Abstract
The microstructure of two-step sintered silicon nitride was studied. An investigation was undertaken concentrating on the effects of microstructure developed after the initial stage sintering on the grain size distribution and aspect ratio in β-grains during the final stage of sintering. Experimental results indicated that the grain size increased, grain size distribution became wider, and more volume of large grains was developed with increase of presintering temperature and time. The aspect ratio could increase or decrease with presintering temperature, depending on the duration of the initial stage sintering.
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