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Thermal Conditioning of ITM Green Ware

IP.com Disclosure Number: IPCOM000019427D
Publication Date: 2003-Sep-12
Document File: 1 page(s) / 81K

Publishing Venue

The IP.com Prior Art Database

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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Thermal Conditioning of ITM Green Ware

         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. High-purity oxygen permeate and nitrogen-enriched
non-permeate products are withdrawn from the modules. 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.

         Unsintered ITM materials (green ware) must be heated to a temperature that is high enough to remove the organic binders and plasticizers from the green body prior to sintering. This process is commonly referred to as bisqueing. In the current practice, the green ceramic is heated in a circulating atmosphere oven. This method of conditioning can yield inconsistent results, since the temperature gradients produced by the furnace may cause the green ware to heat unevenly and deform. The deformed material may crack during the sintering process, or the final sintered body may be deformed.

         To improve the organic removal step of ceramic production, the supported green ware can...