Synthesis and Sintering of AIN using Enriched Nitrogen
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A high purity Al powder was directly reacted with isotopically enriched <SUP>15</SUP>N<SUB>2</SUB> gas at 1, 200°C in a vacuum furnace to synthesize Al<SUP>15</SUP>N. In the initial reaction process, a small amount of AlF<SUB>3</SUB> was mixed with the Al powder to suppress excess temperature rise due to the heat of formation of the nitride. Then, the Al<SUP>15</SUP>N thus formed was used as the diluent for the second run, and the same procedure was repeated. A total of 100g of Al<SUP>15</SUP>N powder with <SUP>15</SUP>N isotopic content 99.6 at% was formed with average gas efficiency of 75.6%. Then the Al<SUP>15</SUP>N powder was pressureless-sintered at 1, 830°C in an argon atmosphere by adding a small amount of Y<SUB>2</SUB>O<SUB>3</SUB> as the sintering agent. An Al<SUP>15</SUP>N ceramic plate with dimensions 50mm×50mm×1.6mm and relative density 97.3% was obtained with the <SUP>15</SUP>N isotopic content 99.2 at%. Some physical properties and stability in air of an Al<SUP>15</SUP>N ceramic plate were studied.
- Journal of Nuclear Science and Technology
Journal of Nuclear Science and Technology 33(7), p.597-603, 1996-07-25
Atomic Energy Society of Japan