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Method for preparing zirconium oxide porous ceramics by foam-gel casting method

A technology of porous ceramics and zirconia, applied in the field of ceramics, can solve the problems of poor thermal insulation performance and high thermal conductivity of coatings, and achieve the effects of excellent mechanical properties, high strength, high strength and thermal conductivity

Inactive Publication Date: 2019-01-04
江西鸿司远特种泡沫材料有限公司
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Problems solved by technology

CN101307424A discloses a preparation process of zirconia coating, which uses arc ion plating technology to reactively deposit zirconia coating. The zirconia coating has a dense structure, so the coating has high thermal conductivity and poor heat insulation performance

Method used

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Embodiment 1

[0019] A method for preparing zirconia porous ceramics by foam injection method, comprising the following steps:

[0020] 1) Weigh a certain amount of deionized water, acrylamide, N,N'-methylenebisacrylamide and ammonium polyacrylate, and prepare a premixed solution in a ratio of 75:10:10:5;

[0021] 2) Weigh a certain amount of zirconia raw material powder containing 8% yttrium oxide and the premixed solution in step 1) and pour it into a roller ball mill for mixing and ball milling for 18 hours to obtain a slurry at a ball milling speed of 80 rpm, wherein the particle size of zirconia is 0.5 μm , wherein the solid content of zirconia is 30vol.%;

[0022] 3) After the ball milling, pour the uniformly mixed slurry after ball separation into the mixing tank, and add a certain amount of sodium lauryl sulfate into the mixing tank, stir rapidly for 10 minutes, and then add a certain amount of N, N,N',N'-Tetramethylethylenediamine, after rapid stirring for 5 minutes, slowly add a ...

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Abstract

The invention provides a method for preparing zirconium oxide porous ceramics by a foam-gel casting method. According to porous ceramic semi-finished product bodies prepared by the foam-gel casting method, the distribution and the structure of gas holes are uniform, the strength is high, and the porosity can reach 90%; due to foaming, gas is introduced, and a sintering and glue discharging processis introduced, gas opening holes and gas closing holes exist in test samples at the same time, and the obtained samples have a favorable gas hole structure and excellent mechanical properties; and the zirconium oxide porous ceramics prepared by the foam-gel casting method have the characteristics of being high in strength and low in heat conduction rate, the total porosity of the zirconium oxideporous ceramics can reach 78%, the compressive strength of the zirconium oxide porous ceramics is close to 30MPa, and the heat conductivity of the zirconium oxide porous ceramics can reach 0.39W / (m.K).

Description

technical field [0001] The invention relates to the field of ceramics, in particular to a method for preparing porous zirconia ceramics by a foam casting method. Background technique [0002] With the advancement of science and technology, the development of aerospace and civil vehicles, the temperature requirements for the hot end parts are getting higher and higher. The current superalloy materials and single crystal materials can no longer meet the requirements for the use of hot end parts. Thermal barrier coatings combine the high strength and toughness of metals with the high temperature resistance of ceramics. It has good heat insulation, thermal fatigue resistance, high temperature oxidation resistance and corrosion resistance. It has been used in combustion Materials for hot-end parts such as steam turbines and turbine blades have been widely used, and the service life of hot-end parts at high temperatures has been effectively extended, thus effectively solving the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/06C04B35/48C04B35/622
CPCC04B35/48C04B35/622C04B38/067C04B2235/6562C04B2235/6565C04B2235/96C04B2235/9607C04B38/0074
Inventor 王宏德
Owner 江西鸿司远特种泡沫材料有限公司
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