Journal of Industrial and Engineering Chemistry, Vol.10, No.5, 717-721, September, 2004
Phase Evolution of an Al-B-N Nanocomposite Prepared from a Preceramic Polymer Mixture
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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/ AlB2 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, XRS, and both27Al and 11B solid state NMR spectroscopies.
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