Heat generation properties in AC magnetic field for composite powder material of the Y3Fe5O12–nSiC system prepared by reverse coprecipitation method

Abstract

Abstract:Composite powder material of the Y 3 Fe 5 O 12 -nSiC system was synthesized by a reverse coprecipitation method to study its heat generation property in an AC magnetic field. For Y 3 Fe 5 O 12 (n = 0), the maximum heat generation ability of 0.45 W·g 1 in an AC magnetic field (370 kHz, 1.77 kA·m 1 ) was obtained for the sample calcined at 1100 .℃ The SiC addition helped to suppress the particle growth for Y 3 Fe 5 O 12 at the calcination temperature. The heat generation ability was improved by the addition of the SiC powder, and the maximum value of 0.93 W·g 1 was obtained for the n = 0.3 sample calcined at 1250 . The ℃ heat generation ability and the hysteresis loss value were proportional to the cube of the magnetic field (H 3 ). The heat generation ability (W·g 1 ) of the Y 3 Fe 5 O 12 -0.3SiC sample calcined at 1250 ℃ could be expressed by the equation 4.5×10 4 · f · H 3 using the frequency f (kHz) and the magnetic field H (kA·m 1 ).