Modification of Tribotechnical Properties of Carbon Composites by Laser Surface Treatment Method

The study of structure and tribotechnical characteristics of composite material based on carbon PAN fabric and matrix obtained by vapor deposition method has been carried out. One of the samples of the investigated material was subjected to laser treatment, with local laser heating of the surface layer to
2800—3000 °C. The other composite sample was heat treated at a temperature T > 2000 °C. Tribotechnical tests were carried out and values of friction and wear coefficients were obtained in the pair with steel and ceramic counterbodies. In order to determine the peculiarities of friction and wear mechanisms of modified materials, the surface of composites after friction was investigated by scanning electron microscopy with X-ray spectral analysis. It was found that laser treatment significantly improves antifriction properties of carbon composite in pair with steel counterbody (friction coefficient reduction by two times, wear reduction by three times). It is revealed that such treatment significantly changes the nature of the film of secondary structures (SS) formed on the friction surface of composites paired with steel. In the composition of the film elements of the counterbody material are not found, which indicates its minimal wear in the process of friction. The BC film itself becomes thicker and denser, completely covering the composite surface. This allows it to a greater extent to show solid-lubricating and anti-wear properties, improving tribotechnical characteristics of the composite.

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