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Special material P210 – P213
Application
Application of KS P210 – KS P213
Plain bearings made of KS P210 – KS P213 are particularly suited for use in tribological systems with minimum lubrication or for hydrodynamic systems with high rates of mixed friction such as, for example, high-pressure injection pumps, hydro-engines or high-performance gear units. They excel by extremely low wear even at high temperatures and very good chemical resistance. Plain bearings made with a machining allowance can be reworked by chipping. This way, any misalignments can be equaled out and closer bearing plays adjusted.
Description
Brief description of the sliding material
The material family KS P210 to KS P213 encompasses different varieties in terms of sliding layer thickness and profile design of the sliding surface.
| Layer above bronze (mm) | Ready for installation | Machining allowance | Lube pockets1) | |
|---|---|---|---|---|
| KS P210 | 0,05 – 0,20 | • | • | |
| KS P211 | 0,15 – 0,20 | • | • | |
| KS P212 | 0,15 – 0,50 | • | ||
| KS P213 | 0,05 – 0,20 | • |
1) Lubrication pockets acc. to DIN ISO 3547, sampling at request
The base material consists of a steel back, a bronze bonding layer and a PEEK sliding layer with purpose-adapted fillers.
Plain bearings made of KS P210 – KS P213 have been designed for application in tribological systems with initial lubrication or for hydrodynamic systems with elevated rates of mixed friction at operating temperatures up to 200 °C.
- Material characteristics
Characteristics, limit loads Unit KS P210 - P213 Permissible specific bearing load p
- Static
- Very low sliding speed
- Oscillating, vibrating
N/mm²
N/mm²
N/mm²250
180
90Permissible sliding speed v
- With mixed friction
- Hydrodynamic
m/s
m/s3
10Permissible temperature range
°C
-60 to +200
Coefficient of thermal expansion
k-1
49 · 10-6*
Thermal conductivity W · (m·k)-1 8 – 10* *)These parameters were measured at a sliding layer thickness of 0.15 mm. Different values may be obtained when changing the sliding layer thickness
- Chemical resistance
Engine oil
Damper oil
Transmission oil
Hydraulic oil
Temperature (°C)
150
140
150
125
Duration (h)
528
528
528
528
Thickness increase (μm)
0-3
0-5
0-2
0-4
Damage through chem. attack
none
none
none
none
Bearing structure
Bearing structure of KS P210 - P213
The steel carrier material used is typically of grade C22. The steel back hardness is in the range of 100 HB – 180 HB. The bonding layer is porous, sintered CuSn10 bronze with a pore volume of 45 – 60 % and a layer thickness of 0.2 – 0.35 mm. The sliding surface is based on a filler-reinforced PEEK layer.
1 PEEK sliding layer
2 Intermediate layer
3 Steel back
Chemical composition of the sliding layer
mass-%
PEEK | 60 % |
C fibers | 10 % |
ZnS | 10 % |
TiO2 | 10 % |
Graphite | 10 % |
Manufacture
Manufacture of the sliding material
In a granulating and extrusion process, first a PEEK-based, filler-reinforced plastic sheet is produced. In a continuous sintering process, the bronze bonding layer is applied to the steel strip in such a way that a pore volume of 45 – 60 % is obtained. Next, the plastics sheet and the steel-bronze strip are joined by hot pressing and the exact material thickness is adjusted. The quality-determining parameters in this process are temperature, press power and pressing time.
Plain bearing manufacture
Sliding elements of the most varied shapes are produced from this composite by cutting, punching and forming. Flange bushings composed of wrapped bushes and punched thrust washers are joined by applying a newly developed laser welding method and boast a series of benefits compared to the standard forming process. Depending on each specific case of application, at the end of the process a finetuned corrosion protection treatment is performed.
Laser-welded flange bushing
Benefits of laser-welded flange bushings
- Possibility to combine discretional flange and bush diameters
- Closed flange-thrust contact area
- Accurate wall-thickness distribution at the flange-thrust contact surface
- Bush (radial part) and flange/thrust washer (axial part) may consist of different materials and also exhibit different material thicknesses
Quality
The entire production process is monitored and controlled by a close-meshed net of quality assurance measures.
Tribological performance
In order to demonstrate the performance capability of this new development, various tests were carried through. The results shown on the left side attest to excellent performance, also in comparison with competing design solutions. What is especially noteworthy is the high wear resistance for pump bearings in start-stop operation.
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