| Abstract: | 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 4h, respectively. Under the optimum temperature range of 1100-1400??. and holding for 4h, the Si- Mn alloy has the largest nitrogen content. At this time, nitrogen content in the silicon- manganese 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. |
