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Evaluation of molar volumes in cemented carbide systems
2003 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

From experimental and theoretical values, a database that describes how the volume changes with composition and temperature has been developed for the C- Co-W-(Ti,Nb,Ta) systems. Special interest has been taken in the TiC, NbC and TaC carbides. For the liquid, bcc, fcc, and hcp phases both molar volume data and thermal expansion data has been determined. For the M6C, M12C, laves and Co3W phases only molar volume data has been determined due to scarce availability of expanion data. From the present database it is possible to predict the volume fractions of phases for new alloys. The thermal expansion data will also make it possible to make calculations on surface tensions and predict how the volume of a phase changes with temperature. The first chapter gives a brief introduction to cemented carbides and how the thermodynamic properties are calculated before describing the development of the database. In the fourth chapter some practical applications are presented, such as design of a new alloy, surface tensions and thermal expansion of a cemented carbide. The calculations on densities show good agreement between measured and calculated values.

Place, publisher, year, edition, pages
Keyword [en]
Technology, Cemented carbides, C-Co-W-(Ti, Nb, Ta), Molar volume, thermal, expansion, TiC, NbC, TaC
Keyword [sv]
URN: urn:nbn:se:ltu:diva-42668ISRN: LTU-EX--03/207--SELocal ID: 0a4ff38d-2651-4ee3-981d-af90c63da254OAI: diva2:1015892
Subject / course
Student thesis, at least 30 credits
Educational program
Engineering Physics, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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