简介：Hydrogenthermalplasmajetwasemployedtopreparenano-sizedboronpowderwithhydrogenreductionofBCl3.Themaximumyieldofnano-sizedboronpowderswasabout50%withtheoperationalconditionsofH2/BCl3of4.5:1,totalfeedof4.9m3/h,andplasmapowerof25kW.ThesampleswereanalyzedbyX-raydiffraction（XRD）,fieldemissionscanningelectronmicroscopy（FE-SEM）,andinductivelycoupledplasma-massspectrometry（ICP-MS）,inductivelycoupledplasma-atomicemissionspectrometry（ICP-AES）,inductivecombustioninfraredabsorption（ICIA）andinfraredthermalconductivityofoxygenandnitrogenanalyzer（ITCA）.Theresultsshowthattheboronpowdershavedifferentcrystalstructureswithhigherdispersionandpurity.Theaveragediameterisabout50nm,andthepurityis90.29%orso.Thisnewtechnologycanusesimpleprocesstoproducehighqualityboronpowders,andisfeasibleforindustrialproduction.