Hardening of fusible polysilazanes and SiC/Si.sub.3 N.sub.4 cera

Details Hardening of fusible polysilazanes and SiC/Si.sub.3 N.sub.4 cera Hardening of fusible polysilazanes and SiC/Si.sub.3 N.sub.4 cera

1991-06-11

1992-06-23

Group, Karl

Compositions: ceramic

Ceramic compositions

Carbide or oxycarbide containing

501 88, 501 97, 528 28, 528 32, 525474, 525475, C04B 3556, C04B 3558

Patent

active

051242834

ABSTRACT:
Essentially infusible/insoluble crosslinked polysilazanes, well adapted for pyrolysis and conversion into silicon carbide and/or silicon nitride ceramic materials, are produced by intimately contacting a fusible and organic solvent soluble polysilazane starting material with an effective crosslinking amount of gaseous triflic acid, CF.sub.3 SO.sub.3 H, and in which starting polysilazane the organic radicals directly bonded to silicon atoms are saturated and/or aromatic hydrocarbon radicals and such starting polysilazane being devoid of hydrogen atoms directly bonded to a silicon atom.

REFERENCES:
patent: 3853567 (1974-12-01), Verbeek
patent: 4675424 (1987-06-01), King, III et al.
patent: 4689382 (1987-08-01), Lebrun et al.
patent: 4693914 (1987-09-01), Foley
patent: 4861844 (1989-08-01), Lebrun et al.
patent: 4866149 (1989-09-01), Lebrun et al.

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