CHANNOV Sintered Fe-C self lubricating bearings are made by way of compacting sintering, composed by the basic materials of Iron powder and Graphite.
SATM B439-70 GR4
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SB-SIG Bearing Features
The main factors affecting their physical mechanical properties and friction performance are the graphite content, porosity and material's microstructure.
1) Graphite Content
Mixing the graphite powder and iron powder, when compacting it to different shape, the graphite have the effect of lubricating in favor of compact density distribution. After adding the graphite into the iron materials, it can reduce friction and wear, increasing the allowed sliding speed and load,and the products tensile strength enhancing acording to the graphite content increased. With 3% graphite content, the Sintered Fe-C self-lubricating bearings with the best friction performance.
The porosity is another important feature for Sintered Fe-C selflubricating bearings. It have great affection for the materials friction performance of Sintered Fe-C selflubricating bearings. It is exactly with the same relationship between the binding of the limit load and porosity, and the concerning between the friction/wear and the material' s porosity of Sintered Fe-C selflubricating bearings.A large number of small gaps in the materials structure not only ensure to form oil fim at the bearing work surface, also guarantee the normal work in the condition of additional oilless from outside under a cetain time and some conditions.
The mechanical properties and friction performance of Sintered Fe-C selflubricating bearings mainly depends on the the materials structure. Materials carbon content determines its structure is pearlite, pearlite ferrite or pearlite cementite. In the materials of Sintered Fe-C self-lubricating bearings, the pearlite content significantly affect the properties of their friction:
·With 60~70% pearlite content, sliding speed with the least affection to the friction coefficient;
·Pearlite content less than 60%, friction coefficient increasing with sliding velocity increased accordingly;
·Pearlite content more than 70%, friction coefficient reducing with sliding velocity increased accordingly.
·Sintered Fe-C selflubricating bearing materials with 0.8~1% graphite content, it will be the most stable for the physical mechanical properties, processing performance and structure.