Porous ceramic negative pressure slip casting device and method for preparing ceramic blank

Abstract

The invention discloses a porous ceramic negative pressure slip casting device and a porous ceramic negative pressure slip casting method for preparing a ceramic blank, and belongs to the field of transparent laser ceramic preparation technology. The device comprises a vacuum chamber, a microfiltration membrane and a concave support, and is characterized in that the concave support is cylindrical; the upper end of the concave support is provided with a cylindrical concave groove; the upper end of the vacuum chamber is provided with a cylindrical shrinkage port, while the lower end is closed and frustum-shaped; the middle position of the upper half end of the vacuum chamber is provided with an air extraction hole which is connected with a vacuum pump; the microfiltration membrane is cylindrical, the upper end of the microfiltration membrane is open and the lower end and the periphery of the microfiltration membrane are provided with filtration membranes; the microfiltration membrane is attached to the concave groove on the concave support, so the microfiltration membrane can be placed in the concave groove of the concave support to form a blank space together; and the upper edge of the concave support is adhered and hermetically fixed with an inner lower circular plane of the shrinkage port at the upper port of the vacuum chamber through an adhesive. The forming method comprises the steps of preparing YAG nanopowder, preparing slurry and performing slip casting. The method has the advantages of simple steps, convenient operation and easy realization of high-density blank.

Description

technical field [0001] The invention relates to a porous ceramic negative pressure grouting molding device and method for preparing a ceramic body, in particular to the molding process in the process of preparing YAG transparent ceramics, and to the preparation technology of slurry, belonging to the technical field of transparent laser ceramic preparation . Background technique [0002] YAG is the abbreviation of yttrium aluminum garnet, its chemical formula is Y 3 Al 5 o 12 , by Y 2 o 3 and Al 2 o 3 A complex oxide co-solution is formed, which belongs to the cubic crystal system and has a garnet structure. YAG has excellent optical properties and stable chemical properties. Its rare earth-doped single crystal crystal has been widely used in laser technology, and it is the most widely used laser crystal in all solid-state lasers. However, due to the shortcomings of single crystals such as doping concentration limitations and growth size limitations, with the improvem...

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Problems solved by technology

[0005] The mold is a gypsum mold, and surface ion exchange will occur during the molding process, causing calcium ions in the gypsum to enter the ceramic body, which may generate calcium-containing phases that affect the optical and laser properties of transparent ceramics, although the surface is ground to a certain extent Calcium ions can be mitigated, but still adversely affect ceramics

[0006] In addition, during the grouting molding process, because the micropores in the gypsum mold have limited water absorption capacity for the slurry, the initial stage absorbs water strongly, and the water absorption speed decreases in the later stage of molding, so it takes a long time to dry the molding and is easy to Causes uneven density in the center and edges of the green body

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