INFLUENCE OF THE NATURE OF THE FILLER ON THE HARD-NESS AND NOSE OF DISPERSE-FILLED COMPOSITE MATERI-ALS BASED ON EPOXY-DIANO BINDER

doi: 10.25712/ASTU.2072-8921.2021.04.022

Abstract

The protection of the surfaces of metal products from wear is a process of adhesive interaction "metal - coating". The materials used as coatings of metal surfaces are diverse, most of them are materials based on polymer composite materials. The authors analyzed dispersed-filled composite materials based on epoxy-diane resin ED-22 with amine hardener PEP. The following powders were used as fillers: mineral powder, aluminum oxide, quartz sand, graphite, wollastonite, fiberglass and others.

The use of products and equipment (for example, extruder screws) in the agricultural industry implies the wear of working, rubbing surfaces. In view of the fact that testing for wear of the material requires considerable time, first of all, a study of samples for hardness was carried out (it is known that the higher the hardness, the less abrasion).

Based on the physical and mechanical processes at the interface "matrix - filler", there is evidence of the presence of an interfacial layer, which is a non–deformable body. In this connection, when studying composites for hardness (using the Brinell method), the task was set to analyze not only fillers, but also their volume fraction in the matrix. During the analysis of the obtained dependences of hardness indicators, the dependence of the strength index on the volume fraction of the dispersed filler was established. This is due to the fact that the filler strengthens the matrix, and the degree of hardening depends on the shape of its particles, their quantity and distribution. The exception is some fillers with high hygroscopicity and low adhesion to the matrix.

As a result of sampling, taking into account the adhesive interaction of the filler and the matrix, a study was carried out for wear. The test procedure consists in carrying out full-scale tests. The duration of the tests was 90 hours.

Referring to the works of authors dealing with the issues of reducing the wear of metal surfaces, the authors conducted an analysis of experimental data. As a result, a correlation equation is derived thatallows theoretically calculating the final result of wear (abrasion) of the composite.

Based on the results of the study, recommendations on the use of correlation dependence are given. The article summarizes the experience gained and requires further study.