Realization of Low Temperature Densification of Nickelate Ceramics for MLCC Application

摘要

We report an improved method for the preparation of highly dense nickelate ceramics at relatively low temperature.It is found that the introduction of appropriate additives during the ball-milling process facilitates the formation of nickelate phase through solid state reaction.Moreover,although high-purity nickelate powders can only be obtained by calcining the mixture of starting materials at temperature higher than 1100 ℃.The adoption of powders calcined at 1000 ℃,rather than those calcined at higher temperature,is conductive to the low-temperature densification of nickelate ceramics,which is attributed to the small and dispersive particles,and the solid state reaction of the residual starting materials during sintering.Compared with the conventional process,the improved method can reduce the sintering temperature of nickelate ceramics by about 100 ℃ and decrease the grain size of the obtained ceramics,and therefore makes nickelate meet the fabrication requirements of multi-layer ceramic capacitors (MLCC).