Silicon nitride precursor polymer

Details Silicon nitride precursor polymer Silicon nitride precursor polymer

1990-06-15

1992-07-21

Marquis, Melvyn I.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

528 10, 528 31, 528 39, 524443, 524428, 423344, 423347, 423324, C08K 334

Patent

active

051323540

ABSTRACT:
Preceramic polysilazanes which (1) are composed of silicon, nitrogen, and hydrogen, (2) can be isolated and redissolved in common organic solvents, and (3) are capable of providing a high ceramic yield when pyrolyzed are prepared by reacting a mixture of one molar proportion of a tetrahalosilane, preferably tetrachlorosilane, and at least 4.5 molar proportions of a dihalosilane, preferably dichlorosilane, in an organic solvent. Ceramics obtained from the polysilazanes are nanoporous, amorphous silicon nitride ceramics having high purity.

REFERENCES:
patent: 4397828 (1983-08-01), Seyferth et al.
patent: 4720532 (1988-01-01), Seyferth et al.
patent: 4818611 (1989-04-01), Arai et al.
patent: 4869854 (1989-09-01), Takeda et al.

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