Abstract
The surface-treatment of silicon nitride with pentanol, octanol and cetanol was investigated through X-ray diffractometry, scanning electron microscopy, X-ray photoelectron spectroscopy, infrared spectroscopy, pyrolysis and the flow property of the silicon nitride mixed with paraffine. The followings were found: (1) The surface of silicon nitride was covered by oxide film. (2) The crystallographic structure of the substrate, the shape or aggromeration of the grain and the surface area were not affected by the surface-treatment. (3) The surface groups were not detectable through infrared spectroscopy except the surface group including the long carbon chain. (4) The olefine similar to the alcohol used for surface-treatment was observed in the pyrolysis products of the surface-treated silicon nitrides in the temperature range of 350-500°C. This trend is the same as the pyrolysis of the surface-treated silica gels with alcohols. Thus the surface-treatment of silicon nitride was recognized to be performed by the reaction of the surface hydroxide of the oxide layers over the silicon nitride with the alcohol. (5) The amount of paraffine added to surfacetreated silicon nitride was found to be 10 wt% smaller than that to the non-treated one in order to show a certain flow property of the silicon nitride mixed with paraffine.
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