Method for manufacturing silicon carbide ceramic special-shaped part with complex shape by plastic fused deposition modeling (FDM)-3D printing based on water debinding

A method for manufacturing a silicon carbide ceramic part by plastic fused deposition modeling (FDM)-3D printing based on water debinding, comprising:

• mixing graphite, carbon black, silicon carbide, and a surface modifier, and subjecting a resulting mixture to modification to obtain a surface modifier-coated composite ceramic powder;
• subjecting the surface modifier-coated composite ceramic powder, a macromolecular binder and a water-soluble binder to internal mixing, and then subjecting a resulting mixed material to crushing or granulation to obtain a ceramic 3D printing feed, wherein the macromolecular binder comprises a high-strength engineering plastic, a high-toughness engineering plastic, and a thermoplastic elastomer, and the water-soluble binder comprises a polyethylene glycol (PEG);
• the high-strength engineering plastic has a bending strength greater than or equal to 50 MPa, the high-toughness engineering plastic has a fracture toughness greater than or equal to 50 MPa·m1/2, and the PEG comprises a high-molecular-weight PEG and a low-molecular-weight PEG;
• and the low-molecular-weight PEG has a weight-average molecular weight less than or equal to 1,000, and the high-molecular-weight PEG has a weight-average molecular weight greater than 1,000;
• and
• subjecting the ceramic 3D printing feed to FDM-3D printing, water debinding, and reaction sintering in sequence to obtain the silicon carbide ceramic part.