Friction Coefficient of Aluminum Oxide Single Crystal under Low Sliding Velocity Conditions with Metal and Polymer Materials

The article presents the results of an experimental determination of the friction coefficient of various materials (steel 95Х18 and bronze BrAZh9-4, fluoroplastic F-4 and polyamide PA-6, graphite MPG-7) in a friction pair with single-crystalline aluminum oxide under low speeds and various loads conditions. Deter-mining the coefficient of friction of aluminum oxide at low sliding velocity made it possible to record and evaluate the static friction for various counterbody materials, to identify the mechanisms of interactions between rubbing bodies and their influence on friction processes. Studies of the tribological characteristics of single crystal aluminum oxide have shown that it does not have antifriction properties and when using it in friction units, it is necessary to take into account the mating material, the load on the friction contact and the sliding velocity. Aluminum oxide has a high affinity for metals, which causes strong adhesive interaction up to wear with cohesive destruction of metals. Polymer materials such as fluoroplastic and polyamide weakly adhesively interact with aluminum oxide, which ensures stable sliding without lubrication with low friction coefficients over a wide range of loads and velocity. Dry friction of the self-lubricating graphite material is determined by the tribological properties of the graphite. At low loads and sliding velocity, the adsorption component of friction is revealed. When forces are sufficient to destroy bonds in crystalline layers of graphite, the friction process is limited by the effect of self-lubricating of graphite.

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