First let’s look at two kinds of bearing material:
Powder metallurgy bearing metal powder as main raw material, made of powder metallurgy legal sintered body, it is porous, but also in the process of manufacture can adjust pore Du bushing is relatively free of quantity, size, shape and distribution of technical advantages. Use of the porous sintered body, and make it contain 10% ~ 40% (volume fraction) of lubricating oil, on their own for the use of solid lubrication oil bearing condition. Operation, the bearing temperature rise, due to the expansion coefficient is larger than the metal oil, thus automatically to the surface of the sliding lubrication bearing. Powder metallurgy bearings bearing with an oil can use a long time, often used in gas is not convenient.
Metal matrix with graphite bearing is a kind of both metal bearing characteristics and self-lubricating bearing characteristics of novel lubricated bearing, by load matrix, and the special formula of solid lubricating materials lubrication. It has high bearing capacity, impact resistance, high temperature resistant, self-lubricating ability and other characteristics, particularly suitable powder metallurgy bearing for overloading, low-speed, reciprocating or swing, difficult to lubrication and oil film formation, not afraid of the water and other acid erosion and erosion. With graphite bearing not only saving, energy saving, and its service life is longer than ordinary sliding bearing. At present the product has been widely used in metallurgical continuous casting machine, steel rolling equipment, mining machinery, shipping, steam turbine, water turbine, injection molding machine and equipment in the production line.
Its advantages:
1, powder metallurgy bearings is the combination of metal powder is 10 to 40% of the structure clearance; With the graphite bearing substrate is centrifugal casting; Relatively high density matrix, and the relative intensity of powder metallurgy bearings, natural than powder metallurgy bearing service life.
2, powder metallurgy bearing lubrication material is oil, suitable for closed environment of self-lubricating, in a closed condition which inevitably produce evaporation and loss, so need regular gas, increase the difficulty of the maintenance cost and maintenance, And with graphite bearing lubrication material is solid lubrication materials, even under the working condition of oil free, good lubrication effect, still can go to to ensure continuity of lubrication and sustainable, its effective lubrication life consistent with the life of the matrix.
3, the lubrication oil in the powder metallurgy bearing volatile and erosion resistance, lubricating film under high temperature and high pressure is lost, can’t be lubrication; And solid lubricant by friction, hole or slot in the solid lubricant to the friction surface transfer or negative transfer, the friction surface to form a good lubrication, strong adhesion and uniform coverage of solid transfer film, greatly reduce the friction and wear. With the friction, the embedded solid lubricant provided on the friction surface, to ensure the long-term operation of the friction pair when good lubrication.
