Cordierite-mullite ceramics have been processed by Ceramic Injection Moulding (CIM) for the first time. The comparison with cordierite-mullite ceramics obtained by conventional ceramic process (CP) proves the effect of processing on the structure, microstructure, thermal and dielectric properties. CIM processing favours formation of larger content of mullite phase, a more homogeneous microstructure and reduced porosity than by conventional processed ceramics. These factors strongly condition the dielectric behaviour, which is analyzed by complex impedance formalism up to 850 °C and 1 MHz. The conduction mechanism is thermally activated and the activation energy is ~2.5 times larger in CP than in CIM ceramics. Thermal expansion coefficient is tuned by processing method, ranging from 3.9·10⁻⁶ °C⁻¹ to 4.6·10⁻⁶ °C⁻¹. All these findings show the strong influence of processing in cordierite-mullite ceramic composites. This work shows that tailoring composition and CIM parameters allow cordierite-mullite composites to precisely fulfill the requirements for future electronic applications.

堇青石-莫来石陶瓷首次通过陶瓷注射成型（CIM）进行了加工。与通过常规陶瓷工艺（CP）获得的堇青石-莫来石陶瓷的比较证明了加工对结构，微观结构，热和介电性能的影响。与传统的加工陶瓷相比，CIM加工有利于形成更大含量的莫来石相，更均匀的微观结构和降低的孔隙率。这些因素强烈地限制了介电性能，可通过高达850°C和1 MHz的复数阻抗形式来对其进行分析。传导机制是热激活的，CP中的激活能量比CIM陶瓷大约2.5倍。通过处理方法调整热膨胀系数，范围为3.9·10 ^-6  °C ^-1至4.6·10 ^-6  °C ^-1。所有这些发现表明加工对堇青石-莫来石陶瓷复合材料的强烈影响。这项工作表明，调整成分和CIM参数可以使堇青石-莫来石复合材料精确地满足未来电子应用的要求。