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On the Nature of Cemented Carbide Wear in Rock Drilling
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences.
2004 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

WC/Co cemented carbide is a composite material for highly demanding wear applications. The unique combination of hardness (from the WC-phase) and toughness (from the binder Co) gives a material especially suitable for rock drilling. This thesis, investigates the deterioration and wear of these cemented carbide buttons and the correlation to different rock types.

To better understand the nature of the wear of the cemented carbide buttons, the counter surface –the rock- has also been studied. A range of important rock types has been investigated with respect to hardness distribution and scratch response in a micro scale and friction properties when slid against cemented carbides.

The cemented carbide may deteriorate due to a number of mechanisms. The effect of fatigue in the structure was studied in TEM and particle erosion response was used to probe the corresponding mechanical degradation.

Further, homing cross sectioning has been developed and used as a new technique to investigate the presence of weak zones in the surface layer of a drill button. It was found that rock penetration into this layer is a very common mechanism, with profound implications for the nature of the wear.

High resolution scanning electron microscopy has been extensively used to map the deterioration and wear of numerous drill buttons, worn against different rock types in different kinds of drilling applications. Finally, the collected data on the surface damage, the reptile skin formation, the rock intrusion and the properties of the rock are assembled into a new view of the deterioration and wear of cemented carbide in rock drilling.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis , 2004. , p. 74
Series
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 964
Keywords [en]
Materials science, cemented carbide, wear, rock drilling, rock
Keywords [sv]
Materialvetenskap
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:uu:diva-4223ISBN: 91-554-5939-0 (print)OAI: oai:DiVA.org:uu-4223DiVA, id: diva2:164434
Public defence
2004-05-07, Siegbahnsalen, Ångströmlaboratoriet, Polacksbacken, Uppsala, 10:15
Opponent
Supervisors
Available from: 2004-04-15 Created: 2004-04-15Bibliographically approved
List of papers
1. Micro scale hardness distribution of rock types related to rock drill wear
Open this publication in new window or tab >>Micro scale hardness distribution of rock types related to rock drill wear
2003 In: Wear, Vol. 254, no 11, p. 1147-1154Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-91628 (URN)
Available from: 2004-04-15 Created: 2004-04-15Bibliographically approved
2. Micro-scratch evaluation of rock types - a means to comprehend rock drill wear
Open this publication in new window or tab >>Micro-scratch evaluation of rock types - a means to comprehend rock drill wear
2004 In: Tribology International, Vol. 37, p. 203-210Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-91629 (URN)
Available from: 2004-04-15 Created: 2004-04-15Bibliographically approved
3. Friction between a cemented carbide rock drill button and different rock types
Open this publication in new window or tab >>Friction between a cemented carbide rock drill button and different rock types
2002 In: Wear, Vol. 253, p. 1219-1221Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-91630 (URN)
Available from: 2004-04-15 Created: 2004-04-15Bibliographically approved
4. Pressure induced modification of a cemented carbide
Open this publication in new window or tab >>Pressure induced modification of a cemented carbide
2001 In: 15th International Plansee Seminar, Vol. 2, p. 685-697Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-91631 (URN)
Available from: 2004-04-15 Created: 2004-04-15Bibliographically approved
5. Surface damage on cemented carbide rock drill buttons
Open this publication in new window or tab >>Surface damage on cemented carbide rock drill buttons
2001 In: Wear, Vol. 249, p. 324-329Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-91632 (URN)
Available from: 2004-04-15 Created: 2004-04-15Bibliographically approved
6. Homing cross sectioning - a technique to reveal weak zones in worn surfaces
Open this publication in new window or tab >>Homing cross sectioning - a technique to reveal weak zones in worn surfaces
Manuscript (Other academic)
Identifiers
urn:nbn:se:uu:diva-91633 (URN)
Available from: 2004-04-15 Created: 2004-04-15 Last updated: 2010-01-13Bibliographically approved
7. Impact-induced rock penetration in cemented carbide rock drill buttons
Open this publication in new window or tab >>Impact-induced rock penetration in cemented carbide rock drill buttons
Manuscript (Other academic)
Identifiers
urn:nbn:se:uu:diva-91634 (URN)
Available from: 2004-04-15 Created: 2004-04-15 Last updated: 2010-01-13Bibliographically approved
8. A new view of the deterioration and wear of cemented carbide rock drill buttons
Open this publication in new window or tab >>A new view of the deterioration and wear of cemented carbide rock drill buttons
Manuscript (Other academic)
Identifiers
urn:nbn:se:uu:diva-91635 (URN)
Available from: 2004-04-15 Created: 2004-04-15 Last updated: 2010-01-13Bibliographically approved

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