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iglidur® Z - Material data

Materials table

General features Unit iglidur® Z test method
Density g/cm³ 1,40
Colour Brown
Max. humidity absorption at 23°C/50% R. H. % weight 0,3 DIN 53495
Max. water absorption % weight 1,1
Coefficient of surface friction, dynamic, against steel µ 0,06 - 0,14
PV values max. (dry) MPa x m/s 0,84

Mechanical properties
Bending E-module MPa 2.400 DIN 53457
Tensile strength at +20 °C MPa 95 DIN 53452
compressive strength MPa 65
Maximum recommended surface pressure (20° C) MPa 150
Shore D hardness 81 DIN 53505

Physical and thermal properties
Max. long term application temperature °C +250
Max. short term application temperature °C +310
Lower application temperature °C -100
Heat conductivity [W/m x K] 0,62 ASTM C 177
Coefficient of thermal expansion (at 23° C) [K-1 x 10-5] 4 DIN 53752

Electrical properties
Specific forward resistance Ωcm > 1011 DIN IEC 93
Surface resistance Ω > 1011 DIN 53482
'Table 01: Material Data


Z
 

Diagram 01: Permissible pv values for iglidur® Z bearings with a wall thickness of 1 mm in dry operation against a steel shaft, at +20 °C, mounted in a steel housing
 
X = Surface speed [m/s]
Y = Load [MPa]

In addition to iglidur® X, iglidur® Z is among the best selling iglidur® high-temperature materials. The outstanding wear behavior under extreme conditions (high loads and temperatures) is particularly noteworthy.


Figure 02: Maximum recommended surface pressure dependent on the temperature (150 MPa to +20 °C)

X = Temperature [°C]
Y = Load [MPa]
Figure 03: Deformation under load and temperatures

X = Load [MPa]
Y = Deformation [%]

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® Z plain bearings decreases. Fig. 02 clarifies this connection.
 
Figure 03 shows the elastic deformation of iglidur® Z with radial loads. The deformation is about 5.5% at 150 MPa.


m/s Rotary oscillating Linear
Constant 1,5 1,1 5
Short-term 3,5 2,5 6
Table 02: Maximum surface speeds

Permitted surface speeds

iglidur® Z is a high-temperature material suitable for applications with extremely high specific loads. The maximum values stated in Table 03 can be attained only with minor pressure loads. At the specified speeds, an increase in temperature up to the long-term permitted value can occur due to friction. In practice these limit values are not always reached due to interactions.


iglidur® Z Operating temperature
Lower - 100 °C
Upper, long-term + 250 °C
Upper, short-term + 310 °C
Secure axially in addition +145° C
Table 03: Temperature limits for iglidur® Z

Temperatures

The short-term permitted maximum temperature is + 310°C. The temperatures prevailing in the bearing system also have an influence on the bearing wear. The wear rises with increasing temperatures. Under high temperatures, iglidur® Z is also the most wear-resistant material in dry operation. An additional securing is recommended at temperatures higher than +145°C.


Fig. 04: Coefficients of friction dependent on the surface speed Figure 04: Coefficients of friction dependent on the surface speed, p = 0,75 MPa
 
X = Surface speed [m/s]
Y = Coefficient of friction μ
Fig. 05: Coefficients of friction dependent on the load 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 lowers like the wear resistance with increasing load (Fig. 04 and 05).

iglidur® Z Dry Grease Oil Water
Coefficients of friction µ 0,06 - 0,14 0,09 0,04 0,04

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


Fig. 06: Wear, rotating application with various shaft materials Fig. 06: Wear, rotating application with different shaft materials, load 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 shows, in the lower load range, wear rates that are by all means similar to that of other extremely wear-resistant iglidur® materials. In the upper range in contrast, iglidur® Z outclasses all other materials in wear resistance. If a Cf53 shaft is used, the wear is only 15 µm/km even with 45 MPa.
With low loads, the iglidur® Z bearings wear out less in pivoting applications than in rotating applications The V2A and hard-chromed shafts stand out in particular here.

Fig. 07: Wear in oscillating and rotating Fig. 07: Wear with oscillating and rotating applications with Cf53 as a function of the load
 
X = Load [MPa]
Y = Wear [μm/km]
 
A = rotating
B = oscillating

Medium Resistance
Alcohols 0
Hydrocarbons +
Greases, oils without additives +
Fuels +
Diluted acids +
Strong acids -
Diluted bases +
Strong bases -
+ resistant      0 limited resistance      - not resistant
All specifications at room temperature[+20 °C]
Table 05: Chemical resistance of the iglidur® bearings Z


Electrical properties

Specific forward resistance > 1011 Ωcm
Surface resistance > 1011 Ω

Chemical resistance

iglidur® Z bearings have a good resistance against chemicals. They possess an excellent resistance to organic solvents, fuels, oils and fats. The material is only partially resistant to weak acids.

Radioactive rays

iglidur® Z bearings are radiation resistant up to a radioactive intensity of 1 x 105 Gy.

UV-resistant

With UV radiation, the tribological properties (wear-resistance) of the iglidur® Z bearings drop by about 50%.

Vacuum

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

Electrical properties

iglidur® Z bearings are electrically insulating.


Maximum moisture absorption
by +23 °C/50 % r. F. 0,3 weight-%
Max. water absorption 1,1 weight-%

Table 06: Moisture absorption

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

humidity absorption / moisture absorption

The humidity absorption of iglidur® 200 bearings amounts to about 0,3% in standard climatic conditions. The saturation limit in water is 1,1 %.


Diameter
d1 [mm]
Shaft
h9 [mm]
iglidur® Z
F10 [mm]
Housing H7
[mm]
up to 3 0 - 0,025 +0,006 +0,046 0 +0,010
> 3 bis 6 0 - 0,030 +0,010 +0,058 0 +0,012
> 6 bis 10 0 - 0,036 +0,013 +0,071 0 +0,015
> 10 bis 18 0 - 0,043 +0,016 +0,086 0 +0,018
> 18 bis 30 0 - 0,052 +0,020 +0,104 0 +0,021
> 30 bis 50 0 - 0,062 +0,025 +0,125 0 +0,025
> 50 bis 80 0 - 0,074 +0,030 +0,150 0 +0,030
> 80 bis 120 0 - 0,087 +0,036 +0,176 0 +0,035

Table 07: Important tolerances according to ISO 3547-1 after the press-in

Installation tolerances

iglidur® Z- 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 F10 tolerance. In certain dimensions the tolerance in dependence on the wall thickness deviates from this (See delivery program )