SYSTEMS AND THE PROSPECTS FOR CREATING COMPOSITE CERAMIC MATERIALS BASED ON THEM

Based on the model of regular solutions and experimental data on quasi-binary sections and individual substances, the liquidus surfaces of SiC–B₄C–Me^dB₂ quasi-ternary eutectic systems (where boride Me^dB₂ – CrB₂, VB₂, NbB₂, TaB₂, TiB₂, ZrB₂, HfB₂, W₂B₅) are built. The paper provides the comparison of theoretical calculations with experimental data and reviews regularities of SiC–B₄C–Me^dB₂ phase diagrams. It is found that there is a regular decrease in diboride concentration in the ternary eutectics with the increase in its melting point. Correlations are established between the eutectic temperature and Me^dB₂ melting point t_эвт = f(t_пл ^MedB2), the eutectic temperature and MedB2 formation enthalpy : t_эвт = f(ΔH_f ^MedB2). The type of correlations is close to similar correlations observed earlier in SiC–Me^dB₂ and B₄C–Me^dB₂ boundary quasi-binary systems. The structure and parameter analysis of the reviewed systems allows for the conclusion on the prospects of developing a wide range of engineering and functional ceramic materials and coatings based on these systems and obtained by pressureless sintering, as well as heating and consolidation pulse methods.

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