硅锰合金增氮制备氮化硅锰

Preparation of Si-Mn-N alloy by adding nitrogen to silicon-manganese alloy

在实验室条件下,设计9种温度制度制备氮化硅锰合金,并利用差热分析仪研究升温速率、保温温度、保温时间和降温速率对硅锰合金增氮效果的影响。结果表明,硅锰合金样品的增氮量（质量分数）为5.45%-37.92%,其均值为19.33%;影响硅锰合金增氮的主要因素是升温速率、保温温度和保温时间。硅锰合金增氮的最佳升温速率、最佳温度区间和保温时间分别为5℃/min、1 100-1 400℃、4h。在最佳温度区间1 100-1 400℃、保温4h的条件下,硅锰合金的增氮量最大,此时,硅锰合金的氮的质量分数为32.8%。使用XRD分析仪分析可得,其主要物相是Si3N4、MnSiN2和Fe2Si。硅锰合金增氮过程是固态和液态硅锰合金与氮气反应的过程,其中液态硅锰合金与氮气发生反应时增氮速度较快。

Under the laboratory conditions,nine kinds of temperature regimes were designed to prepare Si-Mn-N alloy and the effect of heating rate,holding temperature,holding time and cooling rate on the increased nitrogen content in Si-Mn alloy was investigated by differential thermal analyzer.The results show that increased nitrogen content in Si-Mn alloy sample is 5.45 mass%-37.92 mass%,and the average value is 19.33 mass%.The main factors influencing increased nitrogen content in Si-Mn alloy are heating rate,holding temperature and holding time.The optimum heating rate,optimal temperature range,and holding time for increasing nitrogen in Si-Mn alloys are 5℃/min,1100-1400℃and 4 h,respectively.Under the optimum temperature range of 1100-1400℃.and holding for 4 h,the Si-Mn alloy has the largest nitrogen content.At this time,nitrogen content in the siliconmanganese alloy is 32.8 mass%.and the main phase is Si3N4,MnSiN2 and Fe2Si by XRD analyzer.The nitrogen-enhancement process of Si-Mn alloy is a process in which solid-state and liquid-state Si-Mn alloys react with nitrogen.The nitrogen-enhancement rate of the liquid-state Si-Mn alloy reacting with nitrogen is faster.