粉末冶金技术2026，Vol.44Issue(1)：135-144,10.DOI:10.19591/j.cnki.cn11-1974/tf.2025040004
钨粉形貌对烧结微观组织及致密化行为的影响
Effect of tungsten powder morphology on sintering microstructure and densification mechanism
摘要
Abstract
The sintering microstructure and densification behavior of the spherical and irregular tungsten powders prepared by hot pressing(HP)and hot isostatic pressing(HIP)were systematically investigated.In the results,the irregular FW9 powders achieve the densification through coupled grain boundary diffusion and plastic flow during HIP stage,whereas the spherical SW15 and SW25 powders exhibit the progressively reduced densification efficiency dominated by plastic flow and surface diffusion mechanism,respectively.Notably,the broad particle size distribution of SW25 powders critically constrains the densification process.The FW9 sintered compacts display the average dislocation density of 0.577×1014 m-2,the low-angle grain boundaries(LAGBs)of 24.4％,the wide grain size distribution of 25～250 μm,and the average grain size of 76.04 μm with the pronounced crystallographic texture.In contrast,the SW15 and SW25 sintered compacts show the higher average dislocation densities of 0.800×1014 m-2 and 1.300×1014 m-2,the elevated LAGBs area fractions of 62.4％and 75.0％,and the uniform grain sizes of 44.68 μm and 50.15 μm,respectively,without the preferential orientation,indicating the intensified lattice distortion and plastic deformation in spherical powders during sintering.It is demonstrated that the spherical powders significantly enhance the grain size uniformity,suppress the abnormal grain growth,and avoid the texture formation,providing the critical insights for tailoring high-performance tungsten sputtering targets through powder morphology optimization.关键词
粉末形貌/热压/热等静压/致密化机理/织构Key words
powder morphology/hot pressing/hot isostatic pressing/densification mechanism/texture分类
矿业与冶金引用本文复制引用
曹甫洋,王双雄,戚延龄,韩刚,韩启航,王安东..钨粉形貌对烧结微观组织及致密化行为的影响[J].粉末冶金技术,2026,44(1):135-144,10.基金项目
江苏省科技计划资助项目(BE2023079) （BE2023079）
高性能工具全国重点实验室开放课题资助项目(GXNGJSKL-2024-12) （GXNGJSKL-2024-12）
