Abstract
Direct ink writing combined with subsequent polymer impregnation and pyrolysis (PIP) was adopted to prepare 3D SiC-based composites via the polymer-derived ceramic (PDC) route. Five types of 3D SiC scaffolds with different structural parameters, i.e. fillers of inert SiC powder and active Ti powder, predesigned interconnected pores and in-situ grown SiC coatings, were fabricated and employed in the following PIP process. The PIP process exhibited linear weight-increase stage in the first ten cycles, followed by the parabolic stage with decreased weight gain rate. Interconnected pores or coated SiCw in/on the 3D scaffolds increased the interfacial bonding strength, leading to improved strength of SiC-based composites. The current work demonstrated that dense 3D PDCs with adjustable macro-/micro-structures and compositions could be achieved via direct ink writing and the following PIP process.
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