Adhesive wear materials selection

P-BN tools work satisfactorily in hardened steel up to contact temperatures of 1000°C, since there is no chemical reaction between boron nitride and iron. This, however, also depends on the binding phase of the polycrystalline materials and can lead to adhesive wear [24, 25]. In hard steel, the main wear mechanism on the tool is abrasion by hard alloy carbide particles [26]. In the case of Co-based super alloy (Vitallium), the results on hard-BN tool wear are somewhat incongruous [27, 28], while Inconel 718 can be machined under proper selection of the cutting conditions [29]. Apparently, austenitic steels containing a high percentage of Co are difficult to cut by hard-BN tools, due to the formation of cobalt nitrides which leads to high tool wear [8]. 

Primary Material Parameters. Materials selection for adhesion resistance requires carefiil consideration of the operating environment of the workpiece in addition to the total functional performance required of the workpiece itself. Wear properties of the steels vary widely with processing and heat treatment. Polymers are selected for sliding contact applications because of inherent properties such as inertness to many chemicals, relatively low galling tendency, and self-lubricating properties. Ceramics... 

Hard coated films are available that resist abrasive wear because of their high hardness and resistance to plastic deformation. Moreover, if a film is chemically stable, it is durable to both adhesive and corrosive wear. In addition to the preceding properties, a lowering of friction with any sliding material and chemical stability at high temperature are important conditions in the selection of a wear-resistant film. Ceramics satisfy these requirements to a certain extent. 

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