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Ceramic materials

A technology of ceramics and composite materials, which is applied in the field of high-temperature electrochemical conversion devices to achieve the effect of reducing the level of residual stress and improving reliability

Pending Publication Date: 2021-11-23
COORSTEK MEMBRANE SCI AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the technical challenges associated with firing silver-containing powder mixtures at temperatures about 200 °C above the melting point of silver have not been resolved, in particular how to avoid dewetting and separation of the two phases

Method used

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preparation example Construction

[0099] Preparation of glass-ceramic / silver composites

[0100] The present invention provides a method of producing glass-ceramic / silver composite material, said method comprising the following steps:

[0101] A glass-ceramic / silver composite precursor composition as described herein is heated above the glass transition temperature (T g ) but below the melting point of the silver-based particles; and

[0102] The temperature is maintained within the range for a duration sufficient to effect sintering and crystallization of the glass-ceramic precursor composition.

[0103] Initially, as the glass-ceramic / silver composite precursor composition is gradually heated above the T of the glass-ceramic precursor composition g , the material starts to sinter. The glass-ceramic / silver composite precursor composition is densified primarily by viscous sintering of the glass-ceramic precursor phase with increasing temperature. The glass-ceramic precursor phase should remain amorphous-cr...

example

[0128] By way of example, a number of conductive glass-ceramic / silver composites ("GC / Ag composites") according to the present invention were prepared as listed below. GC / Ag composites were made with glass-ceramic matrices from a range of different alkaline earth silicate and alkaline earth aluminosilicate systems. These were chosen to show that composites can be produced from a variety of precursor glass compositions.

[0129] Preparation and Characterization of Glass-ceramic Precursors

[0130] The compositions of the precursor glasses are presented in Table 1.

[0131] Table 1

[0132]

[0133] Glass batches sufficient to produce 800 g of each glass are prepared by mixing high-purity raw materials such as magnesium, calcium and barium carbonates, zinc oxide, aluminum oxide, quartz, zirconium dihydrogen phosphate and ammonium dihydrogen phosphate in appropriate proportions . Glass batches are melted in zirconia grain stabilized (ZGS) platinum crucibles at temperatures...

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Abstract

The present invention relates to glass-ceramic / silver composite precursor compositions in the form of powders, and to glass-ceramics / silver composite materials produced therefrom. Such materials find particular use as interconnect materials for high temperature electrochemical conversion devices such as solid oxide fuel cells (SOFCs) and solid oxide electrolysis cells (SOECs).

Description

technical field [0001] The present invention relates generally to the field of glass-ceramic / silver composites, and in particular to interconnects for high temperature electrochemical conversion devices, such as solid oxide fuel cells (SOFC) and solid oxide electrolysis cells (SOEC) Material. It also relates to such devices incorporating glass-ceramic / silver composite interconnect materials. Background technique [0002] Solid oxide fuel cells (SOFCs) are well known devices that oxidize fuels to generate electricity directly. Solid oxide electrolysis cells (SOECs) are related to SOFCs, but instead of generating electricity via fuel oxidation, they use electrical energy to produce hydrogen and oxygen via steam electrolysis. The individual cells in a SOFC stack (and SOEC stack) are connected in series, with each cell separated from adjacent cells by conductive interconnects (referred to herein as "interconnects"). Interconnects are typically plate-like assemblies that provi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0226H01M8/2425H01M8/1231C03C3/04C03C10/00C03C14/00H01M8/124
CPCH01M8/0226H01M2300/0068H01M2008/1293H01M8/2425H01M8/1231C03C10/0009C03C10/0045C03C14/006C03C3/095C03C3/097C03C3/078C03C3/087C03C10/0036C03C8/18C03C2214/08H01M8/0215
Inventor 迈克尔·伊恩·巴德
Owner COORSTEK MEMBRANE SCI AS
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