Open AccessMicrostructure evolution and phase transformation of ZrB2-45MoSi2-10Al coating at high temperature
Author(s) -
М. Г. Ковалева,
V. U. Novikov,
Olga Vagina,
В. В. Сирота
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2124/1/012010
Subject(s) - materials science , microstructure , coating , composite material , ceramic , scanning electron microscope , lamella (surface anatomy) , phase (matter) , thermal stability , substrate (aquarium) , chemical engineering , chemistry , oceanography , organic chemistry , engineering , geology
The ZrB 2 -45MoSi 2 -10Al coating was prepared by a Robotic complex for detonation spraying of coatings equipped with a multi-chamber detonation accelerator on surface of carbon/carbon composites without adhesion sublayer. The coating has a lamella-type structure typical for gas-thermal coatings, well connected with C/C composite substrate without sublayer, and composed of m-ZrO 2 , t-ZrO 2 , t-MoSi 2 , some h-ZrB 2 , and c-Al phases. Heat treatment of the samples at 1500 °C for 1, 3 and 6 h was carried out in air. The effect of heat treatment on the microstructure and phase composition of the ZrB 2 -45MoSi 2 -10Al coating was investigated by X-ray diffraction and scanning electron microscopy. The c-ZrO 2 and h-(α-Al 2 O 3 ) were formed after oxidation at 1500 °C for 6 h. The uniform distribution of ZrO 2 ceramic particles and the formation of a-Al 2 O 3 enhanced the thermal stability of the coating. The coating after heat treatment (1, 3 and 6 h) exhibited structure without cracks and low porosity. The dense microstructure of the coating contributed to its good oxidation-resistant property at high temperature.