Authors:
Alexander Medina Peschiutta (1,2), Marvin Just (1,2), Ralph Useldinger (2), Jörg Baller (1)
1- Department of Physics and Materials Science, University of Luxembourg, 162A Avenue de la Faiencerie, L-1511 Luxembourg, Grand Duchy of Luxembourg
2- CERATIZIT Luxembourg S.à r.l., 101 Route de Holzem, L-8232, Grand Duchy of Luxembourg
Abstract:
We present a comparative study on determining the critical binder volume concentration (CBVC) of a hard metal paste using the following techniques: theoretical calculation, density method, oil titration, binder titration, and Reddy’s model. The theoretical calculations involve density measurements to discern the carbide powder-free volume. The titration methods consist of a stepwise increase of the organic content while the mixer torque is recorded. In contrast, Reddy’s model requires the preparation of several feedstocks at varying solid loadings, which are tested in a capillary rheometer to obtain the CBVC. The paste consists mainly of nano-sized tungsten carbide-cobalt (powder phase) and a macromolecular multiphase system (organic phase). The accuracy and expenditure of experimental work of the different methods are discussed.
DOI:
https://doi.org/10.59499/EP235764669
