Aluminium borate composite porous ceramics and its preparation method

Abstract

The invention relates to an aluminium borate composite porous ceramic and method for preparation, which comprises mixing aggregate with mixed powder by the weight ratio of 20-90 / 10-80, charging 1-6 wt% anchoring agent, mixing and forming, drying 20-30 hours at 90-120 deg. C, elevating temperature to 200-500 deg. C then thermally insulating 20-280 minutes, then elevating temperature to 700-1700 deg. C then thermally insulating 30-600 minutes, naturally cooling, wherein the process for preparing the mixed powder comprises, mixing fines containing aluminium compounds with boracic acid powder, thus obtaining AlxByOz, wherein x=16-22, y=2-5, z=30-36. The fines comprise Al2O3, Al2O3.3H2O and Al2O3.H2O by the proportion of 0-70 wt%, 0-80 wt% and 0-70 wt%.

Description

1. Technical field

[0001] The invention belongs to the technical field of porous ceramics, in particular to an aluminum borate composite porous ceramic and a preparation method thereof. 2. Background technology

[0002] Because porous ceramics have the advantages of low density, high permeability, corrosion resistance, good heat insulation performance, high temperature resistance and long service life, they can be used as high temperature gas filters, solid particle filters, molten metal filters for It is used in high temperature equipment that requires chemical corrosion resistance and good permeability, as well as a separator for physical separation, a catalyst carrier for treating waste from chemical plants and automobile exhaust, etc. They can also be used as refractory materials, heat insulation materials, sensors, thermistors and porous piezoelectric ceramics, heat exchangers, etc. In addition, they also have potential applications in the biomedical field. In short, ...