SLFE 3002 - Sintered Iron Plain Bearing
Iron-Nickel-Sintered Metal - maintenance-free
Material - Characteristics
Iron powder with the addition of copper, nickel and molybdenium, which enhance both the high temperature strength and the resistance to scaling, forms the basis of the metal matrix.
Furthermore a solid lubricant (99,9% pure, chemical neutral electro- graphite) is enclosed pre-loaded in micro distribution.
The alloy makes a quick, self-lubricating performance possible through the building-up of a firmly adhering graphite film on the mating material.
Application Data
| temperature range | 0 up to +600 °C (under vacuum conditions or protective atmosphere up to 850 °C) |
| max. PV value | 1 MPa m/s |
| max. sliding velocity | 0,4 m/s |
| max. surface pressure | stat. 100 MPa – dyn. 50 MPa |
| thermal expansion | 12,8 x 10-6 °C-1 |
| solid lubricant | 6% Graphite |
frictional coefficient:
| dry | μ = 0,1 | up to 0,15 |
| in oil / grease | μ = 0,06 | up to 0,15 |
For Bearing Design
Recommended minimum wall thickness a: (d = Ø bearing hole)
| a = √ (d ⋅ 0,5) | up to 10 N/mm² |
| a = √ (d ⋅ 0,6) | over 10 to 25 N/mm² |
| a = √ (d ⋅ 0,8) | over 25 N/mm² |
Recommended fittings for the plain bearing and the sliding counterparts
| shaft | h7 |
| housing | H7 |
| bearing inner diameter | C7 (decreases down to D8 after pressed-in) |
| bearing outer diameter | r6 |
Thermal expansion has to be taken into account at bearing temperatures above 80 °C.
Mating Material
| surface roughness | Ra = 0,2 μm up to 0,8 μm |
| minimum hardness | > 180 HB
recommended hardness > 45HRC |
In order to achieve ideal sliding and wearing properties, machine-building steel should be used, which is resistant to both deformation at elevated temperatures and scaling and which has a surface hardness of at least 45 HRC (in cold condition).
