Properties abrasive wear comparisons

Hardness, scratch and abrasion resistance, and wear (friction) properties are characteristics which can be important for the selection of the most suitable material for a specific job. For the purpose of comparison, the designer must make sure that the data shown in the various charts have been produced using the same test methods. 

COMPARISON WITH COMPETITIVE MATERIALS Frictional properties of thermoplastics differ from those of metals. Wear of metals depends on adhesive, abrasive, fatigue, and pressure wear. In the case of plastics wear depends on adhesion and deformation of softer plastic material. Frictional forces are proportional to velocity rather than load as is the case of metals. It is always advantageous to combine two different plastics to work together (as opposite to one plastics material for two working together parts). Reinforcement by glass, carbon, and aramid fibers enhances wear resistance by increasing thermal conductivity and creep resistance. 

Although tread vulcanizates containing only a solution rubber have superior dynamic properties, their main deficiency is their poor ultimate properties, such as tear strength and tensile strength, which relate to wear. The need for improved abrasion resistance in solution rubber is indicated by a comparison of laboratory data (Table 11) for black filled vulcanizates of E-SBR, solution SBR (S-SBR) and MVBR at nearly equivalent 7. For E-SBR, it is possible that a higher tram Icis ratio of the polybutadiene portion and a broader MWD may relate to its better abrasion resistance (Pico Index). The relative values... 

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