アルミニウム金属の窒化による窒化アルミニウム/アルミニウム複合体の製造

概要

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AlN/Al composites were prepared by the nitridation of Al-MgO (0-7.5 wt%) Powder compacts at 1100-1400℃. The dense composite layer grew outward from the bottom surface of the powder compact at 1250-1400℃. The conversion of Al to AlN and the thickness of the composite increased with increasing content of MgO, reaction temperature and time. The nitridation of the powder compact proceeded in the following four steps: (i) nitridation of the surface of Al particle, (ii) destruction of the surface AlN film and the eruption of molten Al by thermal mismatch between Al and AlN. (iii) dissolution of MgO into erupted Al, (iv) growth of AlN/Al composite by the nitridation of MgO-dissolved Al. The microstructure of the resulting composite from which Al metal was removed by etching shows the channels which molten Al might wick through during nitridation. According to the outward growth and the microstructure of the composite, the growth mechanism of AlN/Al composite may be the same as that of so-called Lanxide^<TM> process.
社団法人日本セラミックス協会の論文
1993-08-01