CaO-B_2O_3玻璃助烧的零膨胀系数β-锂霞石陶瓷的制备及性能研究  

Preparation and Property of β-eucryptite Ceramics Possessing Zero Coefficient of Thermal Expansion with CaO-B_2O_3 Glass as Sintering Aid

作　　者：姚晓刚[1] 任海深 姜少虎[1] 张奕[1] 顾忠元 林慧兴[1] YAO Xiao-Gang;REN Hai-Shen;JIANG Shao-Hu;ZHANG Yi;GU Zhong-Yuan;LIN Hui-Xing(Information Materials and Devices Research Center, Shanghai Institute of Ceramics, Chinese Academy of Science, Shanghai 200050, Chin)

机构地区：[1]中国科学院上海硅酸盐研究所无机功能材料与器件重点实验室,上海200050

出　　处：《无机材料学报》2018年第4期385-389,共5页Journal of Inorganic Materials

摘　　要：采用固相反应法制备CaO-B_2O_3玻璃(简称"CB"玻璃)助烧的零膨胀系数β-锂霞石陶瓷。通过差示扫描量热(DSC)、X射线衍射(XRD)、扫描电子显微镜(SEM)手段分别对CB玻璃的热学特性和助烧后的β-锂霞石陶瓷样品的物相与显微形貌进行表征。结果表明,CB玻璃具有良好的助烧效果,可以显著降低β-锂霞石陶瓷的烧结温度(从1300℃降至1150℃),并大幅提高陶瓷的相对密度(从93.3%提高到97.4%)。加入CB玻璃助烧剂,β-锂霞石陶瓷致密性显著提高,内部无微裂纹存在。加入4wt%和6wt%CB玻璃的β-锂霞石陶瓷在室温~200℃范围内具有零膨胀系数,分别为0.02×10^(–6)/K和0.4×10^(–6)/K。然而,加入8wt%CB玻璃的β-锂霞石陶瓷样品中产生了具有高正膨胀系数的新物相LiAlO_2,使样品的热膨胀系数提高至3.46×10^(–6)/K。β-eucryptite ceramics with zero coefficient of thermal expansion （CTE） were prepared via solid state reaction method, adding CaO-B2O3 glass （CB glass） as sintering aid. The thermal property of CB glass and the crystalline phase, micro-structure of β-eucryptite ceramic samples were investigated by differential scanning calorimetry （DSC）, X-ray diffraction （XRD） and scanning electron microscope （SEM）, respectively. The results indicate that CB glass is a good sintering aid. It significantly decreased the sintering temperature of β-eucryptite ceramics （from 1300℃ to 1150℃） and increased the relative bulk density （from 93.3% to 97.5%）. No micro-cracks were found in β-eucryptite ceramics aided with CB glass. β-eucryptite ceramics added with 4wt%, 6wt% CB glass possessed zero CTE of 0.02× 10-6/K and 0.4×10-6/1（ ranging from room temperature to 200℃, respectively. However, a new phase LiA102 with extremely high positive CTE appears in the 13-eucryptite ceramics added with 8wt% CB glass which leads to a positive CTE of 3.46× 10-6/K.

关 键 词：β-锂霞石 CaO-B2O3玻璃 微裂纹 热膨胀系数 

分 类 号：TQ174[化学工程—陶瓷工业]