Zobrazeno 1 - 10
of 97
pro vyhledávání: '"Vlastimil, Matějka"'
Publikováno v:
Scientific Reports, Vol 13, Iss 1, Pp 1-10 (2023)
Abstract Keeping recycling and the circular economy in mind, this study explores the reduction in emission of a highly optimized, commercially employed friction material formulation through the addition of metallurgical slags from a basic oxygen furn
Externí odkaz:
https://doaj.org/article/6cf02b4d8ec942938fb8e5f0aedff2cf
Autor:
Vlastimil Matějka, Radim Škuta, Kryštof Foniok, Vlastimil Novák, Daniel Cvejn, Alexandr Martaus, Monika Michalska, Jiří Pavlovský, Petr Praus
Publikováno v:
Journal of Materials Research and Technology, Vol 18, Iss , Pp 3319-3335 (2022)
This work describes the doping of graphitic carbon nitride (g-C3N4) with phosphorus performed by 2-h heat treatment of a mechanical mixture of g-C3N4 precursor (urea, dicyandiamide, and guanidine hydrochloride) with hexachlorocyclotriphosphazene at 5
Externí odkaz:
https://doaj.org/article/9938aa204fb748b1894da366eb8a37e2
Publikováno v:
Nanoscale Research Letters, Vol 16, Iss 1, Pp 1-14 (2021)
Abstract Graphitic carbon nitride (CN) synthetized by the thermal polycondensation of melamine at 550 °C for 4 h was further exfoliated by heating at 500 °C for 3 h. Silver cations were adsorbed on the exfoliated graphitic carbon nitride (CNE) and
Externí odkaz:
https://doaj.org/article/8763cb97f3cc4d43afe3f1659b88ff3b
Autor:
Vlastimil Matějka, Priyadarshini Jayashree, Mara Leonardi, Jozef Vlček, Tomáš Sabovčík, Giovanni Straffelini
Publikováno v:
Lubricants, Vol 10, Iss 9, p 219 (2022)
The aim of our research was to indicate the suitability of metallurgical slags (two blast furnace slags and one steel furnace slag) as the components of Cu-free friction materials. The base mixture consisted of nine components including phenolic resi
Externí odkaz:
https://doaj.org/article/a0b1bbffc06c4396886f8c24cab4e111
Publikováno v:
Lubricants, Vol 10, Iss 2, p 27 (2022)
This study compares the effect of the addition of two types of lubricants on the dry sliding behavior of a simplified Cu-free phenolic resin-based composite material. The lubricants were commercial graphite and exfoliated graphitic carbon nitride (co
Externí odkaz:
https://doaj.org/article/f191503363a442deb594ffd69594698f
Publikováno v:
Metals, Vol 12, Iss 1, p 123 (2022)
In this study, graphitic carbon nitride (g-C3N4, labelled as gCN) was tested in the formulation of copper-free (Cu-free) friction mixtures, which are potentially interesting for brake pad manufacturing. Three formulations of friction composites were
Externí odkaz:
https://doaj.org/article/c389566d0b3d449e946406b9f480143e
Autor:
Jozef Vlček, Michaela Topinková, Miroslava Klárová, Petra Maierová, Hana Ovčačíková, Vlastimil Matějka, Alexandr Martaus, Veronika Blahůšková
Publikováno v:
Minerals, Vol 11, Iss 2, p 197 (2021)
Metakaolin (MK) prepared by the calcination of kaolin at 550 °C and fly ash (FA) from the combustion of black coal in a granulating boiler were used to prepare unfired ceramic bonding systems via the alkali activation process. A long-term stability
Externí odkaz:
https://doaj.org/article/ab46e3093d72467c84c498f99d67afef
Publikováno v:
Journal of Sustainable Metallurgy. 8:511-521
Publikováno v:
Nanomaterials, Vol 10, Iss 9, p 1747 (2020)
Graphitic carbon nitride (GCN) was synthetized by heating melamine and then it was thermally exfoliated for 1–3 h in air. Both bulk and exfoliated GCN nanomaterials were treated in the 10–30% aqueous solutions of H2O2 for us to study their modifi
Externí odkaz:
https://doaj.org/article/1c41452061c54f6aa6287f7c499c6ea3
The Effect of Temperature and Milling Process on Steel Scale Utilized as a Pigment for Ceramic Glaze
Publikováno v:
Materials, Vol 13, Iss 8, p 1814 (2020)
This study is focused on the evaluation of the re-utilizability of scale originated during the steel casting and steel rolling processes as a pigment for glazes. Non-oiled scale with Fe3O4 as the major phase were used as a coloring component of trans
Externí odkaz:
https://doaj.org/article/e8ef5b8f28a342e3b760b5a5bc32622c