摘要
以锂尾矿等为原料制备发泡陶瓷,研究了助熔组分Na_(2)O与CaO含量对发泡陶瓷高温发泡行为、孔结构与物理力学性能的影响规律,结果表明:增加Na_(2)O含量可降低发泡陶瓷的烧成温度,提升试样的发泡能力,但Na_(2)O含量超过5.5%时会导致气孔聚并、孔径增大,并降低试样的力学性能;增加CaO含量会提高烧结温度,但因促进Si—O链解聚,使高温熔体黏度降低,导致坯体泡沫稳定性降低,烧成温度范围变窄。当CaO含量超过3.5%时,试样的孔径分布变宽,体积密度增大,抗压强度降低。当Na_(2)O含量为4.5%且CaO含量不超过3.5%时,可制备出孔径微小且强度优异的低密度锂尾矿基发泡陶瓷。
This study investigates the effects of flux components Na_(2)O and CaO on the foaming behavior,pore structure,physical and mechanical properties of foamed ceramics prepared from lithium tailings by characterization techniques such as high-temperature microscopy and XRD.The results show that an increase in Na_(2)O content can lower the firing temperature of the foamed ceramics and enhance the foaming ability of the samples.However,when the Na_(2)O content exceeds 5.5%(mass fraction),it leads to pore coalescence,increased pore size,and reduced mechanical properties of the samples.An increase in CaO content raises the sintering temperature,but due to its promotion of Si—O chain depolymerization,it decreases the melt viscosity,thereby reducing the stability of the foam system and narrowing the firing temperature range of the green body.When the CaO content exceeds 3.5%(mass fraction),the pore size distribution of the samples widens,the bulk density increases,and the compressive strength decreases.A comprehensive analysis indicates that foamed ceramics with low bulk density,small and closed pores,as well as excellent compressive strength can be prepared when the Na_(2)O content is 4.5%and the CaO content does not exceed 3.5%.
作者
赵昌寿
葛雪祥
吴滨
王刚
洪文海
王彦君
戴永刚
ZHAO Changshou;GE Xuexiang;WU Bin;WANG Gang;HONG Wenhai;WANG Yanjun;DAI Yonggang(Guangdong KITO Ceramics Group Co.Ltd.,Foshan 528000,China;School of Materials Science and Engineering,Anhui University of Technology,Ma'anshan 243002,China;School of Materials Science and Engineering,South China University of Technology,Guangzhou 510641,China;Jingdezhen KITO Ceramics Co.Ltd.,Jingdezhen 333400,China)
出处
《新型建筑材料》
2025年第12期36-42,共7页
New Building Materials
基金
国家自然科学基金(青年)项目(52102014)。
关键词
锂尾矿
发泡陶瓷
助熔组分
发泡行为
孔结构
物理性能
lithium tailings
foamed ceramics
fluxing component
foaming behavior
pore structure
physical properties
