Use Of Copper Tungsten Oxide As A Liquid Phase Sintering Aid For Barium Hexaferrite

The sintering behavior of BaFe12O19 with the addition of one and three weight % of CuWO4 as a liquid phase sintering aid is studied. Samples are sintered in the temperature range 900-1250 degrees C and the effect of CuWO4 addition on density, microstructure, phase composition and magnetic properties is examined. Compared to BaFe12O19 with no sintering aid addition, addition of 1 wt % CuWO4 retards densification. Addition of 3 wt % CuWO4 promotes densification at lower sintering temperatures but retards densification at temperatures > 1050 degrees C. Three wt % CuWO4 addition induces the formation of BaWO4 and Ba3WFe2O9 secondary phases at temperatures >= 1100 degrees C. Addition of CuWO4 causes a decrease in saturation magnetization, remanent magnetization and coercivity.