Preparation of Fe_(76)Si_9B_(10)P_5 Nanocrystalline Magnetic Cores by Direct-nanocrystallizing Method during Spark-plasma Sintering

摘要

Bulk nanocrystalline Fe_(76)Si_9B_(10)P_5 magnetic cores were sintered using spark-plasma technique through direct-nanocrystallizing method by Fe_(76)Si_9B_(10)P_5 amorphous alloy gas atomization powder. The saturated magnetic induction of magnetic cores was 1.5 T, and the maximum permeability was 1470. Coercive force was 38 A/m. X-ray analysis showed that the crystallization temperature of Fe_(76)Si_9B_(10)P_5 alloy decreased with the increase of the pulse current and sintering pressure. High resolution electron microscopic analysis results showed that the smaller nano grain size were obtained after spark-plasma sintering with the crystallization temperature decrease. In addition, the crystallization behaviour of the Fe_(76)Si_9B_(10)P_5 during sintering process was analyzed, and the influence of direct crystallization during spark-plasma sintering on the soft magnetic properties was discussed.