Abstract—

Technologically viable principles have been developed for the preparation of the MAX phase Ti₃SiC₂ by self-propagating high-temperature synthesis (SHS) with a reduction step, using titanium dioxide. We have studied the influence of synthesis conditions (starting-mixture composition and ratio of reactants) on the composition, structure, and particle size of the Ti₃SiC₂ powder. The results demonstrate that the addition of 10 to 20 wt % excess magnesium to the starting mixture leads to a decrease in the percentage of the TiSi₂ and Ti₅Si₃ silicides in the Ti₃SiC₂ powder (from 8 to 5 wt %), with the smallest percentage of titanium carbide corresponding to a 10% excess of magnesium in the starting mixture. Raising the amount of silicon in the starting mixture by 10% leads to a decrease in the percentages of the TiSi₂ and Ti₅Si₃ silicides and titanium carbide in the Ti₃SiC₂ powder. The addition of sodium chloride and magnesium perchlorate to the starting mixture has been shown to influence the percentages of the TiSi₂ and Ti₅Si₃ silicides and TiC in the Ti₃SiC₂ powder. We have optimized conditions for the synthesis of powder containing 89.1 wt % Ti₃SiC₂. The powders prepared by SHS with a reduction step consist of agglomerates of layered particles ranging in size from 130 to 770 nm.

中文翻译：

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TiO 2 -Mg-Si-C体系中燃烧合成Ti 3 SiC 2 MAX相

摘要-

已经开发出技术上可行的原理，用于通过使用氧化钛的还原步骤自蔓延高温合成（SHS）来制备MAX相Ti ₃ SiC ₂。我们已经研究了合成条件（起始混合物的组成和反应物的比例）对Ti ₃ SiC ₂粉末的组成，结构和粒径的影响。结果表明，向起始混合物中添加10至20重量％的过量镁导致Ti ₃ SiC ₂中的TiSi ₂和Ti ₅ Si ₃硅化物的百分比降低。粉末（8至5重量％），其中碳化钛的最小百分比对应于起始混合物中镁的10％过量。将起始混合物中的硅含量提高10％会导致Ti ₃ SiC ₂粉末中的TiSi ₂和Ti ₅ Si ₃硅化物和碳化钛的百分比降低。已显示向起始混合物中添加氯化钠和高氯酸镁会影响Ti ₃ SiC ₂中的TiSi ₂和Ti ₅ Si ₃硅化物和TiC的百分比粉末。我们为合成含89.1 wt％Ti ₃ SiC ₂的粉末优化了条件。通过SHS通过还原步骤制备的粉末由层状颗粒的附聚物组成，其粒径范围为130至770 nm。