期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 38, 期 7, 页码 2792-2801出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2018.02.016
关键词
Combustion; Kinetics; Ceramics; Zirconium diboride; Silicon carbide
资金
- Ministry of Education and Science of the Russian Federation [14.578.21.0227, REMEFI57817X0227]
The work is dedicated to researching into combustion kinetics and mechanism as well as the stages of the chemical transformations during self-propagating high-temperature synthesis of ZrB2-SiC based ceramics. Dependences of the combustion temperature and rate on the initial temperature (T-0) have been studied. It has been shown that the stages of the chemical reactions of ZrB2 diboride and SiC carbide formation do not change within the range of T-0 = 298-700 K. The effective activation energy of the combustion process amounted to 170-270 kJ/mol, from which it has been concluded that chemical interaction through the melt plays a leading role. The stages of the chemical transformations in the combustion wave have been studied by dynamic X-ray diffraction. First, ZrB2 phase forms from Zr-Si melt saturated with boron, and SiC phase is registered later. The SHS method has successfully been used in order to obtain ZrB2-SiC composite powders and compact ceramics with a silicon carbide content of 25-75%. The ceramics are characterized by a residual porosity of 1.5%, hardness up to 25 GPa, the elastic modulus of 318 +/- 21 GPa, elastic recovery of 36% and thermal conductivity of 54.9 W/(m x K) at T-room.
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