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Hardmetals characterization by tribological means

Ścieszka S. F., Grzegorzek W., Żołnierz M.

Journal of Achievements in Materials and Manufacturing Engineering

2013

Vol. 59, nr 2

86--98

Purpose: The objectives of the paper are as follows. Firstly the presentation of new and reliable integrated testing method, in which conjoin action involving fracture and abrasion of hardmetals is carefully monitored and analysed, and secondly the evaluation of the empirical relationship between mass loss as a result of edge chipping during the initial transition stage of abrasive wear and fracture toughness in the form of formula. Design/methodology/approach: The tests were performed in a purpose-built testing machine. The apparatus consists of the disc rotating in the cylindrical chamber under normal force. The specimen bars, made from the hardmetals are attached to the upper side of the disc. The results from this testing show that by using one apparatus and one shape of the test specimen it is possible to obtain a reliable rating of hardmetals. Findings: The integrated testing method required a theoretical or empirical model which describes the relationship between fracture toughness, other mechanical properties and the test’s fracture indicator. The best correlation received was for empirical model based on study on abrasive wear by lateral cracking. Practical implications: The proposed method offers advantages when used in hardmetals development programmes to rank a large number of materials in terms of abrasion and fracture resistance. Originality/value: The innovative method enables the evaluation of abrasion and fracture resistance, one shape of specimen, and one testing procedure.

Implantation of boron ions into hard metals

Mrochek I., Gunzel R., Matz W., Moller W., Anishchik V.

Nukleonika

1999

Vol. 44, nr 2

217-224

The present study has shown that hardness and wear behaviour of (15%Co)-cemented WC alloys can be improved by boron ion implantation. The B+ implantation was carried out at different temperatures. Three ion fluences have been chosen: 5x1016cm-2, 1x1017cm-2and 5x1017cm-2 , each at an energy of 40 keV. The XRD analysis has shown that after implantation one observes a broadening of the XRD tungsten carbide peaks towards smaller angels. An optimisation between the boron fluences and temperature has still to be performed.

Przedstawione badania wykazały, że twardość i własności zużyciowe stopu WC z 15% zawartością Co jako czynnika spajającego mogą być poprawione przez implantację jonami boru. Implantacja jonami B+ była przeprowadzona w różnych temperaturach. Stosowano wiązki jonowe o energii 40 keV i dawkach 5x1016jonów/cm2, 1x1017 jonów/cm2 i 5x1017jonów/cm2. Dyfrakcyjna analiza rentgenowska (XRD) wykazała, że po implantacji obserwowano poszerzanie się dyfrakcyjnych wierzchołków rentgenowskich węglików wolframu w stronę mniejszych kątów. Optymalizacja pomiędzy wielkością strumienia jonów boru i temperaturą jest w dalszym ciągu dokonywana.