The fabrication and characterisation of low-k cordierite-based glass–ceramics by aqueous tape casting

In this work, cordierite-based glass ceramic tapes were prepared by tape casting from suspensions containing different solids loading and different average particle sizes (PS). Three different empirical models were used to fit the experimental data from relative viscosity measured at a fixed shear rate (500 s−1) versus solids loading. The green tapes were characterised by using scanning electron microscopy (SEM) and Hg porosimetry. The results showed that high values of solids volume fraction and PS ratio between glass and cordierite powders favour homogeneous and dense substrates. The dielectric properties of the sintered tapes were also measured, which met the requirements for the substrates in microelectronic and packaging industries.