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Sintered silicon nitrode recuperator fabricationThe preliminary design and a demonstration of the feasibility of fabricating submodules of an automotive Stirling engine recuperator for waste heat recovery at 370 C are described. Sinterable silicon nitride (Sialon) tubing and plates were fabricated by extrusion and hydrostatic pressing, respectively, suitable for demonstrating a potential method of constructing ceramic recuperator-type heat exchangers. These components were fired in nitrogen atmosphere to 1800 C without significant scale formation so that they can be used in the as-fired condition. A refractory glass composition (Al2O3 x 4.5 CaO.MgO x 11SiO2) was used to join and seal component parts by a brazing technique which formed strong recuperator submodules capable of withstanding repeated thermal cycling to 1370 C. The corrosion resistance of these materials to Na2SO4 + NaCl carbon mixtures was also assessed in atmospheres of air, hydrogen and CO2-N2-H2O mixtures at both 870 C and 1370 C for times to 1000 hours. No significant reaction was observed under any of these test conditions.
Document ID
19800007004
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Gatti, A. (General Electric Co. Philadelphia, PA, United States)
Chiu, W. S. (General Electric Co. Philadelphia, PA, United States)
Mccreight, L. R. (General Electric Co. Philadelphia, PA, United States)
Date Acquired
September 4, 2013
Publication Date
January 1, 1980
Subject Category
Nonmetallic Materials
Report/Patent Number
DOE/NASA/0054-79/1
NASA-CR-159706
Accession Number
80N15263
Funding Number(s)
CONTRACT_GRANT: DEN3-54
PROJECT: RTOP 778-35-03
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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