Honeycombed porous ceramic having high thermal conductivity and ultralow expansion coefficient

Abstract

A honeycombed porous ceramic having a high thermal conductivity and an ultralow expansion coefficient relates to the technical field of the silicate industry. The ceramic having a low even negative thermal expansion coefficient and a high thermal conductivity is obtained through treating a rare earth mixture, potassium phosphotungstate, zirconium oxide and amorphous quartz particles as a sintering aid, and expansion coefficient and thermal conductivity adjustment agents, and the ceramic has a high-orientation sheet iolite structure and has a good catalyst coating performance and good mechanical strengths; and ethylene oxide having different molecular weights are adopted as a ceramic molding binder, rapeseed oil or peanut oil is treated as a primary molding lubrication agent, a paste goes through a high-pressure extruder orientation extruding channel, a crystal orientation carding die and a honeycombed porous die to obtain a green body having high-orientation arranged crystals, and a special sintering curve is adopted to obtain the ceramic. The above whole ceramic preparation process flow and the above formula are economic, stable and environmentally-friendly.

Description

technical field [0001] The invention relates to the technical field of silicate industry, in particular to the field of ceramic production and preparation. The ceramics produced by this technology are mainly used in chemical industry and internal combustion engine gas catalytic support body, gas filtration, regenerator material, wear-resistant material, bulletproof armor material, etc. aspect. Background technique [0002] Honeycomb porous ceramics is a porous ceramic product with a honeycomb-like structure and has a wide range of uses. Among them, the fields of large usage are automobile exhaust purification and desulfurization and denitrification catalyst supports, such as publication numbers CN1457920, CN1413769, CN1401416, CN102424569A, etc. Chinese patents all disclose related technologies of porous ceramics. [0003] When honeycomb porous ceramics are used as various catalyst supports or high-temperature gas filter materials, they need to cope with rapid temperature c...

AI Technical Summary

Problems solved by technology

Some Chinese patents such as CN101074161, CN102399082A, CN101374786, CN101565324 propose to adopt methods such as ball milling, multiple mud refining, and stale to homogenize the mud. Although these methods can play a role in homogenizing the mud to a certain extent, they bring many disadvantages, such as Ball milling destroys the particle size distribution and the chain length of organic additive polymers, and the use of simple mixing and multiple mud refining cannot completely effectively open the mineral agglomerated particles and mix them evenly, and also destroys the chain length of organic additive polymers, etc.

[0005] And the Chinese patents CN102365119A, CN101460230, CN101374786, CN101646637 and many domestic and foreign documents have proposed the manufacturing method of cordierite honeycomb porous ceramics, all of which are extrusion molding, although extrusion molding can be beneficial to the orientation of mineral crystals and help to form a highly directional arrangement The cordierite crystals are beneficial to reduce the cordierite honeycomb porous ceramics, but the above-mentioned patents lack the process, technology and process of how to make the mineral crystals highly oriented.

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