Sintering characteristics of nanocrystalline tio2

H. Hahn Hahn, J. Logas Logas, R. S. Averback

Research output: Contribution to journalArticlepeer-review

Abstract

The microstructural development of compacted nanocrystalline TiO2 powder was studied as a function of sintering temperature up to 1000°C. Grain growth was monitored using x-ray diffraction and scanning electron microscopy. The specific surface area and total porosity were determined quantitatively using nitrogen adsorption BET. The density was measured by gravimetry. The green body density of compacted n-TiO2 with average grain size of 14 nm is as high as 75% of theoretical bulk density. Low temperature surface diffusion leads to the disappearance of small pores, while densification commences at 600°C and reaches near theoretical values at 900°C. Grain growth also begins at 600°C, accelerating rapidly by 1000°C. Hot isostatic pressing enhances densification while suppressing grain growth.

Original languageEnglish (US)
Pages (from-to)609-614
Number of pages6
JournalJournal of Materials Research
Volume5
Issue number3
DOIs
StatePublished - Jan 1 1990

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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