Study on Particle Size Determination of Ultrafine Nickel Powder with Different Morphologies by Laser Particle Size Analyzer
A series of physical and chemical properties of ultrafine nickel powder change with the difference of powder morphology and particle size,so it is very important to determine the exact particle size of ultrafine nickel powder.The average particle size of porous,flake and spherical ultrafine nickel powder was measured by wet method of laser particle size analyzer.In order to determine the average particle size of ultrafine nickel powder with different morphology more accurately,different dispersants were selected for dispersion.The influences of dispersant type,ultrasonic time,mass fraction of dispersant,shading degree and number of sampling rounds on the measurement results were studied.In order to determine the best test conditions for the wet determination of the average particle size of ultrafine nickel powder by laser particle analyzer.The results show that:When the selected dispersants were FMES,L64,CAB,PECPM,CTAC and G-18,the D50 value of the ultrafine nickel powder measured by adding FMES dispersant was the smallest,while the D50 value of the ultrafine nickel powder measured by adding G-18 dispersant was the largest,indicating that the dispersant FMES improved the agglomeration of the three kinds of ultrafine nickel powders in water.The accuracy of particle size distribution measurement is higher.When the ultrasonic time was 8 minutes,D50=4.403 μm was measured for porous ultrafine nickel powder,D50=l.345 μm for flaky ultrafine nickel powder and D50=1.289 μm for spherical ultrafine nickel powder.The D50 values of the ultrafine nickel powder with the three morphologies gradually stabilized with the continuous extension of ultrasonic time.The D50 values of the ultrafine nickel powder with flake and spherical morphology are in good agreement with those of the electron microscope,but the results of the ultrafine nickel powder with porous morphology are significantly different from those of the electron microscope,which indicates that the wet method of laser particle size analyzer is not suitable for the determination of the ultrafine nickel powder with porous morphology.The number of sampling rounds has a strong linear correlation with the particle size test value.When the ultrasonic time is 8 minutes,the test results of the adjacent two rounds are more similar,which also verifies that the appropriate ultrasonic time is 8 minutes.The optimal conditions for average particle size test of ultrafine nickel powders with flake and spherical morphology are ultrasonic time of 8 minutes,mass fraction of dispersing agent FMES of 1.5％and shading of 10％-20％.The repeated test results under the best test conditions show that the average particle size of ultrafine nickel powders with flake and spherical morphology measured by laser particle size analyzer has high accuracy and data reproducibility.
NETL
NSTL
万方数据
维普
