Abstract
The processing and reaction mechanism of metallic aluminum (Al) powder as an active filler that controls polycarbosilane (PCS) precursor pyrolysis are investigated. Since Al can react with N2 to produce aluminum nitride (AlN), the linear shrinkage upon pyrolysis decreases and the ceramic yield of PCS increases. The linear shrinkage is zero when the volume ratio between Al and PCS, νAl/PCS, is about 56%. Aluminum also enhances the three-point bending strength of the ceramics with a flexural strength of 212 MPa when νAl/PCS is 60%. The relationship among pyrolysis temperature, T p, linear shrinkage and flexural strength of the derived ceramics has been investigated. The results showed that, for the Al-containing PCS-derived ceramics, a linear expansion occurred as the flexural strength was enhanced when T p increased from 400 to 1000°C. The reaction mechanism of Al-controlled PCS pyrolysis was investigated by thermogravimetry-differential thermal analysis (TG-DTA), X-ray diffraction (XRD), and elemental line-scanning electron microscopy (ELSEM). The results showed that the SiC powder took on the role of a catalyst, which decreased the nitridation temperature of aluminum and increased the conversion yield from Al to AlN.
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