Title: Effect of Ball Milling on the Magnetic Performance of Strontium Ferrite (SrFe12O19) Powders

Authors: Oluwasola K. Arigbabowo, Mehadi Hassan, Azin Asadollahnejad, Md Shafikul Islam, Holt Price, Wilhelmus J Geerts, Jitendra Tate

DOI: 10.33599/nasampe/s.24.0225

Abstract: The primary advantage of the high energy ball milling (HEBM) process is its ability to synthesize a homogeneous mixture with submicron (up to nanoscale) particle size. This approach is a viable process for particle size reduction and grain refinement of magnetic powders, which affects their domain structure and by extension the resulting magnetic properties. In this research, we designed a 9-ball milling experiment by keeping the rotational speed constant at 300rpm and varying the ball-to-powder ratio of 5:1, 8:1, and 10:1 for 6hrs, 10hrs, and 14hrs milling times. The strontium ferrite magnetic powders subjected to HEBM were analyzed for crystallite size and behavior via XRD, particle size reduction via SEM/ImageJ software/originLabPro, and magnetic performance via powder-based VSM measurement. Out of all the 9-ball milling experiments, the 6hr-8:1BPR combination yielded the best combination of magnetic properties an improvement of 25% in S-values (an indication of higher remanence and saturation) and a considerable decline in coercivity (<10% decrease). The particle size obtained at 6hr-8:1BPR is 0.59 µm with about 44% reduction from the 1.05 µm particle size of the unmilled strontium ferrites, which is within the reported single-domain particle critical size (0.5 µm – 0.65 µm). The particle size reduction of 0.59 µm at 6hr-8:1BPR would be significant in enhancing the interfacial strength in bonded magnets.

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Conference: SAMPE 2024

Publication Date: 2024/05/20

SKU: TP24-0000000225

Pages: 20

Price: $40.00