Effect of Heat Treatment on the Microstructure and Phase Composition of ZrB2–MoSi2 Coating
Source abstract
Abstract
Composite ZrB2–MoSi2 coating modified by Y2O3 and Al was prepared by a new multi-chamber detonation accelerator (MCDS) on carbon/carbon composites. Postdeposition heat treatment of the samples at 1500 °C for 1 and 6 h was carried out in air. The effect of heat treatment on the microstructure and phase composition of the ZrB2–MoSi2 coating was investigated by scanning electron microscopy and X-ray diffraction phase analysis. The as-sprayed coating presented as a dense lamellar structure, composed of m-ZrO2, t-ZrO2, some hexagonal ZrB2, and cubic Al phases. The m-ZrO2, c-ZrO2, and h-(α-Al2O3) formed at 1500 °C. The coatings after heat treatment (1 and 6 h) exhibited a structure without cracks. The porosity (~1%) of the coating did not change after heat treatment. Thin, continuous, silica-rich film covered the surfaces of ZrO2 and Al2O3 particles, and could have played a role during heat treatment by acting as a grain lubricant for particle rearrangement.
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Research context
OpenAlex topics: Advanced ceramic materials synthesis · Advanced materials and composites · Intermetallics and Advanced Alloy Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Belgorod State National Research University, Pobeda 85, 308015 Belgorod, Russia
Belgorod State Technological University named after V.G. Shoukhov, Kostyukov 46, 308012 Belgorod, Russia
E.O. Paton Electric Welding Institute, NASU, Bozhenko 11, 03650 Kyiv, Ukraine
Funding
Russian Science Foundation
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