The Observation of the Reaction Sintering Process of the AlN-Al System, by High Temperature X-ray Diffraction

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  • 高温X線回折によるAlN-Al系の窒化反応焼結過程の観察
  • コウオン Xセン カイセツ ニ ヨル AlN-Alケイ ノ チッカ ハンノウ ショウケツ カテイ ノ カンサツ

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The sintering process of the AIN-Al system in N2 gas was observed employing high tem perature X-ray diffraction, and the mechanism of sintering was investigated.<br>Nitriding reaction of Al began at 580°-600°C. The temperature of the powder compact of AlN-Al rose rapidly by nitriding reaction of Al, due to the exothermic nature of nitriding reaction of Al (ΔH298=-76.4kcal/mole). When the temperature of the sample exceeded the melting point of Al (660°C) because of the said exothermic reaction, a few Al particles not having reacted with nitrogen became viscous and aggregated with other Al particles, and for this reason the sintered product became heterogeneous. When a sample was heated to the temperature around or above the melting point of Al before nitriding, Al particles because of the same reason as above flew out to the surface of the sample.<br>In order to apply these results to production, the effects of the forms and Al contents of the crucible shaped samples on sintering were tested.<br>Based upon the above experiments and discussion the sintering condition of AlN-Al was determined.

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