Nd_2O_3优化白云鄂博西尾矿微晶玻璃性能机理  

Influence of Nd_2O_3 Addition on Performance of Glassceramics Synthesized with Tailings of Bayan-Obo West Mine

作　　者：李保卫 何晓宇[1,2] 陈华[1,3] 赵鸣[1] 孙凯宇[1,2] 

机构地区：[1]内蒙古科技大学内蒙古自治区白云鄂博矿多金属资源综合利用重点实验室,包头014010 [2]内蒙古科技大学材料与冶金学院,包头014010 [3]内蒙古科技大学数理与生物工程学院,包头014010

出　　处：《材料研究学报》2015年第11期874-880,共7页Chinese Journal of Materials Research

基　　金：国家重点基础研究发展计划2012CB722802;内蒙古科技重大专项414060901资助项目~~

摘　　要：以白云鄂博西尾矿为主要原料,用熔铸法制备了添加(0-8.73)%(质量分数,下同)Nd2O3的Ca O-Al2O3-Mg O-Si O2(CAMS)系微晶玻璃。用DTA、XRD、FEGSEM+EDS+EBSD、综合力学性能仪等手段研究了外加Nd2O3优化所制备微晶玻璃显微结构及性能的机理。结果表明:随着Nd2O3含量的提高,主晶相Ca(Mg,Al,Fe)Si2O6(辉石)逐渐细化,是主晶相晶界析出的Ca2Nd8(Si O4)6O2相的阻碍作用和这种富Nd第二相在生长过程中对Ca离子的争夺所致。Nd2O3添加量为2.21%时样品的综合性能最佳,其密度、抗折强度和耐酸碱分别为3.20 g/cm3、200 MPa、95.22%和99.23%。Glass ceramics of CaO-Al2O- MgO-SiO2 （CAMS） with addition of 0-8.73% （mass fraction） Nd2O3were synthesized mainly with the tailings of Bayan-Obo west mine by melting-casting method. The influence of the amount of Nd2O3 on the microstructure and properties of the glass ceramics was systematically investigated by DTA, XRD, FEGSEM equipped with EDS＆EBSD attachments and universal mechanical properties tester. The results show that the average grain size of the primary crystalline phase, augite （Ca（Mg, AI, Fe）Si2O6）, decreases with the increase amount of Nd2O3 addition, and the main reason can be ascribed to the hindering effects of Ca2Nd8（SiO4）6O2 particles and the consumption of Ca2. ions by the formation this newly formed Ndrich phase on the grain growth of augite crystals during the heat- treatment process. The glass ceramics with 2.21% Nd2O3 shows the optimal properties, i.e. of which the density, bending strength and the resistance to acid or alkali corrosion are 3.20 g/cm3, 200 MPa, 95.22% and 99.23%, respectively.

关 键 词：无机非金属材料 微晶玻璃 白云鄂博西尾矿 ND2O3 

分 类 号：TQ171[化学工程—玻璃工业]