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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 11    No. 4    August 2001

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Pressureless sintering of La-Y-Sialon ceramics and
grain growth in later period of sintering
WANG Ling-sen(王零森), ZHANG Zheng-fu(张正富),
FAN Yi(樊 毅), YIN Bangyue(尹邦跃)

State Key Laboratory for Powder Metallurgy,
Central South University,Changsha 410083, P.R.China

Abstract:The pressureless sintering process of Sialon ceramics added (1.5% La2O3+4.5%Y2O3) as sintering aids was studied. It is found that a β′-Sialon with relative density over 99%is obtained by sintering at 1750℃ for 1h.  Crystal grain growth was observed at room temperature by SEM for the samples sintered at 1800℃ holding for different time. It is proved that grain growth along c-axis of β′-phase is a first priority, since (210) and (001)  lattice plans have different activation energy. On the present conditions, logarithm of grain aspect ratio L ̄/W ̄ of average grain length L ̄ to average width W ̄ is in proportion to sintering time because of proportion of lgL ̄to sintering time and proportion of W ̄ to sintering time.

 

Key words: Sialon; grain growth; pressureless sintering

ISSN 1672-7029
CN 43-1423/U

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