240g into four ball milling tanks, the total mass of powder in a single ball tank is 60g, add 1wt% ethanol, add stainless steel grinding balls, including 250g of large balls and 350g of small balls, vacuumize, fill with argon with a purity of 99.999%, and rotate at a speed of 250r / min, ball milling time 30h. After ball milling, cool naturally to obtain 240g mechanical alloy powder;

[0022] Table 1 Composition of Bronze Powder

[0023] Element

nickel

tin

phosphorus

iron

copper

mass percentage

1

8

0.5

1

89.5

[0024] The mass percentage composition of bronze powder is shown in Table 1.

[0025] 2. Add 0.5wt% zinc stearate as a lubricant in 240g of mecha...

Embodiment 2

[0033] 1. Weigh 14.4g of ferrous sulfide powder and 225.6g of bronze powder, 240g in total, wherein the bronze powder is weighed according to Table 3 according to the mass percentage. Put 240g into four ball milling tanks, the total mass of powder in a single ball tank is 60g, add 1wt% stearic acid, add stainless steel grinding balls, including 250g of large balls and 350g of small balls, vacuumize, fill with argon gas with a purity of 99.999%, and rotate at a speed of 250r / min, ball milling time 25h. After ball milling, cool naturally to obtain 240g mechanical alloy powder;

[0034] Table 3 Composition of Bronze Powder

[0035] Element

nickel

tin

phosphorus

iron

copper

weight percentage

1

6.5

0.3

1

91..2

[0036] The mass percentage composition of bronze powder is shown in Table 3.

[0037] 2. Add 0.5wt% zinc stearate as a lubricant in 240g of mechanical alloy powder, and press out friction and wear test samples with ...

Embodiment 3

[0043] 1. Weigh 21.6g of ferrous sulfide powder and 218.4g of bronze powder, 240g in total, wherein the bronze powder is weighed according to Table 5 according to the mass percentage. Put 240g into four ball milling tanks, the total mass of powder in a single ball tank is 60g, add 1wt% stearic acid, add stainless steel grinding balls, including 300g of large balls and 300g of small balls, vacuumize, fill with argon gas with a purity of 99.999%, and rotate at a speed of 300r / min, ball milling time 20h. After ball milling, cool naturally to obtain 240g mechanical alloy powder.

[0044] Table 5 Composition of Bronze Powder

[0045] Element

nickel

tin

phosphorus

iron

copper

mass percentage

2

7

0.5

2

88.5

[0046] The mass percentage composition of bronze powder is shown in Table 5.

[0047] 2. Add 0.5wt% zinc stearate as a lubricant in 240g of mechanical alloy powder, and press out friction and wear test samples with a siz...

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Abstract

The invention discloses a high-strength lead-free copper-base sliding bearing material and a preparing method thereof. FeS powder and bronze powder are mechanically alloyed through the ball milling technology, the interface bonding capability between FeS and copper is improved, FeS particles are evenly distributed in a copper base body, the defect that aggregating is likely to happen when the content of the FeS is high is overcome, the dispersion strengthening function of FeS can be brought into play, and the material mechanical performance is improved. According to the high-strength lead-free copper-base sliding bearing material and the preparing method thereof, the good solid self-lubricating capability of FeS is mainly utilized, the friction and abrasion performance of the lead-free copper-base sliding bearing material is improved, effective unification between the high strength and the good lubricating character of the copper-base sliding bearing material is achieved, and application of the lead-free copper-base bearing material under complex work conditions is widened.

Description

technical field [0001] The invention belongs to the technical field of bearing materials, and in particular relates to a 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, ferrous sulfide (FeS) has low shear strength and is widely used in copper-based sliding bearing materials. However, ferrous sulfide (FeS) has poor compatibility with the copper alloy matrix. When its content is high, ferrous sulfide (FeS) is prone to agglomeration, and pores are likely to be formed at the junction with the matrix, and the interface bonding qualit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/00C22C1/05B22F1/00
CPCB22F1/0003C22C1/05C22C9/00
Inventor 尹延国曾庆勤张国涛田明
Owner HEFEI UNIV OF TECH
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