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Preparation of silicon carbide‐silicon nitride fibers by the pyrolysis of polycarbosilazane precursors: A review
Author(s) -
Penn B. G.,
Daniels J. G.,
Ledbetter F. E.,
Clemons J. M.
Publication year - 1986
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760261705
Subject(s) - materials science , silicon carbide , silane , pyrolysis , composite material , carbide , ceramic , electrical resistivity and conductivity , nitride , silicon , relative humidity , silicon nitride , chemical engineering , polymer chemistry , layer (electronics) , metallurgy , physics , electrical engineering , engineering , thermodynamics
Abstract The development of silicon carbide‐silicon nitride (SiC‐Si 3 N 4 ) fibers by the pyrolysis of polycarbosilazane precursors that was carried out in this laboratory is reviewed. Precursor resin, which was prepared by heating tris(N‐methylamino)methylsilane or tris(N‐methylamino)phenyl‐silane to about 520°C, was drawn into fibers from the melt and then made unmeltable by humidity conditioning at 100°C and 95 percent relative humidity. The humidity‐treated precursor fibers were pyrolyzed to ceramic fibers with good mechanical properties and electrical resistivity. For example, SiCSi 3 N 4 fibers derived from tris(N‐methyl‐amino)‐methylsilane had a tensile rupture modulus of 29 × 10 6 psi and electrical resistivity of 6.9 × 10 8 Ω‐cm, which is 10 12 times greater than a value obtained for graphite fibers.