Porous ceramics and methods for their preparation
A technology of porous ceramics and ceramics, applied in the field of ceramics, can solve the problems of low porosity and unstable structure of porous ceramics, and achieve the effects of low cost, fast forming speed and high porosity
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Embodiment 1
[0023] Porous ceramics, including ceramic chopped fibers and ceramic microbeads, the ceramic chopped fibers and the ceramic microbeads, the ceramic chopped fibers and the ceramic chopped fibers, the ceramic bead and the ceramic microbeads The beads are all sintered with each other to form a porous structure.
[0024] Pores can be formed between the ceramic microbeads, between the ceramic microbeads and the ceramic chopped fibers, and between the ceramic chopped fibers, so that the porosity can be effectively guaranteed.
[0025] The ceramic chopped fiber realizes the function of the connecting rod, and the ceramic chopped fiber and ceramic microspheres are sintered together to form a stable structure.
[0026] The diameter of the ceramic microbeads is not more than 0.08mm.
[0027] The porosity of porous ceramics is 40-80%.
Embodiment 2
[0029] On the basis of the first embodiment above, the ceramic chopped fibers and the ceramic microbeads form a layered grid layer with isotropy, and the porous ceramic is obtained by superimposing and sintering no less than two grid layers. formed, and the ceramic chopped fibers and the ceramic microbeads between the mesh layer and the mesh layer, the ceramic chopped fibers and the ceramic chopped fibers, the ceramic microbeads and the The ceramic microbeads are all sintered together.
[0030] Each layer has isotropy, effectively ensuring the stability of the structure.
[0031] The layer device structure is formed by brushing, and each layer is brushed in the same direction during brushing, so as to ensure that the ceramic chopped fibers and ceramic microbeads in each layer can have isotropy.
[0032] There is an included angle between the mesh layers, and the angle of the included angle is 30-90°. The mesh layer has an included angle to form a staggered structure, and the ...
Embodiment 3
[0035] On the basis of the first or second embodiment above, the porous ceramics are prepared from the following materials in parts by mass: 15 to 32 parts of ceramic chopped fibers, 1 to 3 parts of ceramic microbeads, and 0 to 2 parts of sintering aids. 40-80 parts of photosensitive resin, 0.05-0.1 parts of defoamer, and 1-3 parts of dispersant.
[0036] The ceramic chopped fibers are one or more of alumina fibers, mullite fibers, cerium oxide fibers, zirconia fibers, and aluminum silicate fibers.
[0037] The sintering aid is one or more of silicon oxide, aluminum oxide, yttrium oxide, cerium oxide, zirconia, magnesium oxide, calcium oxide; the defoamer is polydimethylsiloxane, fatty alcohol 1. One or more of polyether modified silicone oils; the dispersant is one or both of ammonium polyacrylate and polyethylene glycol.
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Abstract
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