Examining Si3N4 Base Materials with Various Rare Earth Additions
ARMY LAB COMMAND WATERTOWN MA MATERIALTECHNOLOGY LAB
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Silicon nitride base compositions were prepared by using various rare earth oxide additives and hot pressing the powders to full density. Compositions were primarily explored in Si3N4-SiO2-RE2Si2O7 compatibility regions although other Si3N4-RE2O3 reactions were also investigated. Hot pressing densification data and high temperature behavior of the various silicon nitride rare earth compositional systems are examined.