High strength mullite-bond SiC porous ceramics fabricated by digital light processing

• DOI: 10.26599/jac.2024.9220835
• Publication Date: 2023-11-28T06:31:47Z
• Authors: Jian Sun; Jingde Zhang; Xu Zhang; Zihe Li; Jianzhang Li; Sijie Wei; Weibin Zhang; Weili Wang; Guifang Han
• Keywords: Mullite

Fabricating SiC ceramics via the digital light processing (DLP) technology is of great challenges due to strong absorption and high refractive index deep-colored powders, which highly differ from those resin therefore, significantly affect curing performance photosensitive slurry. In this paper, a thin silicon oxide (SiO₂) layer was in-situ formed on surface powders by pre-oxidation treatment. This method proven effectively improve ability The slurry fabricated with solid content 55 vol% viscosity 7.77 Pa·s (shear rate 30 s^-1). thickness 50 μm an exposure time only 5 s. Then, well-designed sintering additive added completely convert low-strength SiO₂ into mullite reinforcement during sintering. Complex-shaped mullite-bond were successfully fabricated. flexural strength sintered at 1550 ℃ in air reached 97.6 MPa porosity 39.2 vol%, as prepared SPS techniques.