BEHAVIOR OF WEAR-RESISTANT EPOXY COMPOSITIONS MODIFIED BY DILUENTS UNDER CONTACT-DYNAMIC LOADING AND GAS-ABRASIVE WEAR
DOI:
https://doi.org/10.15421/jchemtech.v32i2.293333Keywords:
epoxy compositions, diluents, deformation process, ratio of deformation energy components, wear resistanceAbstract
Aim. Comparative assessment of the influence of diluents of different chemical nature and activity on the behavior of wear-resistant epoxy compositions under conditions of contact-dynamic loading, selection of an evaluation parameter for the rational use of known and new diluents in such compositions. Methods. Optical microscopy to determine the morphology of the worn surface of epoxy compositions, pulsed dynamic indentation, Kelvin-Voight models to characterize viscoelastic properties, gas-abrasive wear. Results. The influence of diluents of different chemical nature and activity from leading world manufacturers on the behavior of wear-resistant epoxy compositions based on industrial diane resin CHS-Epoxy 525 (Czech Republic) under conditions of contact-dynamic loading and gas-abrasive wear is considered and it is shown that for the studied diluents the time of the active phase of deformation is t1 ( the introduction of compositions into the matrix varies over a wider range with virtually the same time of the passive phase t2 (rebound from the surface) and is decisive in the processes of their deformation and wear. A linear dependence of the maximum deformation hmax of epoxy compositions on t1 has been established, the extrapolation of which determines the minimum value of this characteristic that can be achieved when using diluents for a given epoxy matrix. The symbatic rectilinear ratios of the components (elastic and viscous) of the deformation energy α of epoxy compositions with diluents depending on t1 and hmax were determined and it was found that their minimum deformation and, accordingly, maximum wear resistance are achieved at α~1.70. For the rational use of known and new diluents in wear-resistant epoxy compositions, it is recommended to use experimental hmax values and α values calculated on their basis using the proposed equation as evaluation parameters.
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