Bandstructure based activated sintering mechanisms in transition metal based hardmetals and iono-covalent ceramics

T. J. Davies, A. A. Ogwu

Research output: Contribution to conferencePaperpeer-review

Abstract

An electronic interaction model is proposed as underpinning the kinetic processes involved in the sintering and densification processes in hardmetals and ceramics. Usually these are described by sintering equations. Our observation is that the thermo-kinetic factors associated with sintering and densification in hardmetal-binder systems and in iono-covalent ceramics with metal oxide additives have a common feature, namely an underpinning electronic driving force. The mechanism for sintering and densification arises from the presence of bonding and anti-bonding energy levels in both hardmetals and ceramics. Our proposal is that the filling of the anti-bonding energy levels through electron transfer/sharing mechanisms leads to destabilisation, liquid phase formation and rapid diffusion that assists the sintering process.

Original languageEnglish
Pages1-13
Number of pages13
Publication statusPublished - 1999
Externally publishedYes
EventUlusal Toz Metalurjisi Konferansi: Second National Powder Metallurgy Conference - Ankara, Turkey
Duration: Sep 15 1999Sep 17 1999

Conference

ConferenceUlusal Toz Metalurjisi Konferansi: Second National Powder Metallurgy Conference
Country/TerritoryTurkey
CityAnkara
Period9/15/999/17/99

All Science Journal Classification (ASJC) codes

  • Metals and Alloys

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