SGO Korea Newsletter August' 2022 : Powder Metallurgy and Oilless Bearings

2022. 8. 24.

Powder Metallurgy and Oilless Bearings

Process of Forming Pores in Sintered Material

Powder metallurgy refers to a metal-forming process performed by heating compacted metal powders to just below their melting points, realizing physical properties that cannot be achieved through conventional metal forming technologies such as casting and forging. The biggest advantage of powder metallurgy is the ability to form a sponge-like porous structure by bonding the powder particles.

Oilless bearings work by allowing lubricating oil impregnated in these pores to be released during the use. As shown in the figure above, the pressure and temperature between the bearing and the shaft rise when the bearing operates, and the lubricating oil impregnated in the pores begins to flow out to form a lubrication film.

Once the operation stops, the lubricant is absorbed back into the pores, allowing the bearing to perform without lubrication for a long time. However, sintered metal bearings have a critical weakness, which is that they are not suitable for environments where high loads are applied due to their porosity. SGO’s “THEDVELON” is the bearing designed to overcome this weakness.

SGO THEDVELON

THEDVELON is a type of oilless bearing that offsets the disadvantages of the sintered metal bearings by applying a heat treatment on a steel-backed material.

It can be used for medium to high loads by supplementing the insufficient mechanical rigidity through diffusion-bonding the sintered layer and the back-steel, and the porosity of the sintered layer can also be varied. While it has an excellent abrasion resistance, it is highly price competitive owing to lower material costs compared to the conventional brass bearings.

For any inquiries about THEDVELON, please contact us by clicking the button below.

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