Effect of Heat Treatment on the Microstructure and Phase Composition of ZrB2–MoSi2 Coating

Coatings

Marina Kovaleva¹  Olga Vagina¹  Ivan Pavlenko¹  Vseslav Novikov¹  Maxim Yapryntsev¹  Igor Goncharov¹  Viacheslav Sirota²  Yuri Tyurin³  Oleg Kolisnichenko³ 

[1] 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;

关键词: carbon/carbon composites;    zrb2–mosi₂;    multi-chamber detonation accelerator;    thermal treatment;    microstructure;    x-ray methods;   

DOI  :  10.3390/coatings9120779

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown