Preparation of a hybrid preceramic precursor for Al-Si-C-N nanocomposites via a molecular building block approach
The reaction between (HAlNPri)m (Pri = CH(CH3)2) and [MeSi(H)NH]n (Me = CH3) led to hydrogen elimination to form a hybrid precursor. Thermogravimetry revealed that the ceramic yield of the hybrid precursor was much higher than those of (HAlNPri)m and [MeSi(H)NH]n, which was ascribed to the hydrogen elimination condensation between the AlH groups in (HAlNPri)m and the NH groups in [MeSi(H)NH]n during precursor synthesis and pyrolysis. The pyrolyzed product under Ar was a mixture of β-SiC, β-Si3N4 and 2H wurtzite-type compound, and the particle sizes were in the range of 20-30 nm.