THE VARIATION IN INTRINSIC COERCIVITY OF IRON–COBALT POWDERS PREPARED BY ELECTROLYSIS INTO MERCURY

Abstract

Iron, cobalt, and iron–cobalt alloy particles in mercury have been prepared by electrolysis over a mercury cathode. The intrinsic coercivity at −70°C. of these particles has been measured, as deposited and after various heat-treatments; a marked difference in properties is found, which is dependent not only on heat-treatment, but also on whether or not the cathode was stirred during electrolysis. The effect of further metal additions to the iron–cobalt–mercury system is noted. In the discussion an attempt is made to explain the differences observed.

Notes

* Manuscript received 2 June 1959. Contribution to a Symposium on “The Powder Metallurgy of Magnetic Materials”, to be held in London on 16 December 1959.