Improved coating method for preparing membrane of oxide ceramics

A technology of oxide ceramics and oxides, which is applied in the field of oxide ceramic film preparation, can solve the problems of difficult control of film thickness uniformity, too thick slurry concentration, poor slurry fluidity, etc., and achieve high output power density , High raw material utilization rate, stable performance effect

Inactive Publication Date: 2006-12-06
HARBIN INST OF TECH
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Problems solved by technology

[0003] Among the above two methods, the coating process is relatively simple. Since high-concentration slurry can be used, the initial density of the membrane blank is high, but the fluidity of the slurry is poor. The coating process requires a certain amount of pressure to assist manual control. The uniformity of film thickness is diff

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  • Improved coating method for preparing membrane of oxide ceramics

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specific Embodiment approach 1

[0015] Specific implementation mode 1: This implementation mode adopts the following technical scheme to prepare oxide ceramic membranes:

[0016] 1. Preparation of the support body: the support body is composed of a mixture of various oxides. The support body used for the oxide electrolyte film of the solid oxide fuel cell is a powder of a transition metal oxide micron or submicron particle size and another A mixture of oxide solid solution solid electrolyte powder and organic pore-forming agent. Transition metal oxide refers to a mixture of one or two of nickel oxide, cobalt oxide, copper oxide, and iron oxide; oxide solid solution electrolyte refers to elements doped with yttrium, scandium, calcium, or magnesium (accounting for 3 to 15 mol%) Miscellaneous zirconia with cubic or tetragonal structure, or rare earth (one or more of Y, Sm, La, Pr, Nd, Gd, etc.) or alkaline earth (Ca and / or Sr) doped cerium oxide; The pore agent is flour, starch, activated carbon or graphite po...

specific Embodiment approach 2

[0023] Specific Embodiment 2: In this embodiment, the fabrication of a support for an oxide electrolyte membrane used in a solid oxide fuel cell is taken as an example. The raw materials are nickel oxide (NiO) nanopowder synthesized by glycine-nitrate method, yttria stabilized zirconia (YSZ) electrolyte ceramic powder, and flour for pore forming agent. The mass ratio of these three raw materials is 5:5:1.7 After the ingredients are fully mixed and ground, they are placed in a mold and pressed at 150-200MPa to form a disc with a thickness of 0.6mm, and then placed in a high-temperature electric furnace, and the temperature is raised to 1000°C at a heating rate of 2°C / min-10°C / min , and sintered for 2 hours to obtain a NiO-YSZ anode support body for solid oxide fuel cell electrolyte membrane preparation.

specific Embodiment approach 3

[0024] Specific Embodiment Three: This embodiment takes the fabrication of a support for an oxide electrolyte membrane used in a solid oxide fuel cell as an example. The raw materials are nickel oxide nano-powder synthesized by precipitation method, samarium oxide-doped cerium oxide (SDC) electrolyte ceramic powder, and flour for pore-forming agent. These three raw materials are mixed and ground in a mass ratio of 5:5:2. Finally, put it in a mold and press it into a disc with a thickness of 0.5mm at 150-200MPa, then place it in a high-temperature electric furnace, raise the temperature to 1000°C at a rate of 2°C / min-10°C / min, and sinter for 2 hours. That is, the NiO-SDC anode support body used for the preparation of solid oxide fuel cell electrolyte membrane is obtained.

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Abstract

This invention relates to an improved coating method for preparing oxide ceramic membrane. The method comprises: (1) preparing a support; (2) preparing a slurry of the raw materials; (3) coating the slurry onto the support; (4) spin-coating and leveling; (5) drying the membrane blank; (6) repeating the steps 3-5; (7) calcining at a high temperature. The method is convenient and rapid, and has such advantages as high raw materials utility and good membrane quality. The zirconium oxide electrolyte membrane thus prepared can be used to prepare solid oxide cells with high output power density and stable performance.

Description

technical field [0001] The invention relates to a preparation method of an oxide ceramic film. Background technique [0002] Generally, oxide ceramic membranes can be prepared by many methods such as coating method, screen printing, sol-gel method, electrophoretic deposition method, dry pressing method, filter coating method, and slurry spin coating method. The background technology directly related to the present invention is the slurry coating method and the slurry spin coating method: the slurry coating method is to directly coat the viscous suspension slurry containing a certain concentration of ceramic powder on the support body to form a membrane base ; And the slurry spin coating method is to drop the suspension slurry with certain fluidity on the support substrate, and the support substrate is sucked on the glue homogenizer, and the glue homogenizer drives the substrate and the slurry droplets on it Rotating at high speed, the centrifugal force is used to rapidly sp...

Claims

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Application Information

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IPC IPC(8): C04B35/622C04B41/87C04B35/01
Inventor 吕喆王嘉明陈孔发艾娜胡金艳黄喜强苏文辉
Owner HARBIN INST OF TECH
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