Steels in sliding contact in a vacuum, for instance, lose oxides and experience rapid adhesive wear
. The same materials sliding in a good lubricant have oxides replenished and wear more slowly.
Even when the strength of the flights is ignored, it would take a radial force in excess of 155,000 lb to bend the screw over the distance shown as the "wear area." In this case, the pressure simply forced the screw flights into the barrel with such force that adhesive wear
developed, tearing the metal alloys off both surfaces.
(4) did comprehensive research on the tribological properties of glass fibers, carbon fibers, and their fabrics-reinforced PEI composites under various wear conditions, such as adhesive wear
, abrasive wear, erosive wear, etc.
Therefore it can be concluded that the wear mechanisms of POM-Cu composites are mainly adhesive wear
and abrasive wear.
Thereafter, the wear was continued by the adhesive wear
between the bulk sample and the transfer film coated on metallic counterpart.
The smaller, flake-like debris indicated adhesive wear
, as the plastically deformed surface of the sample adhered to the counterface material.
For this reason, we concentrated on the adhesive wear
of these materials.
Probably, it will soften some of PI molecular chains and aggravate adhesive wear
. This can also be verified by Zhang's research work that softening effect could facilitate the wear process , In turn, the wear rate resulted from adhesive wear
and fracture would be highly consistent with the value shown in Fig.
As can be seen, in lower temperatures of tempering, the wear mechanism is a combination of abrasive and adhesive wear
. With an increase in the tempering temperature, abrasive wear mechanism was changed to the dominating adhesive mechanism which is justifiable according to the softening in the structure and the reduction in the hardness.
: This type of wear occurs when asperities of articulating materials fuse together, under the influence of pressure, and rupture subsequently due to relative motion leading to transfer of small material from one surface to other surface, as shown in Fig.
A limitation to their performance has been that they don't perform well in tribological applications involving moving metal parts, where adhesive wear
and galling tend to lead to rapid wear or failure.
These conditions lead to galling, chipping, abrasive and adhesive wear
in the tool, and significantly reduce tool life.