How to improve the wear resistance of engineering plastics bearing and plastic bushing bearing.
1. Different from metals, the wear process of polymer materials basically does not involve material oxidation and electrochemical corrosion in the friction process. Relatively speaking, the mechanism is relatively simple, but it is still challenging to solve the wear resistance of polymer materials with huge differences in physical properties.
2, from the soft and elastic rubber to the stiffness of similar metal POM, from the thickness of 2um ink coating to the production of large valve PEEK, to the micro powder wax and PTFE as the representative of the solid lubricant, plays an important role in these fields
As we know, the wear of nonmetallic materials is mainly adhesive wear and abrasive wear. Adhesive wear refers to the relative motion when the contact point of the material is transferred from one surface to another due to solid welding.
In the field of engineering plastics bearing bushing, due to the generally poor thermal conductivity of polymer materials, the local heat generated in the friction process is relatively easy to reach the melting point or softening point of engineering plastics, at this time the friction force between the solid and the melt polymer on the opposite side of the friction resistance, resulting in larger adhesive wear, often in the electron microscope as fish scale
With the addition of PTFE micropowders or laminar lubricants such as molybdenum disulfide, friction and friction heat are reduced due to the reduction of friction coefficient, and adhesive wear is controlled. When the amount of PTFE micropowder is relatively large, the transfer film between the friction surface becomes smooth, reflecting better wear resistance. At this time, the wear mode is mainly the abrasive wear of the solid on the polymer opposite the friction pair, which is often shown as furrow under the electron microscope
For engineering plastics filled with glass fiber, glass fiber will be crushed on the friction surface to form new abrasive particles, the technical index of glass fiber and filling amount will have a great impact on the wear resistance of engineering plastics.
The use condition of wear-resistant engineering plastics is a very important factor, the use of temperature, load, friction speed, dry and wet conditions have a great relationship. Taking PA6 as an example, the coefficient of friction reaches its maximum at moderate load and around 150 degrees.
Above is normally we adding PA6 fiber to nylon material improve the function of plastic bearing bushing,
