Influence of Polymer Phase Type on the Tribological Characteristics of Metal-Fluoroplastic Material Bronze-Based

The results of a study examining the influence of polymer phase type on the tribological characteristics of metal-fluoroplastic material based on bronze are presented. It is shown that pressure sintering is the optimal method for obtaining the material. The tribological characteristics of a porous bronze layer not impregnated with fluoroplastic are significantly lower than those of an impregnated one. The friction coefficient is

2.4 times higher than that of a bronze layer impregnated with F-3M fluoroplastic and 3 times higher than that of a bronze layer impregnated with Hostaflon TF 4406 fluoroplastic. Wear resistance is two and five times lower, respectively. The friction coefficient of the antifriction layer made of porous bronze impregnated with F-3M fluoroplastic is 0.22, while that of Hostaflon TF 4406 is 0.17. Wear in the first case is three times greater than in the second. The friction mechanism of materials was studied, showing that wear of a porous bronze layer is accompanied by plastic deformation of bronze particles, oxidation of their surface layer, and reduction of porosity. Wear of a porous bronze layer impregnated with F-3M fluoroplastic results in wear and chipping of the fluoroplastic, exposure of bronze particles, and the incorporation of wear products into the polymer phase. Wear of a porous bronze layer impregnated with fluoroplastic results in virtually no wear of Hostaflon TF 4406 fluoroplastic, with a uniform, fine-grained, and non-porous friction surface structure.

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