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Tribological testing of drill bit inserts
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
2011 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This thesis work sought to find a tribological testing method suitable for cementedcarbide drill bit inserts used when drilling rock. A review of the literature publishedon the matter showed that there are quite a few test methods developed for wearstudies with cemented carbides, but most of them were not designed for the rockdrilling industry. Published studies performed with the found methods and articleswith analyzed field tests have been studied. It is generally agreed upon that the stepsof wear is that the binder disappears first, followed by removal of carbide grains. Themechanisms of binder phase and carbide grain removal is somewhat debated, butalmost every study observes fracture of the carbide grains. The wear test created inthis thesis was shown to give wear linear with time, but not with load. The newmethod was shown to be capable of distinguishing between different cementedcarbides worn in three body abrasion against different rocks. Analysis of the wornsamples shows that there are similarities with bit inserts worn in field testing. Many ofthe observations made during the analysis are also similar to observations inliterature.

Place, publisher, year, edition, pages
UPTEC Q, ISSN 1401-5773 ; 11005
Keyword [en]
tribological testing, drill bit inserts, cemented carbide wear
National Category
Composite Science and Engineering
URN: urn:nbn:se:uu:diva-160584OAI: diva2:451521
Educational program
Master Programme in Materials Engineering
Available from: 2011-10-26 Created: 2011-10-26 Last updated: 2011-10-26Bibliographically approved

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