Abstract

SHS in 3Si–SiO₂–nAdd mixtures, where Add = FeCl₃⋅6H₂O or Fe₂(C₂O₄)₃⋅5H₂O and n = 0.015–0.09 М, under 10 MPa of nitrogen gas was studied by XRD, SEM/EDS, and chemical analysis. The addition of gasifying salts decreased combustion temperature and improved phase composition of combustion products. In case of FeCl₃⋅6H₂O and n = 0.09 М, total yield of silicon oxynitrides Si₂N_2.2O_0.8 and Si₂N₂O attained a value of 94 wt %, due to the presence of added iron. Crystal structure of the earlier unknown Si₂N_2.2O_0.8 phase detected in combustion products derived from 3Si–SiO₂–nFeCl₃⋅6H₂O mixtures was established by XRD analysis and crystallographic modeling.

中文翻译：

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含铁盐的 Si-N-O 系统中的 SHS

摘要

SHS 在 3Si–SiO ₂ – n添加混合物中，其中 Add = FeCl ₃ ⋅6H ₂ O 或 Fe ₂ (C ₂ O ₄ ) ₃ ⋅5H ₂ O 和n = 0.015–0.09 М，在 10 MPa 的氮气下进行了研究通过 XRD、SEM/EDS 和化学分析。气化盐的加入降低了燃烧温度并改善了燃烧产物的相组成。在 FeCl ₃ ⋅6H ₂ O 和n = 0.09 М 的情况下，氮氧化硅 Si ₂ N _2.2 O _0.8和 Si ₂ N _{2 的}总产率由于添加的铁的存在，O 达到 94 重量％的值。在源自 3Si-SiO ₂ – n FeCl ₃ ⋅6H ₂ O 混合物的燃烧产物中检测到的早期未知的 Si ₂ N _2.2 O _0.8相的晶体结构是通过 XRD 分析和晶体学模型建立的。