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Colloidal characterization of silicon nitride and silicon carbideThe colloidal behavior of aqueous ceramic slips strongly affects the forming and sintering behavior and the ultimate mechanical strength of the final ceramic product. The colloidal behavior of these materials, which is dominated by electrical interactions between the particles, is complex due to the strong interaction of the solids with the processing fluids. A surface titration methodology, modified to account for this interaction, was developed and used to provide fundamental insights into the interfacial chemistry of these systems. Various powder pretreatment strategies were explored to differentiate between true surface chemistry and artifacts due to exposure history. The colloidal behavior of both silicon nitride and carbide is dominated by silanol groups on the powder surfaces. However, the colloid chemistry of silicon nitride is apparently influenced by an additional amine group. With the proper powder treatments, silicon nitride and carbide powder can be made to appear colloidally equivalent. The impact of these results on processing control will be discussed.
Document ID
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Feke, Donald L.
(Case Western Reserve Univ. Cleveland, OH, United States)
Date Acquired
September 5, 2013
Publication Date
May 1, 1986
Publication Information
Publication: NASA, Lewis Research Center, Structural Ceramics
Subject Category
Nonmetallic Materials
Accession Number
Funding Number(s)
Distribution Limits
Work of the US Gov. Public Use Permitted.

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