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Method for preparing proton conductor ceramic by low-temperature densification

A proton conductor and densification technology, which is applied in the field of preparation of proton conductor ceramics, can solve the problems of high cost, uneven distribution of sintering aids, element segregation, etc., and achieve the goal of reducing production cost, possibility, and element segregation Effect

Inactive Publication Date: 2012-07-18
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the problems of uneven distribution of sintering aids, element segregation, and high cost in the existing method of adding micron-scale sintering aids to lower the sintering temperature, and proposes a low-temperature densification method for preparing proton conductor ceramics

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specific Embodiment approach 1

[0016] Specific implementation mode 1: This implementation mode is a method for preparing proton conductor ceramics by low-temperature densification, which is specifically completed according to the following steps:

[0017] 1. According to the general structural formula M m Ce x Zr y R z o 3-δ , according to the ratio of M element, Ce element, Zr element and R element in molar ratio of m:x:y:z, weigh the nitrate raw materials, and then synthesize them by sol-gel method to obtain a gel-like synthetic product. The colloidal synthetic product is baked at a constant temperature of 150°C to 250°C for 8h to 12h to obtain a black powder, and finally the black powder is calcined at 1000°C to 1200°C for 4h to 8h to obtain M m Ce x Zr y R z o 3-δ Powder; 2. First, M m Ce x Zr y R z o 3-δ The powder is impregnated, and then filtered to obtain impregnated M m Ce x Zr y R z o 3-δ powder; 3. Firstly, the impregnated M m Ce x Zr y R z o 3-δ The powder is heat-treated ...

specific Embodiment approach 2

[0021] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the sol-gel method described in the step 1 is specifically completed according to the following steps: first nitrate raw materials are added in the EDTA-ammonia solution, Then add citric acid to form a mixed solution, and heat it under the condition of a constant temperature water bath with a stirring speed of 80 rpm to 250 rpm and 70 °C to 90 °C until a gel is formed to obtain a gel-like synthetic product; In the EDTA-ammonia solution added, the ratio of EDTA mole to the total mole of metal ions in the mixed solution is (1~2): 1; wherein the mol ratio of the citric acid added and the total mole of metal ion in the mixed solution is ( 1~2):1. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0022] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the dipping treatment described in step two is specifically completed according to the following operations: the M m Ce x Zr y R z o 3-δ The powder is completely immersed in the impregnating solution for 1min to 30min. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a method for preparing a proton conductor ceramic by low-temperature densification, relating to the method for preparing the proton conductor ceramic and solving the problems of non-uniform distribution of sintering additives, element segregation and high cost in the traditional method of reducing the sintering temperature by adding the micron sintering additives. The method comprises the steps of: at first, preparing an MmCexZryRzO3-delta powder body, then soaking and heating in sequence to obtain the MmCexZryRzO3-delta powder body with metal oxide sintering additives, finally sintering to obtain the proton conductor ceramic. The method has the advantages that: 1, the distribution uniformity of the sintering additives is improved and the possibility of the element segregation is reduced; 2, a soaking solution contains additives for improving the distribution uniformity of the sintering additives in the powder body; and 3, the sintering temperature and the preparation and production costs are reduced. The method is mainly applied to the preparation of the proton conductor ceramic.

Description

technical field [0001] The invention relates to a preparation method of proton conductor ceramics. Background technique [0002] Composite oxide proton conductors with perovskite and related structures are an important class of functional conductive ceramics, which have broad application prospects in solid oxide electrolytic cells, hydrogen permeable membranes, and hydrogenation reactors. Among them, a solid oxide fuel cell (Solid Oxide Fuel Cell, SOFC) is a power generation device that operates at a high temperature of 500°C to 1000°C and can directly convert the chemical energy of the fuel into electrical energy. Its outstanding advantages: 1. High efficiency, the power generation efficiency is 50%, and the total efficiency can reach 80% in combined heat and power supply; 2. Environmentally friendly, SO 2 and NO x Very low emissions. Therefore, SOFC is known as the green power source in the 21st century, and it is vigorously developed by governments of various countries...

Claims

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Application Information

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IPC IPC(8): C04B35/48C04B35/50C04B35/505C04B35/622C04B35/63
Inventor 魏波吕喆关波徐玲玲黄喜强张耀辉苏文辉
Owner HARBIN INST OF TECH
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