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CRADA final report for CRADA number C/Y-1203-0211, gelcasting of soft ferrite parts

机译:CRaDa编号为C / Y-1203-0211的CRaDa最终报告,软磁铁氧体零件的凝胶注模

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Soft ferrite parts utilized in areas such as high-energy physics have been successfully gelcast from powders supplied by the industrial partner. To achieve this, several modifications were necessary. First, the as-received ferrite powder was heated to 300, 500 or 800(degrees)C. X-ray analysis showed no changes in the crystal structure of the heat-treated powder even at 800(degrees)C, and particle size distribution and surface area analyses indicated that powders heat treated at 300 and 500(degrees) had mean size and surface area similar to those of the as-received powder. Second, to prevent the parts from shattering during the combined binder burn-off and sintering cycle, the solids loading of the gelcasting slurry was adjusted from 42 vol % to at least 50 vol % and the sintering schedule was modified slightly. These modifications resulted in the production of fired gelcast soft ferrite parts (50 mm (times) 13 mm pucks, (approximately) 125 mm OD (times) 100 mm ID (times) 25 mm rings) which sintered to (approximately)98% of the theoretical density. The partner was satisfied with the parts it received and has discussed pursuing follow-up activities in order to gelcast more complex shapes and large toroids.

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