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Al‐System Non‐Oxide Spherical Powder Synthesis by Liquefied Petroleum Gas Firing
Author(s) -
Takao Yasumasa,
Sando Mutsuo
Publication year - 2005
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2005.00062.x
Subject(s) - liquefied petroleum gas , materials science , grinding , diffusion , chemical engineering , raw material , range (aeronautics) , oxide , metallurgy , composite material , chemistry , organic chemistry , thermodynamics , physics , engineering
Synthesis of non‐oxide materials includes solid‐phase grinding, liquid building‐up, plasma, and CVD. The raw powder of the sintered body is commercialized by solid‐state synthesis; however, it is non‐spherical in shape and its size is below the submicron range. We considered the changes in free energy of Al, O 2 , N 2 , NH 3 , liquefied petroleum gas (LPG) and focused on the reaction accelerator effect of LPG for Al nitridation or Al 2 O 3 reduction. As a result, we found that, conceptually, some Al nitridation syntheses via LPG firing could occur. The LPG firing method can provide a gas diffusion nitridation mechanism, and can therefore produce Al‐oxynitride (AlON) directly (Al powder did not convert to AlON completely), and AlN spherical powders with diameters above the submicron range.