Effect of BaO doping on densification of 10NiO-NiFe_2O_4 composite ceramics

The BaO doped 10NiO-NiFe2O4 composite ceramics were prepared with the cold isostatic pressing-sintering process,the effects of BaO contents and sintering temperatures on the phase composition,microstructure and density of 10NiO-NiFe2O4 composite ceramics were studied.The results show that the samples are mainly consisted of NiO and NiFe2O4 when content of BaO is in the range of 0?4%,BaO reacts with the component of 10NiO-NiFe2O4 ceramics and forms low melting point phase BaFe2O4 and Ba2Fe2O5,and Ba2+ dissolves into the ceramic base,which is important to accelerate the sintering densification and reduce densification temperature.When sintered at 1 250 ℃,the sample s doped with 1% BaO have the maximum relative density 98.90%,which increases 6.27% compared with that of the undoped samples.However,when the BaO content is 2% and 4%,the relative density of 10NiO-NiFe2O4 composite ceramics sample basically has no change.