Powder metallurgy rare earth copper coated ferroalloy oil-retaining bearing and manufacturing method thereof

Abstract

The invention discloses a powder metallurgy rare-earth copper-clad iron alloy oil-impregnated bearing and a manufacturing method thereof. Accounted by percentage, the bearing consists of the following compositions by percentage: 18 to 22 percent of Cu, 0.2 to 1.0 percent of graphite, 0.3 to 0.8 percent of La or Ce and the residual quantity of Fe and unavoidable impurities. The bearing is made by the procedures of mixing, low temperature diffusion treatment, pressing, sintering and the like of a mixture formed by copper-clad iron powder, powder of the element La or Ce and the residual quantity of Fe and unavoidable impurities according to certain mixture ratios. The bearing uses the iron powder for substituting most of the copper powder to reduce the manufacturing cost; lead is not contained in the bearing, which meets the requirement of environmental protection; the rare earth is adopted as a catalyst for causing the copper-clad iron powder to be easily combined with other powder, and the alloy is uniformly distributed, which is beneficial for the refinement of alloy grains and leads thin through holes to be formed in the sintering body with hole connection efficiency being more than 95 percent. The mechanical property of the bearing is better than technical standards of oil-impregnated bearings sintered by copper-clad iron powder and 6-6-3 bronze powder.

Description

technical field [0001] The present invention relates to an alloy bearing manufactured by powder metallurgy, and more particularly to an alloy bearing used to rotatably support motor shafts or the like in automobiles, motorcycles, computers, electric tools, office equipment, automatic machinery, household appliances, etc. Alloy oil-impregnated bearings manufactured by sintering. technical background [0002] At present, the micro-motor bearings used in the above-mentioned various machinery and equipment not only require good anti-friction performance, but also require low mechanical sliding friction noise when the rotating shaft rotates in the bearing at high speed. Most of these bearings are made of 6-6-3 bronze powder, Cu-Sn bronze powder material, made by forming and sintering. This powder contains a large amount of copper, 850-900kg of copper per ton. According to relevant industry statistics, the total annual output of oil-impregnated bearings in my country is nearly 10...

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Problems solved by technology

However, it still has the following disadvantages: 1. Directly produce oil-impregnated bearings with copper-coated iron powder in this method, and its surface is composed of copper-coated iron powder particles, which is easy to oxidize, and the service life of the product is affected, so it is necessary to prevent oxidation and corrosion; 2. Using this method to directly use copper-clad iron powder to produce oil-impregnated bearings, the performance is unstable and the wear resistance is poor

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