Mn-Co-doped spinel composite nanometer material and low-temperature sintering method thereof

A technology of composite nanomaterials and low-temperature sintering, which is applied in the direction of nanostructure manufacturing, nanotechnology, nanotechnology, etc., can solve the problems of expensive film formation methods, difficulty in preventing the diffusion and volatilization of Cr oxides, difficulty in sintering and compaction, etc., and achieve high-temperature conductivity performance effect

Active Publication Date: 2010-03-17
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
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Problems solved by technology

At the same time, due to the thinner coating film, it is difficult to prevent the further diffusion and volatilization of Cr oxides.
The second type of perovskite structure materials has relatively high electronic conductivity, but because these materials are difficult to sinter and compact at low sintering temperatures (such as ≤1000 ° C), more expensive film-forming methods must be used

Method used

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  • Mn-Co-doped spinel composite nanometer material and low-temperature sintering method thereof
  • Mn-Co-doped spinel composite nanometer material and low-temperature sintering method thereof
  • Mn-Co-doped spinel composite nanometer material and low-temperature sintering method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1 nanometer powder material Mn 0.9 Y 0.1 co 2 o 4 Preparation and low temperature sintering method

[0034] 1. Preparation of nano-powder material Mn by sol-gel method 0.9 Y 0.1 co 2 o 4 : (i) the nitrate of Y, Mn and Co is dissolved in deionized water at a ratio of 0.1:0.9:2 in the molar ratio of Y ions, Mn ions and Co ions, wherein Y ions, Mn ions and Co ions total The molar concentration is 1mol / L; add citric acid and ethylene glycol that are 3 times the total molar weight of Y ions, Mn ions and Co ions, mix and stir evenly, wherein the molar ratio of citric acid to ethylene glycol is 2:1; The solution was heated and volatilized at 75°C to form a sol; (ii) the above sol was further dried in an oven at 180°C to expand and solidify into a xerogel; (iii) the xerogel was calcined at 700°C, and then further dried in an oven without Ball milling in water and ethanol and drying to obtain Mn 0.9 Y 0.1 co 2 o 4 Powder material.

[0035] The above-prepa...

Embodiment 2

[0039] Embodiment 2 nanometer powder material Mn 0.8 Y 0.2 co 2 o 4 Preparation and low temperature sintering method

[0040] The difference between this example and Example 1 is that the acetates of Y, Mn and Co are dissolved in deionized water at a molar ratio of Y ions, Mn ions and Co ions at a ratio of 0.2:0.8:2. Other steps are the same as Embodiment 1.

Embodiment 3

[0041] Embodiment 3 nanometer powder material Mn 2 co 0.9 Y 0.1 o 4 Preparation and low temperature sintering method

[0042] 1. Preparation of nano-powder material Mn by combustion method 2 co 0.9 Y 0.1 o 4 : (i) the acetate of Y, Mn and Co is dissolved in deionized water at a ratio of 0.1: 2: 0.9 in the molar ratio of Y ions, Mn ions and Co ions; add 2 times the amount of Y ions, Mn ions and Glycine with the total molar amount of Co ions is mixed and stirred evenly; (ii) the above solution is heated and volatilized in an electric furnace to form a gel until it is burned to obtain a precursor; (iii) the precursor is calcined at 750 ° C, and then further in anhydrous Ball milling in ethanol and drying to obtain Mn 2 co 0.9 Y 0.1 o 4 Powder material.

[0043] 2. Low-temperature sintering process: the above-prepared Mn 2 co 0.9 Y 0.1 o 4 The powder material is subjected to reduction treatment at 650°C in a carbon monoxide atmosphere, pressed into tablets after co...

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Abstract

The invention provides an Mn-Co-doped spinel composite nanometer material and a low-temperature sintering method thereof. The spinel material has the following chemical composition: Mn<1-m>(R)m<1+x>Co<2-x>O4 or Mn<1+x>Co<1-n>(R)n<2-x>O4, wherein x is less than or equal to 1 and more than or equal to 0, m is more than 0 and less than or equal to 0.2, n is more than 0 and less than or equal to 0.2,and R is one or a plurality of rare earth metal elements. The material can serve as high temperature oxidation resisting conductive coating material of a solid oxide fuel cell (SOFC) alloy connectingboard or serve as high temperature oxidation resisting conductive coating material under other similar environments. Meanwhile, the invention initiates a low-temperature sintering method of spinel material, the spinel powder material which can be reduced is firstly reduced, tabletted and sintered, sintered blocks show higher sintering activity and obviously high conductivity at lower temperature,and the outstanding characteristic can be used for preparing high-density non-noble metal high temperature oxidation resisting conductive elements.

Description

technical field [0001] The invention relates to a low-temperature sintering method of a spinel composite nanomaterial and its application, in particular to a doped Mn-Co spinel composite nanomaterial, its low-temperature sintering method and its application, and belongs to the field of energy materials. Background technique [0002] As a new energy technology, fuel cells have many advantages such as high efficiency, cleanliness, safety and reliability. In addition to the common advantages of fuel cells such as high efficiency and environmental friendliness, solid oxide fuel cells (SOFC) make their design more flexible, more convenient to operate, and safer and more reliable due to their all-solid-state characteristics. Among them, plate-type SOFC has the advantages of compact structure, high volume power density, and relatively simple preparation process, and has become the mainstream of SOFC research and development at home and abroad. With the reduction of SOFC operating ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B82B1/00B82B3/00H01M8/02H01M4/86H01M8/10H01M8/0228
CPCY02E60/521Y02E60/50
Inventor 辛显双王绍荣徐延杰温廷琏
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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