摘要
在传统工艺的基础上,通过改变前体锆溶液中Zr^(4+)的质量分数制备了6个相同组分的铈锆固溶体(Z-1~Z-6)。通过N2吸附-脱附、XRD和粒度分析等手段对其进行表征,以探究Zr^(4+)的质量分数对铈锆固溶体结构和老化晶粒的调控机理。结果表明:当Zr^(4+)的质量分数≤4%时,Zr^(4+)质量分数的提高将迫使样品表面的狭缝孔向小孔转化,1100℃/10 h比表面积衰减率由76.59%下降至67.85%,老化后的晶粒尺寸从18.5 nm减小至17.6 nm,粒度D50从9.91μm减小至6.11μm,铈锆固溶体的低衰减和抗烧结特性提升显著;而当Zr^(4+)的质量分数>4%时,Zr^(4+)质量分数的进一步提高所造成的颗粒团聚会衍生出更多的大孔,经高温熔融沉积将加剧铈锆固溶体的烧结,导致比表面积衰减率、老化晶粒和粒度的迅速增长。
Based on traditional methods,six cerium-zirconium solid solutions(Z-1~Z-6)with identical components were prepared by changing the mass fraction of Zr^(4+)in the precursor zirconium solution.They were characterized by N2 adsorption-desorption,XRD and particle size analysis to explore the control mechanism of Zr^(4+)mass fraction on the structure and aging crystal size of cerium-zirconium solid solution.The results showed that when the Zr^(4+)mass fraction was≤4%,increasing Zr^(4+)mass fraction forced the conversion of slit pores into smaller pores on the sample surface.The specific surface area attenuation rate decreased from 76.59%to 67.85%at 1100℃/10 h,the aging crystal size reduced from 18.5 nm to 17.6 nm,and the D50 particle size reduced from 9.91 μm to 6.11 μm,significantly improving the low attenuation and anti-sintering properties of the cerium-zirconium solid solution.However,when Zr^(4+)mass fraction was>4%,further increasing Zr^(4+)mass fraction caused particle aggregation,generating more large pores.After high-temperature melting and deposition,the sintering of cerium-zirconium solid solution was intensified,resulting in rapid increases in specific surface area attenuation rate,aging crystal size and particle size.
作者
高彬
GAO Bin(Jiangmen Kanhoo Industry Co.,Ltd.,Jiangmen Guangdong 529040,China)
出处
《当代化工》
2025年第11期2698-2703,共6页
Contemporary Chemical Industry
关键词
铈锆固溶体
孔结构
晶粒尺寸
粒度分布
耐高温老化
调控
Cerium-zirconium solid solution
Pore structure
Crystal size
Particle size distribution
High temperature aging resistance
Regulation
