Preparation of W-TiC alloys from core-shell structure powders synthesized by an improved wet chemical method  

作　　者：Shao-Ting Lang Qing-Zhi Yan Ning-Bo Sun Xiao-Xin Zhang 

机构地区：[1]Institute of Nuclear Materials,University of Science and Technology Beijing,Beijing,100083,China

出　　处：《Rare Metals》2023年第4期1378-1386,共9页稀有金属（英文版）

基　　金：financially supported by the ITER-National Magnetic Confinement Fusion Program(No.2014GB123000)。

摘　　要：In order to improve the homogeneous distribution of the TiC particles and facilitate the TiC particles to distribute in the tungsten grain interiors,two kinds of TiCdoped tungsten precursors with a core-shell structure were prepared by an improved wet chemical method at different reaction temperature conditions.Consequently,fine platelike precursor(200-400 nm)and flower-like precursor(approximately 1.25μm)are obtained.After reduction and sintering,the microstructures of the samples were characterized by scanning electron microscopy and transmission electron microscopy.In the sample sintered from the platelike precursor,TiC particles with sizes in the range of40-300 nm and an average size of approximately 80 nm were uniformly distributed in the tungsten matrix with a high share in the grain interiors.However,in the sample sintered from the flower-like precursor,the TiC particles with sizes in the range of 50-700 nm are significantly aggregated and non-uniformly distributed in the tungsten matrix.As a result,the sample sintered from the plate-like precursor achieves higher mechanical properties and a much narrower range of bending strength values than that sintered from the flower-like precursor.The average bending strength of the sample sintered from the plate-like precursor is 655 MPa,which is higher than that of the sample sintered from the flower-like precursor(524 MPa).Different reaction mechanisms and dispersing stabilities of the TiC particles at different temperature conditions should be accounted for the differences between the two samples.

关 键 词：Wet chemical method W-TiC alloy Core-shell structures Spark plasma sintering Microstructure characterization 

分 类 号：TG146.411[一般工业技术—材料科学与工程]