Preparation method for Al2O3 dispersion strengthened copper-based oil bearing

A technology of dispersion strengthened copper and dispersed copper, which is applied in the field of powder metallurgy, can solve problems such as low strength, poor wear resistance, and poor precision, and achieve excellent strength, excellent mechanical properties, and small dimensional changes

Active Publication Date: 2017-10-24
GUANGDONG INST OF MATERIALS & PROCESSING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of aluminum bearing with high strength, good wear resistance and high precision aiming at the deficiencies such as low strength, poor wear resistance and poor precision generally existing in the existing bronze oil-impregnated bearings. 2 o 3 Preparation method of dispersion strengthened copper-based oil-impregnated bearing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: 0.3wt%Al 2 o 3 Preparation of dispersion-strengthened copper-based oil-impregnated bearings

[0016] -150 micron dispersed copper alloy powder prepared by internal oxidation method (containing 0.3wt% Al 2 o 3 ) and commercially available -45 micron tin powder as raw materials, according to the mass ratio of dispersed copper alloy powder: tin powder = 91:9 to mix evenly, the mixed powder is subjected to 400 ℃, 6h diffusion alloying treatment in hydrogen, after crushing , sieve, and then mix the sieved powders with particle sizes of +150 microns, -150 microns to +75 microns, -75 microns to +45 microns and -45 microns in proportions of 3%, balance, 30% and 30%, A dispersed copper-tin diffusion alloyed powder is obtained. Use 100MPa forming pressure to mold the powder to prepare the bearing green body with a density of 6.1g / cm 3 . The obtained bearing green body was sintered in hydrogen at 800°C for 1 hour. The sintered billet is finished and vacuum-immers...

Embodiment 2

[0017] Example 2: 1wt%Al 2 o 3 Preparation of dispersion-strengthened copper-based oil-impregnated bearings

[0018] -150 micron dispersed copper alloy powder prepared by internal oxidation method (containing 1wt% Al 2 o 3 ) and commercially available -45 micron tin powder as raw materials, according to the mass ratio of dispersed copper alloy powder: tin powder = 90:10 to mix evenly, the mixed powder was subjected to 600 ℃, 4h diffusion alloying treatment in hydrogen, after crushing , sieve, and then mix the sieved powders with particle sizes of +150 microns, -150 microns to +75 microns, -75 microns to +45 microns and -45 microns in proportions of 5%, balance, 20% and 20%, A dispersed copper-tin diffusion alloyed powder is obtained. Using 200MPa forming pressure molding powder to prepare bearing green body, the density is 6.4g / cm 3 . The obtained bearing green body was sintered in hydrogen at 850°C for 2 hours. The sintered billet is finished and vacuum-immersed in oil...

Embodiment 3

[0019] Example 3: 2wt%Al 2 o 3 Preparation of dispersion-strengthened copper-based oil-impregnated bearings

[0020] -150 micron dispersed copper alloy powder prepared by internal oxidation method (containing 2wt% Al 2 o 3 ) and commercially available -45 micron tin powder as raw materials, according to the mass ratio of dispersed copper alloy powder: tin powder = 89:11 to mix evenly, the mixed powder is subjected to 700 ℃, 3h diffusion alloying treatment in hydrogen, after crushing , sieve, and then mix the sieved powders with particle sizes of +150 microns, -150 microns to +75 microns, -75 microns to +45 microns and -45 microns in proportions of 3%, balance, 30% and 30%, A dispersed copper-tin diffusion alloyed powder is obtained. Use 300MPa forming pressure to mold the powder to prepare the bearing green body with a density of 6.3g / cm 3 . The obtained bearing green body was sintered in hydrogen at 900°C for 3 hours. The sintered billet is finished and vacuum-immersed...

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Abstract

A preparation method for an Al2O3 dispersion strengthened copper-based oil bearing comprises the steps that Al2O3 dispersion copper alloy powder and tin powder are mixed proportionally and evenly; mixed powder is subjected to diffusion alloying treatment, and Al2O3 dispersion strengthened copper-tin diffusion alloying powder is obtained after crushing, screening and blending; the obtained diffusion alloying powder is subjected to die forming, and a bearing green body is prepared; and the obtained bearing green body is sintered and then subjected to oil immersion and finishing, and the Al2O3 dispersion strengthened copper-based oil bearing is obtained. The dispersion strengthened copper-based oil bearing prepared through the method has the good strength, hardness and precision, the defects that existing bronze oil bearings are low in strength, poor in abrasion resistance, low in precision and the like commonly are overcome, and the method is suitable for scale production.

Description

technical field [0001] The invention relates to a preparation method of a copper-based oil-impregnated bearing, in particular to an Al 2 o 3 The invention discloses a method for preparing a dispersion-strengthened copper-based oil bearing, which belongs to the technical field of powder metallurgy. Background technique [0002] Bearings are the basis of transmission and an indispensable component in the machinery industry. Where there is machinery, there is rotation; where there is rotation, bearings are needed. Oil-impregnated bearings mainly include iron-based and copper-based. Among them, sintered bronze (Cu-Sn) oil-impregnated bearings have excellent corrosion resistance and mechanical properties, high thermal conductivity, and long service life. They have been widely used in aerospace , automobiles, electronic equipment, office equipment and precision machinery and other fields. According to statistics, more than 55% of the world's copper powder is used to make oil-i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F5/10B22F3/10B22F3/26B22F1/00
CPCB22F1/0003B22F3/1007B22F3/26B22F5/106B22F2201/013
Inventor 闫志巧陈峰汪涛
Owner GUANGDONG INST OF MATERIALS & PROCESSING
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