抄録
The characterization of the surface of silicon nitrides treated with the organo-silyl chrorides was performed by means of microanalysis, dispersive property into water, infrared spectra, pyrolysis and extrusion test of their blends with paraffine. The followings were recognized: (1) The number of surface group of the surface-treated silicon nitrides was estimated as 2×1014 CM-2 from the carbon contents which agreed with that of the silica gels treated with organo-silyl chlorides. (2) The characteristic absorption due to surface group was not observed in IR-spectra of the surface-treated silicon nitrides except that treated with octadecyltrichlorosilane because of the small number of surface group per unit weight of the substrate. (3) The pyrolysis temperature and products of the surface group agreed with those of silica gels treated with the corresponding organo-silyl chlorides. Therefore, it was ascertained that the silicon nitride was covered by SiO2-layer and thus the surface of silicon nitride was composed of the surface silanols. (4) The extrusion test of the blend with paraffine showed that the amount of paraffine for the blend of the surface-treated silicon nitride was needed to be smaller than that of the untreated silicon nitride in order to obtain a certain flow property.
