| Popis: |
A promising filler for polyepoxy composites has been proposed. It is shown that the microparticles of red brick powder (BP) usually contribute to an increase in the strength of the epoxy polymer composite (especially at 5 and 50 wt %) for compression and abrasion, as well as to reduce shrinkage. The dependence of the type of composite compression diagrams on the filler concentration is established: after filling, the diagram is smoothed out, the points of the first (yield stress, plastic deformation) and second (fracture limit) thresholds of failure of the composite are more clearly formed. At the same time, in the region of non-optimal concentrations (for example, 10% mass), the unstable form of the compression diagram and high scatter of values indicate embrittlement, loosening, and increased defectiveness of the composite structure. At high fillings (50 wt %), the nature of the failure of the composite changes significantly - the stage of plastic deformation (yield) disappears, and the sample fails along the diagonal Chernov-Luders crack; this significantly increases the compressive strength and significantly reduces shrinkage. At the same time, an increase in the BP concentration reduces the swelling resistance of the composite (in nitric acid). The obtained results indicate that particles of heat-treated alumosilicates (on the example of BP) are able to significantly strengthen and structure the epoxy polymer composite, but make it more permeable to liquid aggressive media. |
