A kind of preparation method and application of zirconia porous ceramic material

Abstract

The invention provides a preparation method and application of a zirconium dioxide porous ceramic material. The technological process comprises the steps of 8YSZ ceramic slurry suspension preparation,alcohol-based gel injection molding, freeze drying, degreasing and high-temperature heat treatment. Due to small surface tension of tert-butyl alcohol, isopropanol and the like, shrinkage of a samplein the drying process can be inhibited by combining an alcohol-based gel casting technology and a freeze drying technology, so that the high-porosity porous ceramic is prepared. The density of the prepared ZrO2 porous ceramic is 0.67-1.02 g / cm<3>, the porosity is 83-89%, the compressive strength is 3-6 MPa, and the room-temperature thermal conductivity is 0.04-0.1 W / (m.K).

Description

technical field

[0001] The invention belongs to the field of thermal insulation materials, and in particular relates to a preparation method of zirconia porous ceramics and a prepared product. Background technique

[0002] Aerospace vehicles and engineering structural materials (such as turbine blades, jet engines, etc.) require special materials for protection in harsh environments. These protective layer materials not only protect the protected materials from corrosion, wear and erosion, but also play a role of heat insulation. Especially when these protective layer materials are used as heat-resistant structures, they are subjected to extreme high temperature, high pressure and thermal cycle environments. At present, the main materials used in the protective layer are: Al 2 o 3 、TiO 2 、CaO / MgO+ZrO 2 , Yttria Stabilized Zirconia (YSZ), CeO 2 +YSZ, ZrO 2 , La 2 Zr 2 o 7 , mullite, etc. Among them, 8YSZ ceramic materials are widely used because of their advantages...

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