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High-temperature Nitriding Mechanism of Al4O4C
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Guangchao XING, Chengji DENG, Keren CHENG, Jun DING, Hongxi ZHU, Jinghui DI, Chao YU
Journal of the Chinese Ceramic Society | 2021, 49(12) : 2767 - 2775
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Journal of the Chinese Ceramic Society | 2021, 49(12): 2767-2775
• Research Article •
High-temperature Nitriding Mechanism of Al4O4C
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Guangchao XING, Chengji DENG, Keren CHENG, Jun DING, Hongxi ZHU, Jinghui DI, Chao YU
Affiliations
  • The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, PR China

    • XING Guangchao(1994-), male, Doctorial candidate. E-mail:

About Author:

XING Guangchao(1994-), male, Doctorial candidate. E-mail:

Published: 2021-12-20 doi: 10.14062/j.issn.0454-5648.20210193
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The phase transformation, structure evolution and reaction mechanism of Al4O4C in high-temperature nitrogen were investigated. The experimental results indicate that Al4O4C reacts with nitrogen at > 7 00℃, and the nitridation reaction is composed of several cyclic processes, i.e., surface reaction, internal diffusion and mass transfer reaction. In the initial stage, nitridation reaction occurs on the surface to form a composite reaction layer of AlN, Al2O3, and C, which inhibits the diffusion of nitrogen. The nitridation reaction rate increases and the volume expansion effect associated with the formation of a large amount of AlN causes Al4O4C reaction layer to crack when the temperature increases. The loose and porous surface structure from the staggered growth of Al2O3 and AlN as gas diffusion channels can accelerate nitrogen diffusion and reaction. When the nitridation temperature is 1 600℃, the intermediate products of Al2O3, C, and N2 undergo a carbon-thermal reduction and nitridation reaction, accompanied with massive gas phase generation. The more sufficient the AlN particles develop, the more complete the crystal grain morphology will be.

aluminum oxycarbide  /  phase transformation  /  microstructure  /  nitridation  /  reaction mechanism
邢广超, 邓承继, 程可任, 丁军, 祝洪喜, 邸敬慧, 余超. Al4O4C材料的高温氮化机理. 硅酸盐学报, 2021 , 49 (12) : 2767 -2775 . DOI: 10.14062/j.issn.0454-5648.20210193
Guangchao XING, Chengji DENG, Keren CHENG, Jun DING, Hongxi ZHU, Jinghui DI, Chao YU. High-temperature Nitriding Mechanism of Al4O4C[J]. Journal of the Chinese Ceramic Society, 2021 , 49 (12) : 2767 -2775 . DOI: 10.14062/j.issn.0454-5648.20210193
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Year 2021 volume 49 Issue 12
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Article Info
doi: 10.14062/j.issn.0454-5648.20210193
  • Receive Date：2021-03-24
  • Online Date：2026-10-30
  • Published：2021-12-20
Article Data
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History
  • Received：2021-03-24
  • Revised：2021-04-20
Funding
Affiliations
    The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, PR China

Corresponding:

YU Chao(1986-), male, Ph.D., Associate Professor. E-mail:
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Citations
表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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