Ceramic injection moulding adequacy in the fabrication of graphene reinforced cordierite–mullite for high-temperature applications

Cordierites have exceptional thermal stability and resistance to thermal shock, rendering them particularly attractive for various industrial applications. Nonetheless, their mechanical properties are relatively modest when compared to other technical ceramics. Besides, their applicability is limited due to the simplicity of shapes achievable through current processing techniques. Reinforcing cordierite with graphene together with advanced manufacturing holds the promise of substantially enhancing their properties, thereby expanding their utility. This study establishes the groundwork for employing ceramic injection moulding (CIM) in the production of complex shape parts made of cordierite reinforced with reduced graphene oxide (rGO). The adequacy of direct rGO addition to the binder components for obtaining homogeneous rGO/powder dispersions and feedstock with good rheology is assessed. The debinding and sintering conditions are adjusted to maintain the graphemic species avoiding their degradation. The prevalence of graphene is tracked and demonstrated in all CIM steps by X-ray analysis and Raman spectroscopy. Sintered parts with properties exceeding that of base cordierite are accomplished, paving the way for innovative applications of cordierite–rGO composites in diverse industrial contexts.