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张冠男,李江涛.超重力燃烧合成ZTA-TiC-Fe金属陶瓷的高温稳定性[J].稀有金属材料与工程(英文),2020,49(2):582~588.[Guannan and 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.]
High Temperature Stability of ZTA-TiC-Fe Cermets Synthesized by High Gravity Combustion
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Received:March 18, 2019  Revised:April 24, 2019
Key words: high gravity combustion synthesis  cermet  thermal expansion  high temperature stability
Foundation item:自然科学基金(51702332);中国科学院低温工程学重点实验室青年科技创新项目基金资助(CRYOQN201705,CRYOQN201507)
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Guannan and Li Jiangtao  
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      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.