Development of New Ceramics for Novel Applications

The major objectives of this contract were to establish a high pressure high temperature facility for the study of high performance ceramics and glasses and to begin sintering studies of nitride materials. A high temperature high pressure apparatus was developed and tested to pressures of 30 kilobar...

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Bibliographic Details
Main Authors: Mohr, R K, Varshneya, Deepak
Format: Report
Language:English
Subjects:
ADDITIVES
CERAMIC MATERIALS
Ceramics, Refractories and Glass
FURNACES
HIGH PRESSURE
MATERIALS
NITRIDES
NITROGEN
SILICON NITRIDE(SI3N4)
SINTERING
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Summary:The major objectives of this contract were to establish a high pressure high temperature facility for the study of high performance ceramics and glasses and to begin sintering studies of nitride materials. A high temperature high pressure apparatus was developed and tested to pressures of 30 kilobars and 2150 C. This facility was used to sinter to 99% of theoretical density silicon nitride powders containing a few % of oxygen impurities but no additives. In addition a glass was melted which contained 20 atomic percent nitrogen in the starting materials. Details of the furnace and properties of the sintered materials are reported. Keywords: High pressure sintering, Nitrides, Si3N4, Ceramic materials.