氟化镧对粉煤灰基堇青石陶瓷力学性能的影响  

Effect of LaF3 on Mechanical Performance of Fly Ash Based Cordierite Ceramics

作　　者：吴孝炯 顾雅洁 孙盛睿[2] 常星岚 孙海鹏 孙科 奚爽 刘阳桥[2] WU Xiaojiong;GU Yajie;SUN Shengrui;CHANG Xinglan;SUN Haipeng;SUN Ke;XI Shuang;LIU Yangqiao(Zhejiang Tiandi Environmental Protection Technology Co.,Ltd.,Hangzhou 311199,Zhejiang,China;Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China)

机构地区：[1]浙江天地环保科技股份有限公司,浙江杭州311199 [2]中国科学院上海硅酸盐研究所,上海200050

出　　处：《陶瓷学报》2024年第2期345-351,共7页Journal of Ceramics

基　　金：国家自然科学基金(51878647,52302124);浙江省能源集团有限公司科技项目(ZNJK-2020-110);浙江天地环保科技股份有限公司科技项目(TD-KJ-20-018)。

摘　　要：针对粉煤灰基堇青石陶瓷力学强度难以满足高质量应用要求的难题,以氟化镧为烧结助剂,制备了力学性能优异的堇青石陶瓷。当氟化镧添加量为1.0 wt.%、烧结温度为1300℃时,所得陶瓷弹性模量、硬度和压缩强度分别为200.09 GPa、17.63 GPa和118.41 MPa。性能的显著改善主要是因为氟化镧的引入可提高液相流动性,产生致密化效果;同时,镧元素可在晶界处富集促进晶粒细化增韧。此外,少量镧元素可能会进入堇青石晶格内部,亦可对力学性能产生积极影响。In order to overcome the mechanical weakness of cordierite ceramics based on fly ash,lanthanum fluoride(LaF3)was introduced in the fabrication process as high efficiency additive,resulting in cordierite ceramics with excellent mechanical properties.When the addition of LaF3 was 1.0 wt.%and the sintering temperature was 1300℃,elastic modulus,hardness and compressive strength of the samples were 200.09 GPa,17.63 GPa and 118.41 MPa,respectively.The significant enhancement was mainly attributed to the enhanced liquid fluidity and densification effect.At the same time,lanthanum was enriched at grain boundaries to facilitate grain refinement and toughening.Besides,a small quantity of lanthanum might be incoporated into the cordierite lattice,which would have a positive effect on mechanical strengthening.

关 键 词：堇青石 氟化镧 弹性模量 硬度 压缩强度 

分 类 号：TQ174.75[化学工程—陶瓷工业]