Characterization of H13 alloy special powders prepared by plasma rotating electrode atomization
This paper describes a production process for the preparation of H13 alloy special powders by plasma rotating electrode atomization(PREP),including raw material preparation,atomization,and powder grading.The morphology,particle size,composition,fluidity and bulk density of the powder were tested by using scanning electron microscope,particle size analyzer,nitrogen-sulfur meter,ICP,Hall flow meter and bulk density meter.And a comparison was made with the powder produced by a domestic company using aerosolization(AA).The result shows that the surface quality of H13 alloy powder produced by PREP is excellent,with high powder sphe-ricity,clean surface and almost no satellite powder,adhesive powder and hollow powder.The surface morpholo-gy is mainly fine dendritic organization with uniform organization.The physical properties of the powder are ex-cellent,with high bulk density(4.6 g/cm3)and good flowability(12.8 s/50g).The particle size of the powder is centrally distributed,and the yield of the powder of specific size is high.However,the yield of fine powder is not high,and further optimization of the process is needed.The surface quality of H13 alloy powder prepared by AA is poor,with more satellite powder,shaped powder and adherent powder,and more surface defects.In addition,the physical properties are poor,and the fluidity and bulk density are not as good as the requirements of powder products.
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