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A pre-diffusion bonded powder for powder metallurgy, its manufacturing method, and a method of using the powder to manufacture oil-impregnated bearings

A powder metallurgy and pre-diffusion technology, which is applied in the field of powder metallurgy pre-diffusion combined with powder and its manufacturing, can solve the problem of not being able to meet the further development of the industry, and achieve the effect of small size change and accurate size

Active Publication Date: 2017-07-11
ZHEJIANG HENGLI POWDER METALLURGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The crushing strength of oil-impregnated bearings made of powder prepared by the existing diffusion method generally does not exceed 300 MPa, which cannot meet the needs of further industrial development

Method used

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  • A pre-diffusion bonded powder for powder metallurgy, its manufacturing method, and a method of using the powder to manufacture oil-impregnated bearings
  • A pre-diffusion bonded powder for powder metallurgy, its manufacturing method, and a method of using the powder to manufacture oil-impregnated bearings
  • A pre-diffusion bonded powder for powder metallurgy, its manufacturing method, and a method of using the powder to manufacture oil-impregnated bearings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A pre-diffusion bonded powder for powder metallurgy, comprising the following raw materials by weight percentage: Cu18-20%, Sn3-5%, Mo0.5-1%, Ni1.5-2%, C1.5-2 %, the balance is Fe.

[0026] Particularly preferably, it contains the following raw materials by weight percentage: 19.2% Cu, 3.8% Sn, 0.78% Mo, 1.7% Ni, 1.8% Cl, and the balance is Fe.

[0027] Particularly preferably, Cu, Sn, Mo, Ni, C and Fe are all in the form of powder, and the particle size is not more than 10 μm.

[0028] Particularly preferably, it also includes 0.5-1% binder to prevent the segregation of the pre-diffusion bonded powder during transportation or processing, and can also improve chemical and physical stability, and can keep the particles bonded for a long time without hardening, And it can be easily burned during the sintering operation.

[0029] Particularly preferably, the binder is polyglycerol, polyglycerol is a polyhydric alcohol in which the hydroxyl groups between two or more glyc...

Embodiment 2

[0031] A method for manufacturing pre-diffusion bonded powder for powder metallurgy, comprising the following steps:

[0032] Step 1, mix the Ni, Mo and Fe of formula quantity evenly, in the non-oxidizing atmosphere of 900-980 ℃ or vacuum (vacuum degree is less than 10 -3 MPa) to heat the mixed powder for 30-50min to realize the pre-diffusion combination of alloy elements Ni, Mo and Fe matrix to form a weakly sintered cake; through the pre-diffusion alloying process, the alloy phase is evenly distributed in fine particles in the material , which plays the role of alloy strengthening and dispersion strengthening, so that the material has higher strength properties. At the same time, due to the spheroidization of pores, the source of cracks in the sintered body is reduced, and the strength of the sintered body is correspondingly improved; the diffusion temperature is low, and the sintering When the neck grows, the particle structure becomes irregular, the bulk density decreases,...

Embodiment 3

[0037] 7. A method for manufacturing oil-impregnated bearings using pre-diffusion bonded powders for powder metallurgy, comprising the following steps:

[0038] Step 1. When the mold is pressed, the pre-diffusion bonded powder is filled in one time, and is pressed into the mold with a pressure of 490-510MPa;

[0039] Step 2. During sintering, adopt the sintering method of gradually increasing the temperature in different zones, which are divided into five zones, the maximum temperature does not exceed 1085°C, the sintering time is 55-65min, the cooling method is natural cooling by water circulation, and the entire cooling process takes about 10 hours;

[0040] Step 3, heat treatment, the overall C penetration heat treatment is adopted, and the hardness is controlled above HRB70; after the overall C penetration heat treatment, the radial crushing strength of the oil-impregnated bearing is ≥ 480 MPa, and the axial compressive strength is ≥ 510 MPa

[0041] Step 4, cutting proces...

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Abstract

The invention discloses pre-diffusion bonding powder for powder metallurgy, a manufacturing method thereof and method for manufacturing an oil bearing through the pre-diffusion bonding powder. The raw material of the pre-diffusion bonding powder comprises, by weight, 18%-20% of Cu, 3%-5% of Sn, 0.5%-1% of Mo, 1.5%-2% of Ni, 1.5%-2% of C and the balance Fe. The pre-diffusion bonding powder manufactured through a peculiar formula and the manufacturing method not only forms adequate metallurgical bonding with Fe powder but also has no obvious influence on the compressibility of the Fe powder. The invention further provides the method for manufacturing the oil bearing through the pre-diffusion bonding powder. The bearing is precise in dimension, the dimensional change is small during sintering, and the radial crushing strength of the bearing is no less than 480 MPa and much higher than that of a powder metallurgy bearing manufactured through a traditional process.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy, in particular to a pre-diffusion bonding powder used in powder metallurgy, a manufacturing method thereof, and a method for manufacturing oil-impregnated bearings using the powder. Background technique [0002] There are many ways to prepare alloy powder, such as mixing method, atomization method and diffusion method. The powder prepared by the mixing method is prone to segregation during placement or transportation. The powder prepared by the atomization method is completely alloyed and basically free of segregation. , but the powder formability and compressibility are poor, and the powder prepared by the diffusion method combines the advantages of formability and consistency of elemental metal powder and alloy powder, and is easy to operate, and has been widely used in the field of powder metallurgy. Oil-impregnated bearings are sliding bearings made of porous materials with lubricati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/16C22C38/12C22C38/08B22F3/02B22F3/10B22F1/00B22F5/00
CPCB22F1/0003B22F3/02B22F3/10B22F5/00C22C38/008C22C38/08C22C38/12C22C38/16
Inventor 何启华严超群
Owner ZHEJIANG HENGLI POWDER METALLURGY CO LTD
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