Digital light processing which is with polycrystalline alumina ceramics powder additive for 3D printing material

Ceramic materials are difficult to process due to their high hardness and brittleness. Traditional molding processes (such as injection molding, grouting molding, and extrusion molding) have high mold costs and long production cycles. The light-curing molding technology has the advantages of no mold, short production cycle, and high precision. It is one of the most promising molding technologies for preparing high-precision micro-ceramic devices. In addition to micro-ceramic nozzles, gears and other devices, it is more suitable for dentures and artificial joints. and other customized ceramic devices with complex surfaces.

The ceramic light-cured slurry prepared by the present invention can obtain various complex geometric shapes that are difficult to achieve by other forming methods, and quickly produce hundreds of optical or non-optical ceramic components with complex shapes and sizes (Figure 1). After sintering, the printed green body shrinks evenly and is not easily deformed (Figure 2). The microstructure of the alumina sintered body is dense and the grain size is uniform (Figure 3).

The present invention overcomes the problems of difficult dispersion of photosensitive resin and large shrinkage rate during the printing process, and the surface of the 3D printed product has a ceramic color, just like the texture and touch of real ceramics. In addition, the raw material of the photosensitive ceramic slurry is alumina powder prepared from waste aluminum electrolyte, which is domestically produced and will not be restricted by foreign countries, and is in line with the circular economy of resource regeneration.