Open AccessJoining SI3N4 for Advanced Turbomachinery Applications
Author(s) -
S. Jill Glass,
Ronald E. Loehman,
F.M. Hosking,
J.J. Stephens,
Paul T. Vianco,
Michael K. Neilsen,
Charles A. Walker,
John P. Pollinger,
F.M. Mahoney,
Brian G. Quillen
Publication year - 2000
Publication title -
osti oai (u.s. department of energy office of scientific and technical information)
Language(s) - English
Resource type - Reports
DOI - 10.2172/760738
Subject(s) - turbomachinery , ceramic , brazing , materials science , silicon nitride , finite element method , mechanical engineering , silicon , metallurgy , structural engineering , engineering , alloy
The main objective of this project was to develop reliable, low-cost techniques for joining silicon nitride (Si{sub 3}N{sub 4}) to itself and to metals. For Si{sub 3}N{sub 4} to be widely used in advanced turbomachinery applications, joining techniques must be developed that are reliable, cost-effective, and manufacturable. This project addressed those needs by developing and testing two Si{sub 3}N{sub 4} joining systems; oxynitride glass joining materials and high temperature braze alloys. Extensive measurements were also made of the mechanical properties and oxidation resistance of the braze materials. Finite element models were used to predict the magnitudes and positions of the stresses in the ceramic regions of ceramic-to-metal joints sleeve and butt joints, similar to the geometries used for stator assemblies
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