Binder removal from injection moulded zirconia ceramics

Dean-Mo Liu, Wenjea J. Tseng

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Binder removal from a wax-based zirconia ceramic moulding has been investigated in terms of solid content of the mouldings (45-55 vol%), heating rate (0.5-5°C min-1), sample form (powder and block), and sample thickness (0.5-5 mm). Experimental results show that the samples with lower surface-to-volume ratio or more solid content has greater restriction to binder transport which reduces binder removal kinetics to a significant extent. Such a transport restriction can be minimised or eliminated by using the sample in a powdered configuration. The behaviour of binder pyrolysis is considerably modified by the presence of inorganic particles, which may be considered as a result of catalytic reaction. Activation energy of pyrolysis of the binder is evaluated directly based on the existing kinetics models through the use of the resulting weight loss-temperature curve. The activation energy for evaporation obtained is smaller than that for thermal degradation suggesting that for the binder with low molecular weight currently employed, evaporation may be considered as a dominant mechanism for binder removal. This finding is also in well agreement with literature results.

Original languageEnglish
Pages (from-to)529-534
Number of pages6
JournalCeramics International
Volume25
Issue number6
DOIs
StatePublished - 1 Jan 1999

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