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High Temperature Stability of ZTA-TiC-Fe Cermets Synthesized by High Gravity Combustion
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1.Key Laboratory of Cryogenic Engineering, Institute of Physical and Chemical Technology, Chinese Academy of Sciences;2.Key Laboratory of Cryogenic Engineering, Institute of Physical and Chemical Technology, Chinese Academy of Sciences, Beijing 100190

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    Abstract:

    ZTA-TiC-Fe cermet composite materials were prepared by high gravity combustion synthesis technology. X-ray diffraction (XRD), Scanning electron microscopy (SEM) and Variable temperature X-ray diffraction were used to study the phase composition, microstructure and microstructure evolution of the cermet during heating and cooling process. The results show that ZTA-TiC-Fe cermet can be fabricated directly by high gravity combustion synthesis melting-casting method; The ZTA eutectic ceramics formed by t-ZrO2 and Al2O3 with a three-dimensional network structure, and TiC-coated Fe are filled in the three-dimensional ZTA ceramics skeleton. The inefficacy mechanism of ZTA-TiC-Fe: the phase transformation of Fe and ZrO2 occurs at about 750℃; The volume changing of phase transformation of Fe and ZrO2 during heating and cooling and the internal stress release caused by the different thermal expansion coefficients of each component lead to the thermal expansion of the ZTA-TiC-Fe cermet. In the aerobic environment, the oxidation rate of Fe phase in the surface layer increases when the temperature exceeds 550℃, resulting in porous red-brown Fe2O3. The oxidation of Fe phase produces about 8 times volume expansion, resulting in the irreversible rupture of three-dimensional ceramic skeleton.

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[Guannan, Li Jiangtao. High Temperature Stability of ZTA-TiC-Fe Cermets Synthesized by High Gravity Combustion[J]. Rare Metal Materials and Engineering,2020,49(2):582~588.]
DOI:10.12442/j. issn.1002-185X. QH20190035

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History
  • Received:March 18,2019
  • Revised:April 24,2019
  • Adopted:October 23,2019
  • Online: March 12,2020
  • Published: