igutex® TX1 - material data

Figure 02: Maximum recommended surface pressure dependent on the temperature (200 MPa to +20 °C)
 
X = Temperature [°C]
Y = Load [MPa]

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

Mechanical properties

With increasing temperatures, the compressive strength of igutex® TX1 plain bearings decreases. Diagram 02 shows this inverse relationship. At the short-term permitted application temperature of +170°C, the permitted surface pressure is still 100MPa. The maximum recommended surface pressure is a mechanical material parameter. No conclusions regarding the tribological properties can be drawn from this.

Diagram 03 shows the elastic deformation of igutex® TX1 in combination with radial loads.

Maximum surface speed

m/s	Rotary	oscillating	Linear
Constant	0,4	0,2	1
Short-term	0,9	0,5	2

Table 03: Maximum surface speeds

Permitted surface speeds

Typical applications for igutex® TX1 plain bearings are pivoting movements under high loads at comparatively low 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

igutex® TX1 is an extremely temperature-resistant material. The long-term upper temperature limit of +120°C allows for a wide range of uses in applications typical for the agricultural, commercial vehicle or construction equipment sectors. The press-in and press-out forces of igutex® TX1 plain bearings are very high over the entire temperature range. As a result, an additional locating spigot is usually not necessary. Although these forces remain very high, a certain decrease can be observed at temperatures above +100°C. Hence, in some cases a locating spigot is therefore recommended above this temperature. When temperatures are being considered, the additional frictional heat in the bearing system must be taken into account.

igutex® TX1	dry
Coefficients of friction µ	0.1

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

Friction and wear

Please note that a glide surface with a rough surface finish will increase the friction. Shafts that are too smooth also increase the bearing's coefficient of friction. We recommend shaft surfaces (Ra) of 0.4 up to a maximum of 0.7µm. Furthermore, the coefficient of friction of igutex® TX1 plain bearings largely depends on the speed and load. As the surface speed increases, the coefficient of friction will quickly increase as well. With increasing load, however, the coefficient of friction decreases continuously.

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

shaft materials

In heavy-duty applications, we generally recommend using hardened shafts. This particularly applies when working with igutex® TX1. Still, acceptable wear rates are also achieved on soft shafts with heavy-duty pivoting of less than 100MPa. The comparison of the wear rate during rotation and pivoting shown in Diagram 07 emphasises that the strength of igutex® TX1 lies in heavy-duty pivoting.

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

+ resistant 0 conditionally resistant - non-resistant

All data given at room temperature [+20°C]
Table 02: Chemical resistance of igutex® TX1

Electrical specifications igutex® TX1 plain bearings are electrically insulating.

Specific transitional resistance	>1011Ωcm	DIN IEC 93
Surface resistance	> 1013Ω	DIN 53482

Further properties

Chemical resistance
Radioactive resistance Plain bearings made from igutex® TX1 are resistant up to a radiation intensity of 2 · 10² Gy.


UV resistance igutex® TX1 plain bearings are continuously resistant to UV rays.


Vacuum In a vacuum, the small water components outgas. Use in vacuum is possible to a limited extent.

humidity absorption / moisture absorption

The moisture absorption of igutex® TX1 plain bearings amounts to 0.2% under standard climatic conditions. The saturation limit submerged in water is 0.5%.

Diameter d1 [mm]	Shaft h9 [mm]	igutex® TX1 [mm]	Housing H7 [mm]
>20 to 40	0 - 0.052	+0.020 +0.154	0 +0.021
>40 to 70	0 - 0.062	+0.025 +0.175	0 +0.025
>70 to 80	0 - 0.074	+0.050 +0.200	0 +0.030

Table 05: Important tolerances for igutex® TX1 plain bearings according to ISO 3547-1 after press-fit, without possible expansion of the housing hole

Installation tolerances

igutex® TX1 plain bearings are standard bearings for shafts with h-tolerance (at least h9 recommended). The bearings are designed for press-fit in a housing machined to an H7 tolerance. After being assembled in a housing with nominal dimension, the bearings' inner diameter normally adjusts automatically to the tolerances as stated.