The Controlling Factors in the Content of Cr6+ in Green Strontium Ferrite

Nan Chun Chen; Han Mei Ao; Zhi Liang Zhan

doi:10.4028/www.scientific.net/MSF.610-613.28

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The Controlling Factors in the Content of Cr⁶⁺ in Green Strontium Ferrite
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HomeMaterials Science ForumMaterials Science Forum Vols. 610-613The Controlling Factors in the Content of Cr6+ in...

The Controlling Factors in the Content of Cr⁶⁺ in Green Strontium Ferrite

Abstract:

In order to reach the standard of the RoHS that the content of Cr6+ lower than 200ppm in ferrite, this reserch focused on the factors that influence on the content of Cr6+ during the preparation of Strontium Ferrite. The results show that the content of Cr6+ in Strontium Ferrit can be controlled among 91~117 ppm, and the optimum condition is as follows: the quality ratio of raw materials/graphite=10:1.25, the rate of the N2 flow 0.1~0.15 L/min, sintered temperature 950~1020°C, residence time 25~35min at the corresponding temperature point, granularity of the mixed system lower than 0.1~0.3mm.