| Abstrakt: |
A comparative analysis of the structural-phase state, microhardness, wear resistance and wear mechanisms is carried out during tests on fixed abrasive and non-rigid fixed abrasive particles, as well as in sliding friction conditions, arc-deposited coatings with a composite material (CM) based on the powder material of the Ni–Cr–B–Si system, modified with a material containing titanium and chromium borides and obtained using the selfpropagating high temperature synthesis. It is found that under wear conditions for fixed abrasive particles, the wear resistance of CM (10% modifying composite material (MCM) + 90% ПГ-10Н-01) is 1.5 times higher, and CM (20% microns + 80% ПГ-10Н-01) is 1.7 times higher than that of the ПГ- 10Н-01 alloy. This is due to the introduction of MCM, which contributes to the formation of new crystallization centres during surfacing and as a result leads to grinding of the structure. The ПГ-10Н-01 nickel-based plastic matrix redistributes stresses, providing conditions in which solid components occupy a favourable position. This eliminates the local increase in contact pressure and reduces the probability of separation of solid wear-resistant particles. It is found that under friction under the influence of non-rigid abrasive particles, the increased wear resistance (1.2 times at a content of 10% MCM and 1.4 times at 20% MCM more compared to the ПГ-10Н-01 alloy) is due to the higher ability of CM to resist micro-cutting processes due to the formation of a structure based on a nickel matrix, which contains evenly distributed solid inclusions in the form of titanium diboride (TiB2), nickel borides (Ni3B) and chromium (CrB), titanium (TiO) and iron (Fe3O4) oxides. Based on the obtained experimental results, it is concluded that the presence of titanium diboride (TiB2), chromium borides (CrB) and nickel (Ni3B), titanium oxides (TiO) and iron (Fe3O4) in the deposited coating leads to a decrease in the intensity of wear under various friction conditions. [ABSTRACT FROM AUTHOR] |
