SiC Ceramic Component via Binder Jetting and Carbonization

The patent replaces the laser sintering method (thermal field-based) with a binder jetting method (mechanical deposition-based). In binder jetting, a binder solution is selectively deposited onto powder layers using a printing mechanism, forming green bodies that are then sintered. This substitution eliminates the need for high-energy laser beams, enabling faster production speeds while maintaining the ability to create complex geometric structures through digital slicing and layer-by-layer deposition.

The patent segments the heating process into two distinct stages: first, a low-temperature drying stage to remove binder solution and form a stable green body with uniform structure; second, a high-temperature sintering stage to densify the ceramic. This segmentation prevents thermal shock and warping by avoiding rapid temperature changes during the forming process, while still enabling complex geometric structures to be produced through the binder jetting method.

The patent performs preliminary binder deposition and drying to form a stable green body structure before applying high-temperature sintering. The binder solution acts as a temporary framework that holds the powder particles together during the forming process, preventing collapse and eliminating the need for support structures during sintering. This preliminary action enables complex geometric structures to be produced without requiring additional support systems.

The patent uses a liquid binder solution instead of powder binders, applying it through a printing mechanism that deposits the liquid uniformly across the powder layer. The liquid binder penetrates and binds the powder particles together, eliminating segregation issues that occur with powder binders. This hydraulic approach ensures homogeneous distribution of binder and powder, producing uniform green bodies with consistent composition throughout.