Synthesis of Pure AlN Powder by the Floating Nitridation Technique

Al‐System Non‐Oxide Spherical Powder Synthesis by Liquefied Petroleum Gas Firing

“…In this study, we describe the synthesis of AlON of using commercial atomized Al powder, because it significantly improves the powder performance of AlON spinel and AlN for their use as sintered body (AlON) and ceramic filler (AlN) 2,6 . The LPG firing method can provide AlON directly (Al powder did not convert to AlON completely), and AlN is prepared by annealing the AlON powder for 1 h at 1400°C in N 2 , which is a rapid and low‐temperature transformation compared with the previous syntheses 1–6 (X‐ray powder diffractions, Fig. 2).…”

“…LPG firing can provide a gas diffusion mechanism, without a gas‐phase reaction mechanism. If the nitridation process involves a “gas‐phase reaction mechanism,” NH 3 mixing after Al heating is favored, which in turn accelerates the reaction because it provides enough time to generate the Al vapor evaporated during heating and to react with NH 3 1,4,5 . However, if the “gas diffusion mechanism” is used, NH 3 mixing before Al heating is favored, because it provides enough time to diffuse NH 3 into the Al particles during the heating process 2,3,6,12 .…”

“…S ynthesis of non‐oxide materials includes solid‐phase grinding, liquid building‐up, plasma, and CVD 1–6 . 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.…”

Influence of processing parameters on synthesis of nano-sized AlN powders

“…Commercial AlN powders are mostly synthesized from the direct nitridation of aluminum, the carbothermal reduction-nitridation (abbreviated as CRN) of alumina or aluminum hydrate [5,6]. It is well known that the CRN method is more advantageous for the preparation of AlN powder with high purity and excellent sinterability.…”

Pyrolytic Organic-to-Inorganic Conversion of Precursors into AlN-A Review

“…AlN powders have generally been prepared by carbothermal reduction of an alumina-carbon mixture, [21][22][23][24][25] polymeric precursors containing an aluminum-oxygen network and a carbon source 26,27 and intercalation compounds [28][29][30] under a nitrogen atmosphere, and by direct and floating nitridation. [31][32][33] In addition, AlN films have been prepared by a chemical vapor deposition CVD process.…”