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Use of Ni3Al in Joining and Connecting to ITM Materials

IP.com Disclosure Number: IPCOM000019423D
Publication Date: 2003-Sep-12
Document File: 1 page(s) / 21K

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Abstract

Oxygen can be recovered from air at high temperatures by passing hot, oxygen-containing gas, preferably air, over non-porous, mixed conducting ceramic membranes. These membranes, known in the art generically as ion transport membranes (ITMs), utilize an oxygen partial pressure differential across the membrane to cause oxygen ions to migrate through the membrane.

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Use of Ni3Al in Joining and Connecting to ITM Materials

Oxygen can be recovered from air at high temperatures by passing hot, oxygen-containing gas, preferably air, over non-porous, mixed conducting ceramic membranes. These membranes, known in the art generically as ion transport membranes (ITMs), utilize an oxygen partial pressure differential across the membrane to cause oxygen ions to migrate through the membrane.

Membranes can be fabricated as tubes or flat plates that are arranged in modules for efficient contact with the hot compressed air. A comprehensive review of ion transport membranes is given by J. D. Wright and R. J. Copeland in Report No. TDA-GRI-90/0303 prepared for the Gas Research Institute, September 1990.

Adaptation of ITM technology to processes such as oxygen, syngas, or hydrogen production will require the joining of ITM materials to various high temperature service alloys. While many of the properties of these alloys are suitable for ITM process applications, the materials' chemical and thermal compatibility with ITM applications may be inadequate.

Because of their corrosion and oxidation resistance, apparent compatibility with ITM materials, high temperature mechanical properties, and relatively low cost, the Ni3Al family of materials is well suited to interfacing involving ITM materials. Most importantly, Ni3Al has a thermal expansion coefficient close to that of some of the preferred ITM materials. Through slight modifications to the alloy, such as...