Composite material "aluminum dodecaboride a-AlB12 - fluorinated polyamide": synthesis and properties

In the article, some properties of composites based on fluorinated aromatic polyamide (poly- mer matrix) and highly dispersed refractory filler - aluminum dodecaboride alpha-AlB12 are investi-gated. Fluorinated polyamide was synthesized by low temperature polycondensation in amide solvents. Cross-linked compositions were obtained by high-temperature treatment of a mixture of polyamide, epoxy oligomer, and aluminum dodecaboride (200 degrees C, 2 h). The particle sizes of alu- minum dodecaboride are analyzed by drawing the necessary cross-sections on 2D-images of the surface topography obtained by AFM. The thermal-oxidative stability of aluminum dodecaboride powder and film compositions was studied, and the activation energy of thermal destruction Ea was calculated. To determine the differences in the relief of cross-linked and non-cross-linked samples, the surfaces of the film composites were scanned using AFM. The microhardness of surfaces in cross-linked systems was established to increase significantly with an increase in the content of aluminum dodecaboride, they are also characterized by an increased temperature of deformation strength (up to 300-325 degrees C). The features of the change in the friction coefficient of the synthesized compositions depending on the material of the counterbody are studied. It is shown that when using synthesized compositions as a counterbody, the friction coefficient de- creases by an order of magnitude (f = 0.017-0.059).