Open AccessEffect of carbon source on the synthesis of ZrB2–SiC composite powders
Author(s) -
Xiaoqing Lian,
Xiao Hu Hua,
X G Wang,
Lin Deng,
L Zhang
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/770/1/012095
Subject(s) - materials science , carbon black , diffractometer , composite number , carbothermic reaction , graphite , composite material , carbon fibers , scanning electron microscope , microstructure , phase (matter) , whisker , carbide , chemistry , natural rubber , organic chemistry
This study is aimed to synthesize ZrB 2 –SiC composite powders by boro-carbothermal reduction of zircon using two different carbon sources, namely expanded graphite and carbon black. The effect of carbon sources on the phase composition and microstructure of composite powders was studied using an X-ray diffractometer, a scanning electron microscope, and an energy spectrum analyzer. Pure-phase ZrB 2 –SiC composite powders were prepared in 2 h at 1550 and 1500 °C 1500 °C using expanded graphite and carbon black, respectively. In the former case, anisotropic ZrB 2 –SiC composite powders were synthesized. Their ZrB 2 phase grains had an average diameter of 2.0 μm and regular hexagonal shape, while SiC phase grains were whisker-shaped, had an average diameter of 0.15 μm and aspect ratio exceeding 20. For carbon black, finer ZrB 2 grains and shorter rod-shaped SiC grains were obtained.