Method of fabricating silicon nitride bodies

Details Method of fabricating silicon nitride bodies Method of fabricating silicon nitride bodies

1974-03-18

1978-09-12

White, Robert F.

Plastic and nonmetallic article shaping or treating: processes

Vacuum treatment of work

106 732, 106 735, 264 85, 264332, C04B 3558

Patent

active

041138309

ABSTRACT:
In a method for fabricating highly dense, polycrystalline silicon nitride bodies, a mixture of silicon nitride powder and an oxide, hydride or nitride of an element of the lanthanide series in powder form is hot pressed at a temperature ranging from 1600.degree. to 1750.degree. C for a period of 30 to 60 minutes. The method is particularly useful for fabricating structural components, such as stators, blades, airfoils and buckets in high performance gas turbine engines.

REFERENCES:
patent: 3830652 (1974-08-01), Gazza
Gazza, "Hot pressed Si.sub.3 N.sub.4," J. Am. Cer. Soc. 56 [12] p. 662.
Mazdiyasni et al., "Synthesis, Characterization, and Consolidation of Si.sub.3 N.sub.4 Obtained from Ammonalysis of SiCl.sub.4," J. Am. Cer. Soc., 56 [12] pp. 628-633.
Aboaf, "Some Properties of Vapor Deposited Silicon Nitride Films Obtained by the Reaction of SiBr.sub.4 and NH.sub.3 ", J. Electrochem. Soc., pp. 1736-1740, Dec. 1969.
Hackh's Chemical Dictionary, p. 771.

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