2results about How to "Exclude smoothly" patented technology

This invention relates to the field of 3D printing technology, and provides a venting insert, a mold, a mold system, and a method for 3D printing the venting insert. The venting insert includes: an insert body, which is at least made of permeable steel and is suitable for placement within the cavity of the mold. The insert body has a composite layer structure, comprising at least a first layer of permeable steel and a second layer of permeable steel. The first layer of permeable steel is laid on top of the second layer of permeable steel, and venting passages are formed at least in the first layer of permeable steel. The venting passages in the first layer of permeable steel provide unidirectional ventilation, facilitating the smooth removal of gas from the venting insert through the unidirectional holes and preventing defects on the product surface caused by the venting holes. Simultaneously, the venting passages in the first layer of permeable steel achieve multidirectional venting, allowing gas discharged through the unidirectional holes in the first layer of permeable steel to also be smoothly vented through the multidirectional holes in the second layer of permeable steel.

The application discloses a gradient sintering process for improving the elimination rate of closed porosity of ceramic, and belongs to the technical field of alumina ceramic manufacturing. The process adds lanthanum aluminum oxide core-shell powder as a sintering additive and switches from an air atmosphere to an oxygen atmosphere during sintering and glue removal, realizes gradient sintering, can greatly eliminate closed porosity, improves the density and mechanical strength of ceramic materials, and makes the ceramic materials less likely to crack. The sintering additive is lanthanum aluminum oxide core-shell powder, the structure is a core-shell structure with lanthanum oxide as a shell layer and gamma-alumina as a core layer, lanthanum oxide can reduce the concentration of lattice cation interstitials or produce a grain boundary drag effect, thereby controlling the growth rate of the crystal grains, ensuring the smooth removal of pores, and under oxygen calcination, the concentration of cation interstitials in alumina and lanthanum oxide can be increased, the grain boundary mobility can be controlled to a certain extent during the sintering densification process, and the formation of closed pores is further reduced.