Co^(2+)掺杂Zn_2SiO_4结晶釉生长机理的研究  

Study on the Growth Mechanism of Co^(2+) Doped Zn_2SiO_4 Crystalline Glaze

作　　者：徐新民[1] 江向平[1] 傅小龙[1] 杨帆[1] 邵虹[1] 熊珊[1] 

机构地区：[1]景德镇陶瓷学院材料科学与工程学院国家日用及建筑陶瓷工程技术研究中心江西省先进陶瓷重点实验室,景德镇333001

出　　处：《人工晶体学报》2015年第7期1855-1860,共6页Journal of Synthetic Crystals

基　　金：国家自然科学基金(91022027);江西省自然科学基金(20133ACB20002;20132BAB202002;20122BAB202001;20122BAB203019);江西省高等学校"先进陶瓷材料"科技创新团队

摘　　要：以高岭土、石英、钠长石、石灰石、氧化锌等矿物为原料,Zn O为晶核剂,并掺杂Co2+控温烧结Zn2Si O4结晶釉。利用X射线衍射仪(XRD)分析样品物相,白度色差计测量釉料色度(L*、a*、b*),EDS能谱仪分析样品组成含量。采用Johnson-Mehl-Avrami(JMA)方程对釉的结晶动力学进行分析,探讨釉中晶体的生长机理。结果表明:高温时Co2+置换了Zn2Si O4结晶釉中的Zn2+。随着保温时间的延长,掺杂了Co2+的Zn2Si O4晶体颗粒不断长大,在1140℃下保温170 min晶花达到最大,其晶花面积均值为410.91 mm2。模拟动力学分析,釉中晶体的Avrami指数n1100℃=0.82,n1140℃=1.23,n1180℃=1.12,表明晶体的形成由扩散机制向成核机制转变。拟合Arrhenius方程,晶体的活化能Ea=148.2 k J/mol。Co^2＋ doped Zn2SiO4 crystalline glaze with ZnO as a nucleation agent was prepared using quartz, albite, limestone, kaolin, zinc oxide and other minerals as raw materials by controlling the sintering temperature. The crystal structure of the samples was analyzed by X-ray diffraction （XRD）. The chromatic value （L ＊ 、 a ＊ 、 b ＊ ） of the samples was studied by colorspec. The sample content was measured by Energy Dispersive Spectrometer（EDS）. The mechanism of Co^2＋ doped ZnESiO4 crystal growth was studied by JMA equation, which helps investigate the growth kinetics of sample crystal. The results reveal that Co^2＋ ions will substitute the Zn^2＋ ions in the ZnESiO4 crystalline glaze at high temperature. Co^2＋ doped Zn2SiO4 crystal becomes greater in size with the extention of soaking time and reaches the maximum value when the soaking time was 170 min at 1140 ℃. The maximum areas value is 410.91 mm2. The Avrami exponents of crystal are n1100℃ =0.82, n1140℃= 1.23, n1180℃ = 1. 12, respectively. It reveals the formation of crystals have a trend from diffusion mechanism to the nucleation mechanism. The sample activation energy En is 148.2 kJ/mol through Arrhenius equation.

关 键 词：Zn2SiO4 结晶釉 动力学 JMA方程 

分 类 号：TQ174.43[化学工程—陶瓷工业]