| 氮气气氛下Al对SiC-MgAl2O4复合材料物相和结构演变的影响 |
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| 引用本文： | 古晨伟,王战民,赵世贤. 氮气气氛下Al对SiC-MgAl2O4复合材料物相和结构演变的影响[J]. 硅酸盐通报, 2021, 40(10): 3200-3205 |
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| 作者姓名： | 古晨伟 王战民 赵世贤 |
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| 作者单位： | 中钢集团洛阳耐火材料研究院有限公司,先进耐火材料国家重点实验室,洛阳471039 |
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| 基金项目： | 国家自然科学基金面上项目(5207021990) |
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| 摘 要： | 以SiC、MgAl2O4细粉为主要原料,分别添加质量分数为1%、3%、5%、7%、9%和12%的金属Al,置于流动氮气中,在1 500 ℃下保温5 h烧成得到SiC-MgAl2O4复合材料,对烧后试样进行XRD、SEM及EDS分析。结果表明,1 500 ℃高温烧结后,材料体系发生一系列复杂反应,试样中物相均以β-SiC、MgAl2O4、氮化物和sialon相为主。部分金属Al在高温下氮化形成氮化铝,并参与sialon相和MgAlON形成的反应。尖晶石则转变为富铝尖晶石和MgAlON两相共存。随着Al含量的增加,尖晶石中固溶铝含量达到极限时,析出α-Al2O3。Al含量的增加使得结合相Si-Al-O-N的形貌发生变化,由板带状向板柱状过渡,最终发育成形貌较为清晰的板层状。经SEM-EDS分析,sialon相中固溶一定量的Mg元素,为sialon多型体Mg-sialon相。
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| 关 键 词： | 耐火材料 铝粉 氮气气氛 SiC-MgAl2O4复合材料 显微结构 物相组成 |
| 收稿时间： | 2021-06-24 |
Effect of Al on Phase and Structure Evolution of SiC-MgAl2O4 Composites under Nitrogen Atmosphere |
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| GU Chenwei,WANG Zhanmin,ZHAO Shixian. Effect of Al on Phase and Structure Evolution of SiC-MgAl2O4 Composites under Nitrogen Atmosphere[J]. Bulletin of the Chinese Ceramic Society, 2021, 40(10): 3200-3205 |
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| Authors: | GU Chenwei WANG Zhanmin ZHAO Shixian |
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| Affiliation: | State Key Laboratory of Advanced Refractories,Sinosteel Luoyang Institute of Refractories Research Co., Ltd., Luoyang 471039, China |
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| Abstract: | SiC-MgAl2O4 composites were fabricated in flowing nitrogen for 5 h at 1 500 ℃, using SiC and MgAl2O4 powders as well as various mass fraction of 1%, 3%, 5%, 7%, 9% and 12% aluminum powders as the raw materials. The sintered samples were analyzed by XRD, SEM and EDS. The results show that a series of reactions occur in the material system after sintering at 1 500 ℃. β-SiC, MgAl2O4, nitride and sialon as the main phases are detected in all the sintered samples. Aluminum is partially nitridated at high temperature to form aluminum nitride and participate in the reaction of sialon and MgAlON formation. The spinel is transformed into two phases coexisting with aluminum-rich spinel and MgAlON. With the increase of aluminum content, α-Al2O3 can be precipitated when the solid-solute aluminum in spinel reaches to the content limit. Moreover, as the aluminum content increases, the morphology of the Si-Al-O-N phase changes from slab-band shape to slab-columnar shape, and eventually develops a clearer plate layer shape. A certain amount of Mg element is dissolved in the sialon phase by SEM-EDS analysis, which is considered as the sialon polymorph of Mg-sialon phase. |
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| Keywords: | refractory aluminum powder nitrogen atmosphere SiC-MgAl2O4 composite microstructure phase composition |
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