Abstract：The airflow classification process of ultrafine spherical silver powder with particle size of 0.500-3.000 μm was introduced. Spherical silver powder with three sections of particle sizes was obtained by changing the rotating frequency of the grading wheel to simulate multi-stage grading conditions. Results show that the particle size distribution of the graded product becomes narrow， and the particle size of the spherical silver powder in the middle section is 1.000-1.500 μm. The PV conversion efficiency of solar paste fabricated with middle section silver powder is significantly improved.
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2018, Vol. 28 
