Abstract
A high purity Al powder was directly reacted with isotopically enriched 15N2 gas at 1,200°C in a vacuum furnace to synthesize Al15N. In the initial reaction process, a small amount of AlF3, was mixed with the Al powder to suppress excess temperature rise due to the heat of formation of the nitride. Then, the Al15N thus formed was used as the diluent for the second run, and the same procedure was repeated. A total of 100g of Al15N powder with 15N isotopic content 99.6 at% was formed with average gas efficiency of 75.6%. Then the Al15N powder was pressureless-sintered at 1,830°C in an argon atmosphere by adding a small amount of Y2O3 as the sintering agent. An Al15N ceramic plate with dimensions 50mm × 50mm × 1.6 mm and relative density 97.3% was obtained with the 15N isotopic content 99.2 at%. Some physical properties and stability in air of an Al15N ceramic plate were studied.
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