Powder metallurgy iron copper-based oiliness antifriction material containing rare earth oxides and preparing method

A rare earth oxide and powder metallurgy technology, which is applied in the field of powder metallurgy iron-copper-based oil-containing anti-friction materials containing rare earth oxides and its preparation, which can solve the problem of reducing the load bearing and service life of materials, damaging the mechanical properties of the matrix, and the mechanical properties of alloy powder. Low problems, to achieve the effects of improved mechanical properties, low operating noise, and superior wear resistance

Active Publication Date: 2014-01-22
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Powder metallurgy iron-copper-based oil-containing anti-friction materials have the characteristics of both copper-based and iron-based oil-containing anti-friction materials, and have the advantages of good wear resistance, high bearing capacity, and corrosion resistance. Usually more than 8% of the solid solubility of copper in iron) excellent corrosion resistance, running-in performance, and relatively low running noise, but excessive copper content will damage the mechanical properties of the matrix, thereby reducing the load bearing and service life of the material. This restricts the application of such iron-copper-based oil-containing antifriction materials with high copper content in a wider range
In the field of powder metallurgy, due to the differences in the properties of various powders such as bulk density, flow rate and morphology, it is always a difficult problem to mix various powders uniformly; alloy powder can solve the problem of powder segregation to a certain extent , but the price of alloy powder is relatively high, and its pressing performance is relatively poor. The advantage of single-quality powder lies in its low price, outstanding pressing performance, and free adjustment of components. The problem of uneven structure, and the mechanical properties are relatively low compared to the pre-diffused alloy powder

Method used

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  • Powder metallurgy iron copper-based oiliness antifriction material containing rare earth oxides and preparing method
  • Powder metallurgy iron copper-based oiliness antifriction material containing rare earth oxides and preparing method
  • Powder metallurgy iron copper-based oiliness antifriction material containing rare earth oxides and preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] According to the composition ratio described in claim 1, weigh 691g reduced iron powder, 300g mixed copper powder, 6g tin powder, 7g zinc stearate, 3gCeO 2 . Mix the above powder in a V-type mixer for 1 hour; then place the uniformly mixed powder in a mold, and press it into a cylindrical shape under a pressure of 300-600MPa (outer diameter×inner diameter×height=9.2×4.9×6.5 mm) and block (length × width × height = 18 × 12 × 5mm), the density of the compact is 6.05 ~ 6.15g / cm 3 ; The above-mentioned compact is sintered in a mesh belt sintering furnace, and the sintering atmosphere is N 2 and H 2 In a reducing atmosphere, the sintering temperature is 1000-1040°C; during the sintering process, the compact first passes through a preheating zone at 500-600°C for 1-2 hours, and then enters a sintering zone at 1000-1040°C for 1.5 ~2.5h, and finally cooled to room temperature through a cooling zone to obtain a sintered body, the cooling time is 1~1.5h;

[0040] Press and re...

Embodiment 2

[0042] The preparation method is the same as example 1, but the composition ratio changes, and the raw materials are composed as follows: 688g reduced iron powder, 300g mixed copper powder, 6g tin powder, 7g zinc stearate, 6gCeO 2 .

Embodiment 3

[0044] The preparation method is the same as example 1, but the composition distribution ratio changes, and the raw materials are composed as follows: 685g reduced iron powder, 300g mixed copper powder, 6g tin powder, 7g zinc stearate, 9gCeO 2 .

[0045] Table 1

[0046] serial number

CeO 2 (wt.%)

Crushing strength (MPa)

Hardness (HB)

Oil content (%)

1#

0

270

38.9

18.8

2#

0.3

285

40.5

19.0

3#

0.6

295

41.0

19.1

4#

0.9

268

40.3

18.5

5#

1.2

266

38.0

18.6

[0047] Table 1 lists CeO 2 Mechanical properties and oil content of iron-copper-based oil-containing antifriction materials with different contents. Use YA-10 material testing machine and HBRVU-1875 Blowy hardness tester to measure the radial crushing strength and apparent hardness of cylindrical oily antifriction materials; Determination of porosity—GB / T5163-2006 / ISO2738:1999)...

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Abstract

The invention provides a powder metallurgy iron copper-based oiliness antifriction material containing rare earth oxides and a preparing method. The oiliness antifriction material comprises, by mass, 67.0%-71.0% of Fe, 27.2%-32.1% of Cu, 0.6% of Sn, 0.3%-1.2% of CeO2, 0.7% of zinc stearate and the balance unavoidable impurities. The oil content of the oiliness antifriction material is 17%-22% by volume. Powder which is uniformly mixed undergoes pressing, sintering, finishing, oil immersion and other work procedures, and the powder metallurgy iron copper-based oiliness antifriction material containing the rare earth oxides is obtained. Compared with a base material, when the antifriction material contains 0.6% of CeO2 by mass, the mechanical performance including crushing strength and hardness is improved in a certain degree, the antifriction performance is greatly improved, and the friction loss is nearly reduced by 40%. The oiliness antifriction material has the advantages that the wear-resistant performance of the material is greatly improved due to the CeO2 in proper amount, service life of the material is prolonged, the copper content is high, the friction coefficient is low, the anti-corrosion performance is excellent, the raw material is mixed powder of iron powder and copper powder, price is low, and the material contains no lead and meets requirements of environment protection.

Description

technical field [0001] The invention relates to a rare earth oxide-containing powder metallurgy iron-copper-based oil-containing anti-friction material and a preparation method. This oil-containing anti-friction material can be applied to the fields of automobiles, electric tools, and household appliances, and is mainly used for rotating and supporting motor shafts or Similar to mechanical parts,. Background technique [0002] Sintered oil-containing antifriction material is a self-lubricating material that can provide lubricating oil by itself during operation. The lubricating oil is mainly stored in the pores inside the material. In addition to the characteristic of self-lubrication, oil-containing anti-friction materials also have the advantages of good wear resistance and low noise, so they have become a basic part of many mechanical equipment, such as supporting parts such as air conditioners, car wipers, and electric tools. Oil-containing anti-friction materials are n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/16
Inventor 潘冶秦清华申承秀王春官
Owner SOUTHEAST UNIV
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