Reaction mechanism for in-situ β-Si Al ON formation in Fe3Si–Si3N4–Al2O3 composites
来源期刊：International Journal of Minerals Metallurgy and Materials2017年第3期
论文作者：Hai-xia Qin Yong Li Li-xiong Bai Meng-long Long Wen-dong Xue Jun-hong Chen
文章页码：324 - 331
摘 要：In this work,Fe3Si–Si3N4–Al2O3 composites were prepared at 1300°C in an N2 atmosphere using fused corundum and tabular alumina particles,Al2O3 fine powder,and ferrosilicon nitride（Fe3Si–Si3N4） as raw materials and thermosetting phenolic resin as a binder.The effect of ferrosilicon nitride with different concentrations（0wt%,5wt%,10wt%,15wt%,20wt%,and 25wt%） on the properties of Fe3Si–Si3N4–Al2O3 composites was investigated.The results show that the apparent porosity varies between 10.3% and 17.3%,the bulk density varies from 2.94 g/cm3 and 3.30 g/cm3,and the cold crushing strength ranges from 67 MPa to 93 MPa.Under the experimental conditions,ferrosilicon nitride,whose content decreases substantially,is unstable;part of the ferrosilicon nitride is converted into Fe2C,whereas the remainder is retained,eventually forming the ferrosilicon alloy.Thermodynamic assessment of the Si5AlON7 indicated that the ferrosilicon alloy accelerated the reactions between Si3N4 and α-Al2O3 fine powder and that Si in the ferrosilicon alloy was nitrided directly,forming β-Si Al ON simultaneously.In addition,fused corundum did not react directly with Si3N4 because of its low reactivity.
Hai-xia Qin，Yong Li，Li-xiong Bai，Meng-long Long，Wen-dong Xue，Jun-hong Chen
School of Materials Science and Engineering,University of Science and Technology Beijing
摘 要：In this work,Fe3Si–Si3N4–Al2O3 composites were prepared at 1300°C in an N2 atmosphere using fused corundum and tabular alumina particles,Al2O3 fine powder,and ferrosilicon nitride（Fe3Si–Si3N4） as raw materials and thermosetting phenolic resin as a binder.The effect of ferrosilicon nitride with different concentrations（0wt%,5wt%,10wt%,15wt%,20wt%,and 25wt%） on the properties of Fe3Si–Si3N4–Al2O3 composites was investigated.The results show that the apparent porosity varies between 10.3% and 17.3%,the bulk density varies from 2.94 g/cm3 and 3.30 g/cm3,and the cold crushing strength ranges from 67 MPa to 93 MPa.Under the experimental conditions,ferrosilicon nitride,whose content decreases substantially,is unstable;part of the ferrosilicon nitride is converted into Fe2C,whereas the remainder is retained,eventually forming the ferrosilicon alloy.Thermodynamic assessment of the Si5AlON7 indicated that the ferrosilicon alloy accelerated the reactions between Si3N4 and α-Al2O3 fine powder and that Si in the ferrosilicon alloy was nitrided directly,forming β-Si Al ON simultaneously.In addition,fused corundum did not react directly with Si3N4 because of its low reactivity.
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