Major wear systems:
adhesive wear
abrasive wear
surface fatigue wear
tribo oxidation
Adhesive wear:
Adhesive wear is generally the most important type of wear for most non-lubricated moving parts, or moving parts which operate in partly lubricated conditions. Cold welding wear describes the formation of small bonds which disrupt during translation. These disruptions leave small malformations in the surface. The most important measurements to prevent adhesive wear without lubrication are:
- Raising the hardness and so preventing 'micro plastic' distortion of the surface
- Applying covalent bonded materials (ceramics and transition metals)
- Applying ceramic/ceramic, metal/plastic or metal/ceramic couples
- Excluding cubic/planar (Nickel or Austenitic steel) or homogeneous arranged metals
Adhesive wear comparison diagram:
Conditions: non-lubricated / free of abrasive medium / no inert gas.
Speed: 0,7 m/sec
Temperature: 30 °C
First record: Ring ( the adhesive counterpart, no measurement. For example the 1.2379 steel record at the first bar )
Second record: Pin ( measurement of volume-decrease. The bronze record at he the first bar )
Attention: at some "couples" the materials of pin and ring are also been tested in reversed order.
By these means, insight has been created in the "sacrificing" behavior of materials in an adhesive wear test.
Lunac 1 and 2+, 1.2379 ( normal tool steel) and ASP 60 were all hardened.
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