Controlled synthesis of high-quality W-Y2O3 composite powder precursor by ascertaining the synthesis mechanism behind the wet chemical method

作     者：Zhi Dong Nan Liu Weiqiang Hu Zongqing Ma Chong Li Chenxi Liu Qianying Guo Yongchang Liu Zhi Dong;Nan Liu;Weiqiang Hu;Zongqing Ma;Chong Li;Chenxi Liu;Qianying Guo;Yongchang Liu

作者机构：State Key Lab.of Hydraulic Engineering Simulation and SafetySchool of Materials Science and EngineeringTianjin UniversityTianjin300072China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2020年第36卷第1期

页      面：118-127页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：supported financially by the National Natural Science Foundation of China(Nos.51574178 and 51822404) the Natural Science Foundation of Tianjin(No.18JCYBJC17900) the Seed Foundation of Tianjin University(No.2018XRX-0005) 

主　　题：W-Y2O3 Wet chemical method W-OH bond Ligand Co-deposition mechanism 

摘      要：As an emerging preparation technology,wet chemical method has been employed widely to produce lots of alloy materials such as W and Mo based alloys,owing to its unique technical *** the synthesis mechanism behind wet chemical method is indispensable for controlled synthesis of highquality W-Y2 O3 composite powder *** co-deposition mechanism of yttrium and tungsten component behind the wet chemical method of preparing yttrium-doped tungsten composite nanopowder was investigated systematically in this work.A series of co-deposited composite powders fabricated under different acidity conditions were used as research targets for investigating the effect of surface composition and structure on co-deposition *** was found that white tungstic acid has more W-OH bonds and much higher co-deposition efficiency with Y^3+ions than yellow tungstic *** is illustrated that the coordination reaction between W-OH bonds on tungstic acid particles and Y^3+ions brings the co-deposition of yttrium and tungsten component into *** displacing H^+ions in W-OH bonds,Y^3+ions can be adsorbed on the surface of or incorporated into tungstic acid particles in form of ***,to control and regulate Y2 O3 content in powder precursor accurately,H^+ion concentration in wet chemical reaction should be in range of 0.55-2.82 mol L^-1 to obtain white tungstic ***,H^+ion concentration also has prominent effect on the grain size and morphology of reduced powder *** optimal value should be around 1.58 mol L^-1,which can lead to minimum W grain size(about 17 nm) without bimodal *** chemical mechanism proposed in this work could produce great sense to preparation of high-quality precursor for sintering high-performance Y2 O3 dispersion strengthened W based *** work may also shed light on the approach to exploit analogous synthesis mechanism in other alloy systems.