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Dissolution of bulk specimens of silicon nitrideAn accurate chemical characterization of silicon nitride has become important in connection with current efforts to incorporate components of this material into advanced heat engines. However, there are problems concerning a chemical analysis of bulk silicon nitride. Current analytical methods require the pulverization of bulk specimens. A pulverization procedure making use of grinding media, on the other hand, will introduce contaminants. A description is given of a dissolution procedure which overcomes these difficulties. It has been found that up to at least 0.6 g solid pieces of various samples of hot pressed and reaction bonded silicon nitride can be decomposed in a mixture of 3 mL hydrofluoric acid and 1 mL nitric acid overnight at 150 C in a Parr bomb. High-purity silicon nitride is completely soluble in nitric acid after treatment in the bomb. Following decomposition, silicon and hydrofluoric acid are volatilized and insoluble fluorides are converted to a soluble form.
Document ID
19810057620
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Davis, W. F.
(NASA Lewis Research Center Cleveland, OH, United States)
Merkle, E. J.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 11, 2013
Publication Date
June 1, 1981
Publication Information
Publication: Analytical Chemistry
Subject Category
Nonmetallic Materials
Accession Number
81A42024
Distribution Limits
Public
Copyright
Other

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