2results about How to "Small sintering shrinkage" patented technology

The application discloses a preparation method of a multilayer composite crosslinking ceramic flow-casting green tape, which comprises the following steps: inputting slurry into multiple interval-mounted material boxes of a flow-casting machine, making the carrier tape pass through the material boxes and making the slurry in the material boxes be stacked on the carrier tape layer by layer to be flow-cast into a multilayer composite crosslinking flow-casting green tape; the slurry comprises silicon nitride ceramic powder, a sintering aid, a solvent, a binder, a dispersing agent, a plasticizer and a crosslinking agent; the plasticizer is at least one of cashew phenol Mannich tiglic acid ester, dibutyl phthalate, dimethyl phthalate and polyethylene glycol, and the dispersing agent is at least one of fish oil, castor oil and polyvinylpyrrolidone. The obtained green tape is uniform, smooth and flat, free of cracks, wrinkles and bubbles, has good toughness and high strength, is not easy to deform, and has adjustable thickness, and the problem that a crosslinking system ceramic green tape is difficult to flow thick is solved.

The invention relates to a photocuring 3D printing high-precision ceramic core and a preparation method thereof, and relates to the technical field of additive manufacturing ceramic materials. The preparation method of the photocuring 3D printing ceramic core comprises the following steps: preparing a photocuring ceramic slurry from ceramic mixed powder, photocuring resin, a dispersing agent and an initiator; wherein the ceramic mixed powder is prepared from the following components in percentage by mass: 60 to 90 weight percent of framework powder, 5 to 25 weight percent of filler and 5 to 15 weight percent of shrinkage compensation agent; wherein the shrinkage compensation agent is selected from one or more of kyanite, sillimanite and andalusite; the photocuring ceramic slurry is subjected to photocuring 3D printing treatment, and a photocuring ceramic core biscuit is obtained; and sequentially carrying out degreasing treatment and sintering treatment on the photocuring ceramic core biscuit to obtain the photocuring 3D printing ceramic core. According to the invention, the bending strength of the ceramic core can be improved while the small sintering shrinkage rate of the ceramic core is ensured to improve the dimensional precision of the ceramic core.