采用红土矿和海砂矿制作的MgO-Al_(2)O_(3)-SiO_(2)微晶玻璃的结构和性能  

Structure and Properties of MgO-Al_(2)O_(3)-SiO_(2) Glass-ceramics Made from Laterite and Sea Sand Ore

作　　者：陈亚旭 高宁 王欣 郭艳玲 张捷宇 CHEN Yaxu;GAO Ning;WANG Xin;GUO Yanling;ZHANG Jieyu(State Key Laboratory of Advanced Special Steel,Shanghai 200444,China;Shanghai Key Laboratory of Advanced Ferrometallurgy,Shanghai 200444,China;School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China)

机构地区：[1]省部共建高品质特殊钢冶金与制备国家重点实验室,上海200444 [2]上海市钢铁冶金新技术开发应用重点实验室,上海200444 [3]上海大学材料科学与工程学院,上海200444

出　　处：《上海金属》2021年第4期98-104,共7页Shanghai Metals

摘　　要：以红土矿和海砂矿作原料,通过加热至1200℃保温1 h随后加热至1500℃保温2 h炉冷的高温还原工艺制备了MgO-Al_(2)O_(3)-SiO_(2)系微晶玻璃和Ni-Fe合金。采用X射线衍射(XRD)、扫描电子显微镜(SEM)、维氏硬度计等研究了源于海砂矿的TiO_(2)含量对MgOAl_(2)O_(3)-SiO_(2)微晶玻璃的结晶行为、主晶相、微观结构和性能的影响。结果表明:随着每100 g红土矿中TiO_(2)含量从0增加到2 g,微晶玻璃中逐渐析出堇青石相,其密度和维氏硬度逐渐提高;含2 g TiO_(2)的微晶玻璃的密度和维氏硬度最高,分别为2.896 g/cm^(3)和8.456 GPa;当TiO_(2)含量增加至2 g以上时,微晶玻璃中开始析出假蓝宝石相并逐渐成为主晶相,其密度和维氏硬度随之下降。此外,TiO_(2)含量不同的微晶玻璃的耐酸、耐碱度均达到了99%以上。Using both laterite and sea sand ore as raw material,MgO-Al_(2)O_(3)-SiO_(2) glass-ceramic and Ni-Fe alloy were fabricated by a high-temperature reduction process consisting of heating to 1200℃ and holding for 1 h,followed by heating to 1500℃ and holding for 2 h and furnace cooling.The effect of contents of TiO_(2) which originated from the sea sand ore on crystallization behavior,major crystalline phase,microstructure and properties of the MgO-Al_(2)O_(3)-SiO_(2) glass-ceramics was investigated with the use of XRD,SEM and Vickers hardness tester.The results showed that(a)with the increase in contents of TiO_(2) per 100 g of laterite from nil to 2 g,a cordierite precipitated gradually in glass-ceramic which offered gradually increased density and Vickers-hardness;(b)the glass-ceramic containing 2 g of TiO_(2) had the maximum density of 2.896 g/cm^(3) and Vickers-hardness of 8.456 GPa;and(c)as TiO_(2) content increased to more than 2 g,sapphire phase precipitated and gradually became the main crystalline phase in the glass-ceramic which exhibited decrease in density and Vickers-hardness.Besides,the acid and alkali resistance of glass-ceramics with different TiO_(2) contents all were over 99%.

关 键 词：红土矿 海砂矿 微晶玻璃 结晶行为 堇青石 

分 类 号：TM281[一般工业技术—材料科学与工程] TQ171.72[电气工程—电工理论与新技术]