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The development of microstructure during heating has been investigated for molded Si{sub 3}N{sub 4} bodies fabricated with commercial {alpha}-Si{sub 3}N{sub 4} powder and a preceramic polysilazane binder. After the N-methyl polysilazane binder is pyrolyzed at 800{degree}C under N{sub 2}, the bodies have a uniform microstructure composed of an intimate mixture of Si{sub 3}N{sub 4} particles and polysilazane-derived amorphous silicon nitride. After the particles undergo high-temperature treatment at 1,725{degree}C in an N{sub 2} overpressure of {approx} 700 kPa, significant grain growth occurs. SEM and microhardness data suggest local densification in the body and high reactivity for the polysilazane-derived silicon nitride.
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Schwartz et al. (1988) studied this question.
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