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Low density, high intensity and high performance powder metallurgy lining and preparation method thereof

A powder metallurgy, high-strength technology, applied in the field of powder metallurgy materials, can solve the problems of insufficient oil supply in the friction area, seizure of the shaft and the prayer sleeve, low oil content, etc., achieving good wear resistance, saving maintenance costs, and oil content. high effect

Inactive Publication Date: 2009-06-17
广东凯洋新材料有限公司
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Problems solved by technology

The powder metallurgy engineering machinery bushing produced by the traditional process has high strength, but the oil content is very low, which makes the oil supply in the friction zone insufficient, and the phenomenon of shaft and sleeve seizure often occurs, making the product life very short

Method used

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Embodiment Construction

[0012] Below in conjunction with embodiment the present invention is further described:

[0013] A low-density, high-strength high-performance powder metallurgy bushing, its chemical composition and weight percentage are: Cu: 0.5-5%, C: 0.5-2%, Ni: 0.3-1.5%, Mo: 0.5-1.5%, ZnS: 1-4%, the rest is Fe. The preparation method of the low-density, high-strength high-performance powder metallurgy bushing comprises the following steps:

[0014] (1) Mixed powder: According to the proportion of powder materials, Cu: 0.5-5%, C: 0.5-2%, Ni: 0.3-1.5%, Mo: 0.5-1.5%, ZnS: 1-4%, hard fatty zinc : 0.5%, and the rest is Fe for measurement. When mixing powder, first add half of Fe powder, then add Cu, C, Ni, Mo, ZnS and hard fatty zinc, and finally add the other half of Fe powder, and follow the above order Add the powder to the mixer and mix for at least 40 minutes;

[0015] (2) Pressing: Two-way pressing is used during pressing, the unit pressing pressure is 500-600MPa, and the density of th...

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Abstract

The invention relates to a high performance powder metallurgy bushing with low density and high strength, comprising the following chemical compositions by weight percent: Cu: 0.5-5%, C: 0.5-2%, Ni: 0.3-1.5%, Mo: 0.5- 1.5%, ZnS: 1-4% and the balance of Fe; the powder metallurgy procedure is applied with the following procedure: powder mixing-pressing-sintering-oil immersion-shaping to obtain finished products of bushing. The powder metallurgy engineering machine bushing product manufactured by the invention can bear high load in use, has bushing density as low as 5.8-6.5 g / cm<3>, high strength, a great deal of capillary porosities and 15-23% of oil content, and can remain excellent lubricity even on condition of bearing high load of 280kgf / cm<2>; the bushing has the advantages of low density, high strength, high oil content, great abrasion resistance and good self-lubricity, and is free of the phenomenon of clamping stagnation and burn and the like owing to excellent abrasion resistance of the product; in addition, service life of the bushing is up to over 10000h and maintenance cost is saved by 50%.

Description

【Technical field】 [0001] The invention belongs to the technical field of powder metallurgy materials, and relates to a low-density, high-strength high-performance powder metallurgy bushing used in engineering machinery such as bulldozers and excavators and a preparation method thereof. 【Background technique】 [0002] In the modern machinery manufacturing industry, bearing materials are an important class of mechanical structural materials. Among the existing bearing materials, according to the service life and the possibility under different working conditions, the usage of sintered metal bearing materials occupies the first place. Among bushes used in large-scale construction machinery, oil-impregnated bushes must withstand high loads, so they need to have the advantages of high strength, high oil content and wear resistance. The powder metallurgy engineering machinery bushing produced by the traditional process has high strength, but the oil content is very low, which mak...

Claims

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Application Information

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IPC IPC(8): C22C38/16B22F7/00
Inventor 聂郁来罗鹏黄建华谢华黄韶玲
Owner 广东凯洋新材料有限公司
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