纳米ZrO_(2)-8%Y_(2)O_(3)水相悬浮液分散稳定性研究  

Study on the Dispersion and Stability of Nano ZrO_(2)-8%Y_(2)O_(3)Nanoparticles Aqueous Suspension

作　　者：许艳华[1] 颜文煅 何惜琴[1] XU Yan-hua;YAN Wen-duan;HE Xi-qin(Minnan University of Science and Technology,Quanzhou 362700,China)

机构地区：[1]闽南理工学院,福建泉州362700

出　　处：《表面技术》2021年第3期206-211,238,共7页Surface Technology

基　　金：泉州科技计划项目(2019G037,2019CT003)。

摘　　要：目的探究Y_(2)O_(3)为8%的纳米ZrO_(2)-8Y_(2)O_(3)(8YSZ)水相悬浮液的分散机理。方法选用PAA、PEG600、PEG2000三种不同分散剂,在不同分散剂含量和pH值条件下,制备固相含量(以质量分数计)为20%的纳米8YSZ水相悬浮液。采用Zeta电位、粒度分布和悬浮液黏度对纳米8YSZ水相悬浮液的分散稳定性进行表征。结果pH为中性时,悬浮液中分散剂PAA、PEG2000、PEG600的最佳用量(以质量分数计)分别为2.4%、2.4%、3.2%,对应的最低黏度分别为4.08、3.84、3.36 mPa·s。加入分散剂PAA后,纳米8YSZ等电点的pH值由6左移到4附近。当PH值为8时,纳米8YSZ颗粒的Zeta电位最高,达–44.5 mV。结论纳米8YSZ水相悬浮液的分散稳定性与分散剂的种类、含量和pH值有关。仅添加分散剂或调节pH值均不能使纳米8YSZ水相悬浮液分散稳定。分散剂PAA同时具有静电稳定和空间位阻稳定的作用。分散剂的总体分散效果由高到低依次为PAA、PEG2000、PEG600。制备固相含量为20%的纳米8YSZ水相悬浮液的最佳条件为:pH=8,PAA含量为2.4%。此时悬浮液的分散效果最好,黏度最低,为2.56 mPa·s。Dispersion mechanism of nano-ZrO_(2)-8wt.%Y_(2)O_(3)(8YSZ)aqueous suspension is explored to prepare a dispersion-stable nano-8YSZ aqueous suspension in the study.Dispersant PAA,PEG600,and PEG2000 including different dispersant additions and pH values are used in preparation of a nano-8YSZ aqueous suspension with 20 wt.%solid content.The dispersion and stability of nano-8YSZ aqueous suspension is characterized by Zeta potential,particle size distribution and suspension viscosity.The results show that the optimal content of dispersant PAA,PEG2000,and PEG600 in nano-8YSZ aqueous suspension at neutral pH is 2.4 wt.%,2.4 wt.%,and 3.2 wt.%respectively.The corresponded lowest viscosity is 4.08 mPa·s,3.84 mPa·s,and 3.36 mPa·s,respectively.The isoelectric point(IEP)of nano-8YSZ particles in aqueous suspension moved from the left of pH 6 to the vicinity of pH 4 after adding dispersant PAA.At pH 8,nano-8YSZ particle has its largest Zeta potential by–44.5 mV.It is found that the dispersion and stability of nano-8YSZ aqueous suspension is closely related to the types and contents of dispersant and values of pH.The dispersion and stability will not be obtained by adding dispersion or by adjusting pH value only.Dispersant PAA has both functions of electrostatic stability and steric stability.The overall dispersion effect of dispersants from high to low is PAA,PEG2000,and PEG600.In preparation of a nano-8YSZ aqueous suspension with 20 wt.%solid content,the optimum condition were pH value of 8,and dispersant PAA content of 2.4 wt.%.Then,the dispersion and stability of suspension was the best with the lowest viscosity of 2.56 mPa·s.

关 键 词：分散剂 PH值 纳米8YSZ 水相悬浮液 ZETA电位 

分 类 号：TG174.4[金属学及工艺—金属表面处理] TB321[金属学及工艺—金属学]