iglidur® Q290 – material data

Diagram 02: Recommended maximum surface pressure as a function of temperature (55 MPa at +20 °C)
 
X = Temperature [°C]
Y = Load [MPa]

Diagram 03: Deformation under pressure load and temperatures
 
X = Load [MPa]
Y = Deformation [%]

Mechanical properties

With increasing temperatures, the compressive strength of iglidur® Q290 plain bearings decreases. The diagram 02 shows this inverse relationship. With the short-term permitted application temperature of +180 °C, the permitted surface pressure is still more than 10 MPa. The recommended maximum surface pressure is a mechanical material parameter. No con­clusions regarding the tribological properties can be drawn from this.

m/s	Rotating	Oscillating	Linear
Continuous	0,8	0,6	1
Short-term	2	1,4	2

Table 02: Maximum surface speeds

Permissible surface speeds

Typical applications for iglidur® Q290 bearings include mid to high-load pivoting movements at comparatively slow speeds. However, relatively high speeds are still attainable. The speeds shown in table 03 are threshold values for low bearing loads. They do not provide any indication of the wear resistance under these parameters.

Temperatures

The maximum long-term application temperature of +140  °C enables the use of iglidur® Q290 in, for example, typical applications in the agricultural, commercial vehicle or construction sectors. Starting at an operating temperature of +80  °C, an additional axial safeguard is necessary for the bearing, as a press fit alone is no longer sufficient.

Diagram 04: Coefficients of friction as a function of the surface speed, p = 0,75 MPa
 
X = Surface speed [m/s]
Y = Coefficient of friction μ

Diagram 05: Coefficient of friction as a function of the load, v = 0,01 m/s
 
X = Load [MPa]
Y = Coefficient of friction μ

Friction and wear

Please note that a sliding surface with a rough surface finish will increase the friction. The coefficient of friction of iglidur® Q290 also increases as the speed increases.

Diagram 06: Wear, rotating application with different shaft materials, p = 1 MPa, v = 0.3 m/s
 
X = Shaft material
Y = Wear [μm/km]
 
A = Aluminium, hard-anodised
B = Automatic screw steel
C = Cf53
D = Cf53, hard-chromed
E = HR carbon steel
F = 304 stainless steel
G = High grade steel

Shaft materials

Generally, the use of hardened shafts is recommended for higher loads starting at approximately 10 MPa. This is, however, often not the case in practice, especially in connection with corrosion-resistant coating methods. Thus, the iglidur® Q290 material is very influential in such applications.

Medium	Resistance
Alcohol	+ to 0
Hydrocarbons	+
Greases, oils without additives	+
Fuels	+
Diluted acids	0 to -
Strong acids	-
Diluted alkalines	+
Strong alkalines	+ to 0

+ resistant      0 limited resistance      – not resistant
All information given at room temperature [+20 °C]
Table 05: Chemical resistance of iglidur® A290

Electrical properties

Specific contact resistance	> 1012 Ω cm
Surface resistance	> 1012 Ω

Radiation resistance

Plain bearings made from iglidur® Q290 are resistant to radiation up to an intensity of 3 · 102 Gy.
 

UV resistance

iglidur® Q290 bearings have good resistance to UV rays and other weathering effects.
 

Vacuum

In a vacuum, any moisture content will outgas. Use in a vacuum is possible only to a limited extent.
 

Moisture absorption

Under normal climatic conditions, the moisture absorption of iglidur® Q290 plain bearings is 3.0  % weight. The saturation limit in water is 9.3  % weight.

Diameter d1 [mm]	Shaft h9 [mm]	iglidur® A290 D11 [mm]	Housing H7 [mm]
to 3	0 - 0,025	+0,020 +0,080	0 +0,010
> 3 bis 6	0 - 0,030	+0,030 +0,105	0 +0,012
> 6 bis 10	0 - 0,036	+0,040 +0,130	0 +0,015
> 10 bis 18	0 - 0,043	+0,050 +0,160	0 +0,018
> 18 bis 30	0 - 0,052	+0,065 +0,195	0 +0,021
> 30 bis 50	0 - 0,062	+0,080 +0,240	0 +0,025

Table 07: Important tolerances for iglidur® Q290 plain bearings according to ISO 3547-1 after being pressed in

Installation tolerances

iglidur® Q290 plain bearings are standard bearings for shafts with h-tolerance (recommended minimum h9). The bearings are designed for pressfit into a housing machined to a H7 tolerance. After being assembled into a nominal size housing, the inner diameter automatically adjusts to the E10 tolerances. For particular dimensions the tolerance differs depending on the wall thickness (please see product range table).