iglidur® A160 - Material data

Figure 02: Maximum recommended surface pressure dependent on the temperature (15 MPa to +20 °C)
 
X = Temperature [°C]
Y = Load [MPa]

Figure 03: Deformation under load and temperatures
 
X = Load [MPa]
Y = Deformatio [%]

Mechanical properties

With increasing temperatures, the compressive strength of iglidur® A160 bearings decreases. Fig. 02 clarifies this connection. Maximum recommended surface pressure represents a mechanical material parameter. Tribological conclusions cannot be drawn from it.
 
Figure 03 shows the elastic deformation of iglidur® A160 with radial loads. Under the maximum recommended surface pressure of 15 MPa, the deformation amounts to less than 3,0%. A plastic deformation is negligible up to this radial load. It is however also dependent on the period of exposure.

m/s	Rotary	oscillating	Linear
Constant	0,5	0,4	2
Short-term	0,7	0,6	3

Table 02: Maximum surface speeds

Permitted surface speeds

iglidur® A160 is developed for low surface speeds. Maximum speeds up to 0,5 m/s (rotating) and 2,0 m/s (linear) respectively are permitted for continuous application in dry operation. The values specified in Table 02 state the limits to which the long-term permitted temperature rises due to friction heat. In practice these limit values are not always reached due to interactions.

iglidur® A160	Operating temperature
Lower	- 50 °C
Upper, long-term	+ 90 °C
Upper, short-term	+ 100 °C
Secure axially in addition	+ 60 °C

Table 03: Temperature limits

Temperatures

With increasing temperatures, the compressive strength of iglidur® A160 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 +60°C.

Figure 04: Coefficients of friction dependent on the surface speed, p = 0,75 MPa
 
X = Sliding speed [m/s]
Y = Coefficient of friction μ

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

Coefficient of friction and wear resistance alter with the application parameters. In the iglidur® A160 bearings, the alteration of the friction coefficient µ dependent on surface speed and the shaft's surface finish is only negligently pronounced. However, the friction value drops significantly as the load increases. The ideal surface roughness of the shaft in relation to the friction value is at 0.6-0.7 Ra.

iglidur® A181	Dry	Grease	Oil	Water
Coefficients of friction µ	0,09 - 0,19	0,08	0,03	0,04

Table 04: Coefficients of friction against steel (Ra = 1 µm, 50 HRC)

Figure 06: Wear, rotating application with different shaft materials, p = 1 MPa, v = 0,3 m/s
 
X = Shaft material
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

Figure 06 displays a summary of the results of tests with different shaft materials, which were conducted with iglidur® A160 plain bearings in dry operation. For rotational applications with low loads, the most interesting media- and corrosion-resistant shaft materials V2A, X90 and hard chrome-plated steel reveal themselves as good counter-partners. On X90 shafts, however, the wear increases the fastest with the load (Fig. 06). With Cf53 shafts, the wear in swivelling applications is exemplary compared to rotating applications. In rotation the wear, as with many other iglidur® materials, is higher than in the swivelling.

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

+ resistant      0 limited resistance      - unresistant
All specifications at room temperature[+20 °C]
Table 05: resistant to chemicals

Electrical properties

Specific forward resistance	< 1012 Ωcm
Surface resistance	< 1012 Ω

iglidur® A160 bearings are electrically insulating.

Chemical resistance

iglidur® A160 bearings can be used under various environmental conditions and in contact with numerous chemicals. Table 05 gives an overview of the chemical resistance of iglidur® A160 bearings at room temperature.

Radioactive rays

iglidur® A160 bearings are radiation resistant up to a radioactive intensity of 1 · 10⁵ Gy. Higher radiations affect the material and can lead to the loss of important mechanical properties.

UV-resistant

iglidur® A160 plain bearings are partially resistant to the impact of UV radiation.

Vacuum

In application in vacuum, the potentially existent moisture content is degassed. For this reason only the dry iglidur® A160 bearings are suitable for vacuum.

Maximum moisture absorption
by +23 °C/50 % r. F.	0,1 weight-%
Max. water absorption	0,1 weight-%

Table 06: humidity absorption

Moisture absorption

The iglidur® A160 bearings absorb up to 0.1% water through atmospheric humidity (+23°C, 50% relative atmospheric humidity), when saturated with water they absorb 0,1%.

Diameter d1 [mm]	Shaft h9 [mm]	iglidur® A160 F10 [mm]	Housing H7 [mm]
Up to 3	0 - 0,025	+0,014 +0,054	0 +0,010
> 3 to 6	0 - 0,030	+0,020 +0,068	0 +0,012
> 6 to 10	0 - 0,036	+0,025 +0,083	0 +0,015
> 10 to 18	0 - 0,043	+0,032 +0,102	0 +0,018
> 18 to 30	0 - 0,052	+0,040 +0,124	0 +0,021
> 30 to 50	0 - 0,062	+0,050 +0,150	0 +0,025

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

Installation tolerances

Iglidur® A160- bearings are standard bearings for shafts with h-tolerance (recommended minimum 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 E10 tolerance.