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Influence of Dissolved Oxygen Content on the Properties of Aqueous Milled WC-Co Powders

100%

Chicinas H. F. , Marton L.-E. , Popa C. O.

2023

tom Vol. 68, iss. 3

1205--1210

The research aims to develop a novel and safer milling route to produce Hard Metals. Considering the risks associated with milling fine particles under organic solvents, especially the increased fire and explosion risks, we propose milling under aqueous milling media to diminish the risks associated with fire hazards, while maintaining the oxidation level at a minimum. The samples were sintered in an industrial sintering oven under vacuum at 1380°C subsequent to milling and drying. The characterisation of the materials has been done by X-ray diffraction, scanning electron microscopy, particle size analysis, optical microscopy, and a magnetometer. The obtained results indicate that appropriate properties of the powders after milling and drying as well as the desired biphasic (Co-WC) phases were obtained after sintering, thus proving the feasibility of such a route and diminishing specific fire hazards.

Hardmetals characterization by tribological means

84%

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

2013

tom 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.