Metal-ceramic built-up unit, a built-up framework for transfer of oxide ions, a built-up unit having a capability of sealing

Abstract

A sealing technique is established in which a seal can be easily formed and which is excellent in reliability and a heat cycle property in a high temperature region of 800 DEG C or higher, so as to provide a composite body preferably used for a device for producing pure oxygen, oxygen-rich air, and the like, a membrane reactor represented by that for partial oxidation of a hydrocarbon gas, a solid oxide fuel cell, an oxygen purification device, a heat exchanger, or the like. The present invention makes it possible to increase a possibility of practical use in a wide area which has been delayed in development owing to a bottleneck of improvement in a sealing property. Particularly, its application to the device for producing pure oxygen, oxygen-rich air, or the like, the membrane reactor represented by that for partial oxidation of the hydrocarbon gas, the solid oxide fuel cell, the oxygen purification device, the heat exchanger, or the like can greatly contribute to acceleration of the development.

Description

[0001] This application is a divisional application of the Chinese patent application with application number 01815345.3 submitted on September 7, 2001. technical field [0002] The present invention relates to a ceramic-metal composite, a composite structure for oxide ion transport, and a hermetic composite, and particularly to a diaphragm reactor, an oxygen separation device, and an oxide ion transport application device using them. object. Background technique [0003] As for the sealing technology in the high temperature region exceeding 800°C, examples are given below. [0004] First, production of pure oxygen and production of oxygen-enriched air will be described. This technology brings huge economical effects by supplying cheap oxygen or oxygen-enriched air in fields that consume a lot of oxygen, such as ironmaking, glass, and cement. The principle of producing pure oxygen or oxygen-enriched air using mixed conductive oxides that have both oxide ion conductivity an...

AI Technical Summary

Problems solved by technology

[0025] However, when molten glass is used for the sealing material, the sealing material is melted out from the joint during use, or when the pressures of the two gases separated as in the above-mentioned pure oxygen production are different, the molten glass The problem of intolerance to poor pressure

In addition, glass materials also have the following problems: high joint strength cannot be obtained; during long-term use at high temperatures, sealing material deterioration such as evaporation and crystallization of components occurs, and stable characteristics cannot be obtained; due to thermal expansion differences during low-temperature curing, Sealability cannot be guaranteed after several thermal cycles; chemical reaction occurs with the material to be joined (especially oxide solid electrolyte), deteriorating the material to be joined

[0027] However, there are cases where the firing temperature of the sealing material is close to the firing temperature of the two materials to be joined, or is higher than the firing temperature of one of the materials to be joined due to the combination. Problems where materials are damaged by heat

In addition, preparing and sintering a suitable sealing material is a laborious method, and there is still room for improvement in sealing performance, so it has not been used for practical use.

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