Sintering of bimodal alumina powder mixtures with a nanocrystalline component

B. G. Ravi, R. Chaim, A. Gedanken

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Abstract

Packing characteristics and sintering behavior of the bimodal mixtures of nanocrystalline (75 nm) and conventional (1 μm) alumina powders were investigated. Green density of the pure nanocrystalline compact was lower than that of the pure coarse particles. Increase in the packing density was observed at 70% coarse particle composition. The powders shrinkage characteristics were determined by dilatometry. The cold pressed compacts were sintered within the temperature range of 1300 °C to 1600 °C. The green density followed the packing rules giving rise to higher packings in the bimodal compacts. At temperatures below 1400 °C, the relative density kept this pattern. Above 1400 °C, this advantageous densification was lost. The changes in densification of the compacts versus powder composition and sintering temperature were discussed with respect to phase transition and sintering in the compact.

Original languageEnglish
Pages (from-to)853-859
Number of pages7
JournalNanostructured Materials
Volume11
Issue number7
DOIs
StatePublished - Oct 1999

Bibliographical note

Funding Information:
The authors thank the Ministry of Science, Israel, for supporting this research through the infrastructure grant # 5878-2-96.

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