分散剂浓度对真空热压烧结Y_(2)O_(3)透明陶瓷显微结构和光学性能的影响  

Effect of Dispersant Content on Microstructure and Optical Properties of Yttrium Oxide Transparent Ceramics Prepared by Vacuum Hot-Pressing Sintering

作　　者：彭天硕 李威威[1] 梅炳初[1] PENG Tianshuo;LI Weiwei;MEI Bingchu(Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学,武汉430070

出　　处：《硅酸盐学报》2024年第3期774-782,共9页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(51972245)。

摘　　要：以硝酸钇为原料,采用沉淀法成功制备出Y_(2)O_(3)纳米粉体,通过真空热压烧结工艺制备出Y_(2)O_(3)透明陶瓷。沉淀法是制备Y_(2)O_(3)粉体的常用方法,具有反应条件温和、粉体纯度高、成本低等优点,但由于粉体在沉淀过程中容易发生团聚现象,导致陶瓷的透明性降低。为了解决这一问题,在沉淀溶液中添加了PEG4000作为分散剂,期望改善其粉体的分散性。同时,在真空热压烧结过程中,用钽箔包裹样品,有效地防止了碳污染的发生。本工作研究了PEG添加量对Y_(2)O_(3)粉体和陶瓷的影响,并找到最佳工艺参数。结果表明,当PEG添加量为0.9%(摩尔分数),烧结温度为1500℃时制备的Y_(2)O_(3)陶瓷具有最高的透明性,其在1100 nm处的直线透过率为48.4%,在600 nm处也达到了18.0%。Introduction The quality of the powder is crucial for the performance of transparent yttria ceramics.The powder characteristics,such as size,shape,distribution,and agglomeration,directly affect the densification and microstructure of the ceramics.Co-precipitation is a common method for preparing yttria powder,which has the advantages of simplicity,low cost,and scalability.However,it also has some drawbacks,such as uneven particle size distribution,severe agglomeration,and complicated post-treatment processes.The agglomeration of the powder not only reduces its activity,but also impairs its sinterability.Therefore,how to effectively disperse the powder is one of the key techniques for improving the quality of transparent yttria ceramics.Adding dispersant is a common method for dispersing the powder,among which PEG(polyethylene glycol)is a widely used dispersant,which can form strong hydrogen bonds with the surface of hydroxide colloids,and enhance the stability of the colloids by steric hindrance effect.Moreover,since PEG is an organic substance,it can be completely removed during the high-temperature calcination process,without causing any negative impact on the properties of the ceramics.In this study,we use PEG as the dispersant,and investigate its influence on the optical properties of yttria nanocrystalline powder and its sintered ceramics.Methods Zirconium oxynitrate and yttrium nitrate hexahydrate were dissolved in anhydrous ethanol to prepare dilute solutions as reaction materials.Two salt solutions were mixed according to a stoichiometric ratio of(Y_(0.97)Zr_(0.03))_(2)O_(3).Ammonium hydroxide was dissolved in 100 mL of anhydrous ethanol as a precipitant,and to investigate the effect of the addition amount of polyethylene glycol4000 as a dispersant on the dispersion of samples,and PEG4000 with different molar amounts of 0,0.1%(mole fraction),0.3%,0.6%,0.9%of Y^(3+)content was added to the precipitant.The precipitant solution was gradually added to the reactants at 4 mL/min under vigorous stirring until th

关 键 词：氧化钇 透明陶瓷 沉淀法 透过率 热压烧结 

分 类 号：TQ174.758.23[化学工程—陶瓷工业]