AlNの焼結および熱拡散率に及ぼす複合超微粉 (AlN/Al) ならびにEu<SUB>2</SUB>O<SUB>3</SUB>の添加の影響

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  • Effect of Ultrafine AlN/Al and Eu<SUB>2</SUB>O<SUB>3</SUB> Powder Addition on Sintering Characteristics and Thermal Diffusivity of AlN
  • AlNの焼結および熱拡散率に及ぼす複合超微粉(AlN/Al)ならびにEu2O3の添加の影響
  • AlN ノ ショウケツ オヨビ ネツ カクサンリツ ニ オヨボス フクゴウ チ

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The composite ultrafine powder AlN/Al with an average size of 300 nm was synthesized by arc-plasma method. This powder was added up to 15 mass% into the two kinds of commercial AlN powders prepared by the direct nitridation of Al and the carbon reduction nitriding of Al2O3. The mixed powders with the sintering aid Eu2O3 were sintered in the temperature range from 1923 to 2123 K in a flow of N2 gas and their density and thermal diffusivity were measured at 300 K. The composite ultrafine powder AlN/Al promotes the sintering of the two kinds of AlN powders. A sintered compact of AlN with the theoretical density was obtained at 1973 K by adjusting the amounts of Eu2O3 and composite ultrafine powder AlN/Al. The thermal diffusivity of the sintered sample increases with increasing the amount of the composite ultrafine powder AlN/Al if the sintering temperature is lower than 2073 K and the amount of Eu2O3 is less than 3 mass%. Otherwise it decreases with adding the composite ultrafine powder. Compared with the case used Y2O3 as the sintering aid, the effect for the composite ultrafine powder to promote the sintering of AlN is larger, but the effect for it to raise the thermal diffusivity of AlN is smaller when the sintering aid Eu2O3 is used.

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