Pressurelessly Sintered from Powder Synthesized by a Novel Carbothermal Nitridation Method
was pressurelessly sintered from powders synthesized by a two‐step carbothermal nitridation method, using core‐shell structured AlON 2 Al 3/ O
mixture derived from the pyrolysis of an C 2 Al 3/ureaformaldehyde‐resin nanocomposite precursor as the starting material. It was found that the amorphous carbon layer on the O 2 Al 3
particle surface could strongly retard the coalescence and growth of O 2 Al 3 particles during the carbothermal nitridation process. As a result, the formation temperature and particle size
of the O powder were significantly reduced. The AlON powder synthesized showed a bimodal particle size distribution at 0.2 and 0.7 μm and was well dispersed; its maximum particle size was below 0.9 μm.
Under the aid of proper sintering additive, transparent AlON ceramics with an average in‐line transmittance above 80% at visible to infrared range were obtained through pressureless sintering.
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Document Type: Research Article
Publication date: September 1, 2012