Evolution mechanism of MgAlON in the Al-Al2O3–MgO composite at 1800 °C in flowing nitrogen |
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| Authors: | Mingwei Yan Yong Li Hongyu Li Yang Sun Haiyang Chen Chenhong Ma Jialin Sun |
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| Affiliation: | 1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;2. Henan Rongjin High Temperature Materials Co., Ltd., Weihui, Henan Province 453100, China;3. School of Architecture and Construction, Hebei University of Architecture, Hebei Province 075000, China |
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| Abstract: | The Al-Al2O3–MgO composite was calcined at 1800 ℃ in flowing nitrogen, using fused corundum, tabular alumina, activated α-Al2O3, high purity magnesia and metal aluminum powder as raw materials and magnesium aluminate sol as binding agent. The calcined sample was characterized and analyzed by XRD, SEM and EDS, and evolution mechanism of MgAlON was studied. Formation mechanism of MgAlON can be described as follows. At elevated temperatures in flowing nitrogen, Al(g)/Al2O(g) diffuses and transfers along pores or gaps in the Al-Al2O3–MgO composite, being nitrided as AlN, and then AlN reacts with Al2O3-rich spinel to form granular MgAlON. In gas-gas reaction system, Al(g)/Al2O(g), N2(g), Mg(g) and O2(g) react to form flake MgAlON. |
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| Keywords: | MgAlON Evolution mechanism Corresponding author |
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