Effects of residual gas on densification and microstructure development of Al2O3 and ZrO2-8 mol pct Y2O3 ceramics sintered in air

Effects of residual gas on densification and microstructure development of Al2O3 and ZrO2-8 mol pct Y2O3 ceramics sintered in air

Measurements of gas emission during fracture of Al2O3 and ZrO2-8 mol pct Y2O3 sintered in air were carried out under ultrahigh vacuum using a mass spectrometer in order to examine the effect of entrapped gas on densification and microstructure development of the materials. Analysis of the spectromet...

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Veröffentlicht in:Nihon Kinzoku Gakkai shi (1952) 2000-10, Vol.64 (10), p.851-856
Hauptverfasser: Matsumoto, Mineaki, Nakajima, Tatsuo, Kuramoto, Sigeru, Kanno, Motohiro, Kitaoka, Satoshi, Matsubara, Hideaki
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container_issue 10
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container_title Nihon Kinzoku Gakkai shi (1952)
container_volume 64
creator Matsumoto, Mineaki
Nakajima, Tatsuo
Kuramoto, Sigeru
Kanno, Motohiro
Kitaoka, Satoshi
Matsubara, Hideaki
description Measurements of gas emission during fracture of Al2O3 and ZrO2-8 mol pct Y2O3 sintered in air were carried out under ultrahigh vacuum using a mass spectrometer in order to examine the effect of entrapped gas on densification and microstructure development of the materials. Analysis of the spectrometer revealed that nitrogen introduced from the sintering atmosphere was mainly emitted at the moment of fracture for both materials. During prolonged sintering, the density of Al2O3 tended to decrease and the amount of emitted gas increased. In contrast, the density of ZrO2-8 mol pct Y2O3 did not decrease and the emitted gas tended to decrease in the course of sintering. This sintering behavior was concluded to result from the difference in nitrogen diffusivity between the materials. (Author)
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Analysis of the spectrometer revealed that nitrogen introduced from the sintering atmosphere was mainly emitted at the moment of fracture for both materials. During prolonged sintering, the density of Al2O3 tended to decrease and the amount of emitted gas increased. In contrast, the density of ZrO2-8 mol pct Y2O3 did not decrease and the emitted gas tended to decrease in the course of sintering. This sintering behavior was concluded to result from the difference in nitrogen diffusivity between the materials. 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title Effects of residual gas on densification and microstructure development of Al2O3 and ZrO2-8 mol pct Y2O3 ceramics sintered in air
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