iglidur® A200 - Material data

Figure 02: Maximum recommended surface pressure dependent on the temperature (18 MPa to +20 °C)

X = Temperature [°C]
Y = Load [MPa]

Figure 03: Deformation under load and temperatures

X = Load [MPa]
Y = Deformation [m/s]

Mechanical properties

Maximum recommended surface pressure represents a mechanical material parameter. Tribological conclusions cannot be drawn from it. With increasing temperatures, the compressive strength of iglidur® A200 bearings decreases. Fig. 02 clarifies this connection.
 
Figure 03 shows the elastic deformation of iglidur® A200 with radial loads. Under the maximum recommended surface pressure of 18 MPa, the deformation amounts to less than 2%. A plastic deformation is negligible up to this radial load. It is however also dependent on the period of exposure.

Maximum surface speed

m/s	Rotating	Oscillating	Linear
Constant	0,8	0,6	2
Short-term	1,5	1,1	3

Permitted surface speeds

iglidur® A200 is developed for low surface speeds. Maximum speeds up to 0.8 m/s (rotating) and 3.5 m/s (linear) respectively are permitted for continuous application in dry operation. These specified values state the limits to which the long-term permitted temperature rises due to frictional heat. In practice these limit values are not always reached due to interactions.

Figure 8.3: Maximum recommended surface pressure dependent on the temperature

Temperatures

The short-term permitted maximum temperature is + 170°C. With increasing temperatures, the compressive strength of iglidur® A200 plain bearings decreases. Fig. 02 clarifies this connection. The temperatures prevailing in the bearing system also have an influence on the bearing wear. An additional securing is recommended at temperatures higher than +50°C.
 

Figure 2.4: Coefficients of friction dependent on the surface speed, p = 0.75 MPa

Figure 05: Coefficients of friction dependent on the load, v = 0,01 m/s

X = Load [MPa]
Y = Coefficient of friction μ

Friction and wear

The coefficient of friction alters like the wear resistance with increasing load (Fig. 04 and 05).

Coefficients of friction for iglidur® A200 against steel
(Ra = 1 µm, 50 HRC)

iglidur® A200	Dry	Fat	Oil	Water
Coefficients of friction µ	0,1 - 0,4	0,09	0,04	0,04

Figure 06: Wear, rotating application with different shaft materials, p = 1 MPa, v = 0,3 m/s
 
X = shaft materials
Y = wear [μm/km]
 
A = Aluminum, hard-anodized
B = machining steel
C = Cf53
D = Cf53, hard chrome-plated
E = St37
F = V2A
G = X90

Shaft materials

The Fig. 06 and 07 display the results of tests with different shaft materials conducted with plain bearings made of iglidur® A200. In swivelling applications below a load of p = 2 MPa, the wear of iglidur® A200 plain bearings is higher than in rotating applications with equal load. Here, the shaft made of St37 is the positive exception.

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

+ resistant      0 limited resistance      - not resistant
All specifications at room temperature[+20 °C]
Table 05: Chemical resistance of the iglidur® bearings A200

Electrical properties

Specific forward resistance	> 1013 Ωcm
Surface resistance	> 1012 Ω

Chemical resistance

iglidur® A200 bearings have a good resistance to cleaning agents, fats, oils, alkalis and weak acids.

The humidity absorption of iglidur® A200 bearings amounts to about 1,5% in standard climatic conditions. The saturation limit in water is 7,6%. This should be considered according to application conditions.

Radioactive rays

iglidur® A200 bearings are radiation resistant up to a radioactive intensity of 1 x 10⁴ Gy. Higher radiations affect the material and can lead to the loss of important mechanical properties.
 

UV-resistant

iglidur® A200 bearings are resistant to UV rays.

Vacuum

The iglidur® A200 bearings can be used in vacuum only restrictedly.

Electrical properties

iglidur® A200 bearings are electrically insulating.

Maximum moisture absorption
by +23 °C/50 % r. F.	1,5 weight-%
Max. water absorption	7,6 weight-%

Table 06: Moisture absorption

Diagram 10: Effect of moisture absorption
 
X = Moisture absorption [weight %]
Y = Reduction of inside diameter [%]

The humidity absorption of iglidur® 200 bearings amounts to about 1.5% in standard climatic conditions. The saturation limit in water is 7.6 %. This should be considered according to application conditions.

Important tolerances for iglidur® A200 bearings according to ISO 3547-1 after the press-fit.

Diameter d1 [mm]	Shaft h9 [mm]	iglidur® A200 D11 [mm]	Housing H7 [mm]
Up to 3	0 - 0,025	+0,020 +0,080	0 +0,010
> 3 to 6	0 - 0,030	+0,030 +0,105	0 +0,012
> 6 to 10	0 - 0,036	+0,040 +0,130	0 +0,015
> 10 to 18	0 - 0,043	+0,050 +0,160	0 +0,018
> 18 to 30	0 - 0,052	+0,065 +0,195	0 +0,021
> 30 to 50	0 - 0,062	+0,080 +0,240	0 +0,025

Table 07: Important tolerances iaw. ISO 3547-1 after press-fitting.

Installation tolerances

iglidur® A200 plain bearings are standard bearings for shafts with h-tolerance (recommended minimum s h9).
The bearings are designed for press-fit in a housing with h7 tolerance. After the installation in a housing with nominal diameter, the inner diameter of the bearing automatically adjusts to the D11 tolerance. In certain dimensions the tolerance in dependence on the wall thickness deviates from this (See delivery program )