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郑卓,孙维民,刘正.Al2O3/Ti2AlN复合材料在900℃,1000℃和1100℃空气中的氧化行为[J].稀有金属材料与工程(英文),2018,47(9):2717~2722.[Zheng Zhuo,Sun Weimin and Liu Zheng.Oxidation behavior of Al2O3/Ti2AlN Composite at 900℃,1000℃,and 1000℃ in Air[J].Rare Metal Materials and Engineering,2018,47(9):2717~2722.]
Oxidation behavior of Al2O3/Ti2AlN Composite at 900℃,1000℃,and 1000℃ in Air
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Received:September 14, 2016  Revised:August 31, 2017
Key words: composite  Al2O3  Ti2AlN  oxidation
Foundation item:国家自然科学基金资助(项目号××××)
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Zheng Zhuo,Sun Weimin and Liu Zheng  
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      The oxidation behavior in air of Al2O3/Ti2AlN composite at temperature of 900 ℃ 1 000 ℃ and 1 100 ℃ in 20 hours were studied by oxidation weight experiment, back scanning electron imaging(BSE) and energy dispersive spectrometer (EDS). The results show the oxidation behavior of composite obeys a parabolic law from 900 ℃ to 1 100 ℃. The oxidation weight gain respectively is 2.78×10-2 kg/m2、10.4 ×10-2 kg/m2、21.9 ×10-2 kg/m2. The parabolic rate constant corresponding to 1.08×10-8 kg2/m4s、1.44×10-7 kg2/m4s、6.56×10-7 kg2/m4s. the oxide activated energy is 274 kJ/mol. The composed of oxide layer are TiO2 and Al2O3. The good oxidation resistance of Al2O3/Ti2AlN composite is coming from the continuous outer Al2O3 layer. The structure changes of oxide layer is due to The temperature effect the diffusion rate of Ti4+, Al3+ ions outward and O2- inward, it also effect the nucleation and growth rate of TiO2 and Al2O3. Those are the reason of the changes of oxide layer structure at different temperature. To control the interface between the matrix and oxidizing atmosphere is the key to improve the Al2O3/Ti2AlN composite oxidation resistance