中國有色金屬學(xué)報
ZHONGGUO YOUSEJINSHU XUEBAO
| 第18卷 第11期 總第116期 2008年11月 |
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文章編號：1004-0609(2008)11-2076-06
鐵尾礦制備BaO-Fe2O3-SiO2微晶玻璃的晶化過程
于洪浩1, 2，薛向欣1，黃大威1
(1. 東北大學(xué) 材料與冶金學(xué)院，沈陽 110004；
2. 沈陽理工大學(xué) 材料科學(xué)與工程學(xué)院，沈陽 110168)
摘 要: 以鞍山鐵尾礦為主要原料制備BaO-Fe2O3-SiO2系微晶玻璃，并利用DSC、XRD、SEM以及FT-IR對微晶玻璃的晶化過程和微觀結(jié)構(gòu)進(jìn)行研究。結(jié)果表明：DSC曲線上出現(xiàn)的放熱峰所對應(yīng)的溫度800 ℃和870 ℃分別為BaSi2O5相與BaFe12O19相的析晶溫度；微晶玻璃晶化過程中的初晶相為BaSi2O5，中間過渡相為Ba2FeSi2O7，并隨著溫度的升高而消失，最終形成主晶相BaFe12O19，次晶相為BaSi2O5的微晶玻璃；隨著晶化溫度的升高，微晶玻璃的紅外吸收帶在800~700 cm−1波長范圍發(fā)生寬化，在1 100~900 cm−1和500~400 cm−1波長范圍內(nèi)發(fā)生分裂；玻璃結(jié)構(gòu)中的[FeO4]向[FeO6]轉(zhuǎn)化促進(jìn)玻璃的析晶，出現(xiàn)BaFe12O19的紅外特征吸收峰。
關(guān)鍵字: 鐵尾礦；微晶玻璃；BaFe12O19；晶化過程
Crystallization on BaO-Fe2O3-SiO2 glass-ceramic made from iron ore tailing
YU Hong-hao1, 2, XUE Xiang-xin1, HUANG Da-wei1
（1. School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China;
2. College of Materials Science and Engineering, Shenyang Ligong University, Shenyang 110168, China）
Abstract:BaO-Fe2O3-SiO2 system glass-ceramic was synthesized from iron ore tailing of Anshan as starting material. The crystallization process and microstructure of the glass-ceramic were investigated using differential scanning calorimetry (DSC), X-ray powder diffraction(XRD), scanning electron microscopy(SEM) and fourier transform infrared spectroscopy(FT-IR).The DSC results show that exopeak temperatures at 800 and 870 ℃correspond to the crystalline phase formation of BaSi2O5 and BaFe12O19, respectively. The initial crystalline phases of the sample are BaSi2O5 and Ba2FeSi2O7 as transition crystalline phase changed into BaFe12O19 with increase of temperature. The final crystalline phases of the glass-ceramic are BaFe12O19 and BaSi2O5. With the increase of crystallization temperature, infrared absorption bands of the sample are broaden within the range of 800−700 cm−1 and are splitted within the range of 1 100− 900 cm−1 and 500−400 cm−1. The crystallization is accelerated by [FeO4] fundamental unit shifted to [FeO6] in the glass structure, and BaFe12O19 as the final crystalline phase is observed.
Key words: iron ore tailing; glass-ceramic; BaFe12O19; crystallization
