摘要
本文利用热力学分析了铁尾矿中主体元素可能发生的反应并对生成的产物进行了预测。理论分析表明,尾矿中Fe3O4和FeTiO3的还原是逐级进行的,虽有中间产物的产生,但随温度的升高,最终转化为Fe3Si和Ti(C,N),这为合成制备Fe-Si-Ti多相材料提供了理论基础。在热力学分析的基础上,采用碳热还原氮化法制备了Fe3Si-Ti(C,N)多相材料,并借助XRD和SEM对烧结体的物相和显微形貌进行了表征。结果表明,1300℃以上时,产物的主晶相为Fe3Si和Ti(C,N),与热力学分析结果吻合。通过SEM分析可知,生成的Ti(C,N)相富集在Fe3Si相的周围,形成一种高硬度、耐磨、抗腐蚀的复合材料,表明这是一条从废弃尾矿制得良好的耐磨材料的绿色工艺。
In this paper,the reactions of iron tailings were analyzed and the products were predicted by thermodynamics method. The theoretical analysis showed that reduction reactions of Fe3O4 and FeTiO3 happened step by step, and all the intermediate products would transform into Fe3Si and Ti（ C, N） with the temperature rising, which provides the theoretic foundation for synthesizing Fe-Ti-Si muhiphase materials. Based on thermomechanical analysis, Fe3Si-Ti（ C, N） were prepared by carbothermic process. Phases and microstructures of sintered body were characterized by X-ray diffraction （XRD） and scanning electron microscopy （SEM）. The experimental results indicated that the main phases of the samples were Fe3Si and TiC0.3 N0.7 when temperature was above 1300 ℃, which was in accord with the results of thermodynamic calculation. SEM showed that Fe3 Si was surrounded by Ti （C, N） , and the composite with high hardness, wear resistant and corrosion resistant could be prepared. It indicated that a green process had been successfully developed which could be used to synthesize great wear resistant materials from iron tailings.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2008年第4期667-671,共5页
Bulletin of the Chinese Ceramic Society
基金
国家科技支撑计划项目(2006BAB12B03-05
2006BAB02B04-05)
国家自然科学基金项目(50332010)
