1. Friction is the interaction between contacting surfaces when they move relative to each other under the action of external forces. When observing the surface of a material that looks very smooth under a microscope, you can see obvious bumps and depressions. Therefore, if two materials are in contact and move relative to each other, the rough particles on the surfaces of the two materials will collide with each other, and the disappearance of the rough particles can be defined as wear.

2. PEEK has outstanding sliding properties among all plastics. It can provide excellent wear resistance under various temperatures, pressures and relatively rough contact surfaces. In particular, its self-lubricating and wear-resistant properties are more prominent after being reinforced and modified with glass fiber, carbon fiber, graphite and PTFE.

3. PEEK and its composite materials can be processed into self-lubricating and wear-resistant parts that can be processed in high temperature, oil-free and corrosive environments, such as sleeves, sliders, gears and other products, to replace copper, self-lubricating composite bearings, ordinary plastic products, etc.

4. At 200°C, 3 m/s and 20 kg load, the wear factors of some higher friction materials are shown in the bar graph below.

5. PEEK modified materials have a low friction coefficient, especially those containing solid lubricants such as PTFE, graphite, and carbon fiber. They have a very low friction coefficient while ensuring mechanical properties, and can achieve long-term operation under oil-free lubrication conditions. Materials known as self-lubricating bearing grade can be used to manufacture high-temperature wear-resistant parts such as wear-resistant sleeves and sliders under oil-free lubrication conditions. The friction coefficient of some high-friction materials under 200°C, 3 m/s, and 20 kg load conditions is shown in the bar chart below.

6. There are two more indicators that reflect the wear resistance of high-performance engineering plastics. They are the PV value that the material can withstand for a long time. P refers to the load on the friction surface, and V refers to the friction surface velocity. PEEK composite materials have outstanding LPV values ​​at room temperature (20°C) and high temperature (200°C). Please see the two bar charts below for details.

7. However, due to the differences in actual application conditions in various application fields, there is no definite value, but the data of small friction coefficients and wear rates of various high-performance friction materials at room temperature and high temperature are still quite comparable. You can refer to it when designing new products, see the table below for details.

8. Graphics and charts in this article