|High performance polymers|
Classification of high performance polymers (compounds).
Internal lubricants and reinforcements
Listing of "high performance" and "engineering" polymers
Criteria for material selection and combinations.
Classification of high performance
High Performance polymers have a thermal resistance >150°C. Examples of hard wearing high performance polymers are:
Engineering polymers are classified by a temperature resistance within 100°C and 150°C. Examples of engineering polymers are
Standard polymers have a thermal resistance below <100°C and less suitable for sliding / rolling surfaces. Examples of these polymers are:
Traditional reinforcements and internal AF lubricants are:
Effects of reinforcements and internal AF lubricants are:
The listing below is restricted to polymers
that are "well" described by industrial suppliers. Both the
physical properties as well as the composition is described.
Unfortunately, tribology data is still limited.
Listing of "high performance" commercial polymers
Listing of "engineering" commercial polymers
Material combinations and consequences.
Internal lubricated compounds versus metal
Plastics against plastics
|Impression of friction and wear for different combinations for comparison purposes only.|
|* data from LNP, with
permission. Thrust Washer measurements,
mat.1: moving sample, mat.2 stationary counter face, k·10-15 m2/N.
* Data presented for impression, values strongly depends on pressure, velocity,
temperature, roughness, macro geometry etc.
Else than for metals
where the mechanical strength and the tribological properties are
constant (<250°C) the properties of polymers change much with the
Coefficient of friction; PA6.6-steel, Ra=0.1µm, v=0.1 m/s, p=1.5
The curve of PA6+15%PTFE is very smooth compared to the neat PA6.6.
High performance polymers can have excellent tribological properties however, disappointment may occur if the fundamentals are not fully understood. For example, glass fibre reinforcements wear the steel counter surface. A combination of dissimilar polymers is necessary to have acceptable wear resistance and low static friction. A bad heat conduction results in higher contact temperatures with degradation of the tribological aspects. For some combinations a very smooth counter surface is required. Running in conditions must be taken into account etc.
Fibre reinforced polymer versus steel