Polysilazane composition which can crosslink in the presence of

Details Polysilazane composition which can crosslink in the presence of Polysilazane composition which can crosslink in the presence of

1986-03-28

1987-08-25

Marquis, Melvyn I.

Coating processes

Heat decomposition of applied coating or base material

Coating decomposed to form carbide or coating carbonized

428446, 428698, 528 15, 528 21, 528 38, 501 88, 501 92, 423344, 423345, 524404, 524408, 524413, 524437, 524588, 524858, 524869, B32B 1702

Patent

active

046892524

ABSTRACT:
A crosslinkable composition comprising at least one polysilazane containing at least 2, preferably at least 3, .tbd.SiH groups per molecule and at least 2 SiR.sub.2 groups per molecule, R.sub.2 being an unsaturated hydrocarbon radical and a catalytically effective quantity of a metal element or of a metal compound to catalyze the hydrosilylation reaction SiH/SiR.sub.2.
The compositions according to the invention can crosslink under the effect of heat and can be used for coating or impregnating substrates with ceramic material after pyrolysis. The mechanical properties of the crosslinked compositions are assessed by evaluating the relative rigidity RR measured by the fiber torsion pendulum method (FIG. 1).

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Chemical Abstracts, vol. 83, No. 12, Sep. 22, 1975, p. 16, Ref. No. 98177z, Columbus, Ohio, U.S.; and SU-A-472,952 (Lomonosov, M. V., Institute of Fine Chemical Technology, Moscow) 05-06-1975.
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