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Phase Evolution of an Al-B-N Nanocomposite Prepared from a Preceramic Polymer Mixture
Jeon, Jong-Kyu,Gervais, Christel,Babonneau, Florence,Kim, Dong-pyo 한국공업화학회 2004 Journal of Industrial and Engineering Chemistry Vol.10 No.5
The phase evolution of an Al-B-N ternary system was studied using mixture of nanosized Al metal powder and polyborazine, as a source of boron and nitrogen, which was pyrolyzed at 1200℃ in an Ar atmosphere. The precursor system initially formed an Al/AlN mixture when annealed at 700℃, and then it converted to AlN/BN/ A1B₂ nanocomposite phase at 900℃. Interestingly, we observed that, at 1200℃, the AlB₂ formed was reduced partly to Al metal embedded in the nanocomposite phase. The systems were investigated using XRD, XPS, and both ^(27)Al and ^(11)B solid state NMR spectroscopies.