铁尾矿制备的功能微晶玻璃及其微波介电特性

以鞍山铁尾矿为主要原料制备了BaO-Fe2O3-Si O2微晶玻璃,并利用DSC,XRD,SEM以及FT-IR对晶化过程和微观结构及结晶动力学进行了研究.微晶玻璃的最佳热处理制度为:700℃核化3 h,950℃晶化2 h;这样可以制备出主晶相为BaFe12O19、次晶相为BaSi2O5的微晶玻璃.微晶玻璃结构中出现了BaFe12O19的红外特征吸收峰;晶体生长指数为2.8,属三维生长;介电损耗角正切值达到了0.44,而磁损耗正切值为0.017,具有较好的微波介电特性.

Preparation of BaO-Fe_2O_3-SiO_2 Glass-Ceramics from Iron Ore Tailings and Microwave Dielectric Properties

BaO-Fe2O3-SiO2 glass-ceramics were prepared with the iron ore tailings in ANSTEEL as starting material. The crystallization process, kinetics and microstructure of the glass-ceramic were investigated by DSC, XRD, SEM and FT-IR. The optimal heat-treatment schedule showed that the nucleation temperature is 700°C held for 2 h with the crystallization temperature 950°C held for 3 h and, as a result, the main and minor crystalline phases of the glass-ceramic are BaFe12O19 and BaSi2O5, respectively. The IR characteristic absorption peaks corresponding to BaFe12O19 were observed in the glass structure. The index of crystal growth is 2.8, which implies that crystals grow along three dimensional spaces. Moreover, the dielectric loss tangent is up to 0.44 while the magnetic loss tangent is only 0.017, which means that the glass-ceramic thus prepared is good at microwave dielectric properties.