Effect of preforms on the synthesis of micro β-SiC from phenol resin and silicon

概要

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The aim of present study is to investigate the effect of preforms on the synthesis of micro β-SiC. For this purpose, preforms were prepared from commercially available phenol resin and silicon powders by pyrolysing at 650℃ and 750℃ in vacuum. Then, preforms were hot isostatically pressed (HIPed) at 1400℃ for 10 min in an argon atmosphere of 50 MPa to synthesize micro β-SiC. X-ray diffraction analyses showed that the formation of β-SiC was enhanced in the specimens prepared by HIPing the preforms pyrolyzed at 750℃, which might be due the more carbonization and the development of porous structure in the range 600-800℃. Scanning electron microscopy observations revealed the formation of micro-crystals (up to 8 μm in size) with facets in the HIPed specimens. In addition, the degree of crystallites in the specimen obtained from the preforms pyrolyzed at 750℃ was higher than the preforms pyrolyzed at 650℃. The energy dispersive spectroscopy showed that crystals were of SiC because the atomic ratio of silicon and carbon atoms in the crystals was almost 1:1. The density of the specimens obtained by HIPing the preforms pyrolyzed at 750℃ was (3.11 g/cm^3) more than the specimens obtained by HIPing preforms pyrolyzed at 650℃ (2.95 g/cm^3). The HIPing process, in addition to densification, led to the formation and growth of β-SiC.
社団法人日本セラミックス協会の論文
2008-07-01