Method for manufacturing a hafnium-containing silazane polymer and a method for manufacturing a ceramic from said polymer
AssigneeShin-Etsu Chemical Co., Ltd.
InventorsYoshihumi Takeda, Akira Hayashida
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Abstract
A hafnium-containing silazane polymer is obtained through a polymerization reaction of which the reactants are (A) a halide of an organic silicon compound; (B) a hafnium compound having a the formula: HfX.sub.4 [I] wherein X is chlorine or bromine, and (C) a disilazane having the formula: ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 may be the same or different and are hydrogen, methyl ethyl, phenyl or vinyl.
Claims5
In a method for forming a shaped ceramic article wherein a silazane polymer is fused, shaped, infusibilized, and baked, the improvement which comprises said polymer being a hafnium-containing silazane polymer obtained by reacting, under conditions to effect polymerization in a water-free atmosphere and at a temperature between about 25.degree. C. and 350.degree. C., a mixture of
- (A) a halide of an organic silicon compound selected from the group consisting of:
- ##STR6## wherein R.sub.4 and R.sub.5 may be the same or different and are hydrogen, chlorine, bromine, methyl, ethyl, phenyl or vinyl and X is chlorine or bromine;
- a compound having the formula:
- ##STR7## wherein R.sub.6 is hydrogen, chlorine, bromine, methyl, ethyl, phenyl or vinyl, R.sub.7 is hydrogen or methyl, and X is chlorine or bromine;
- and mixtures thereof;
- (B) a hafnium compound having the formula:
- HfX.sub.4 [I]
- wherein X is chlorine or bromine;
- and
- (C) a disilazane having the formula ##STR8## wherein R.sub.1, R.sub.2 and R.sub.3 may be the same or different and are hydrogen, methyl ethyl, phenyl or vinyl.
Dependencies are inferred from the claim text.