3 documents found, page 1 of 1
Brass smelting dust as a source of ZnO in the production of targets used in mag...
Monteiro, R. C. C.; Kullberg, A. T.; Lopes, A. A. S.; Pinto, J. V.; Nunes, D.; Gonçalves, A.; Fortunato, E.; Castro, F.The feasibility of using a zinc oxide rich waste (ZnO>95%), dust originated in the brass smelting industrial process, as a raw material to produce targets to be used in radiofrequency magnetron sputtering (RFMS) deposition of ZnO thin films was investigated. The ZnO waste was characterized in terms of chemical and mineralogical compositions and particle size distribution. The targets were prepared by uniaxial p...
Use of different inorganic solid wastes to produce glass foams
Barbosa, A. R.; Lopes, A. A. S.; Monteiro, R. C. C.; Castro, FernandoCathode Ray Tube (CRT) waste glasses produced from dismantling TV sets were used to prepare glass foams by a simple and economic processing route, consisting of a direct sintering process of mixtures of CRT waste as glass powder with different foaming agents (coal fly ash and limestone quarrying residues). The influence of firing temperature, amount and type of foaming agent on the apparent density, pore size d...
Crystallization kinetics of a barium-zinc borosilicate glass by a non-isotherma...
Lopes, A. A. S.; Monteiro, R. C. C.; Soares, R. S.; Lima, M. M. R. A.; Fernandes, M. H. V.The crystallization kinetics of a glass with a molar composition 40BaO-20ZnO-30B(2)O(3)-10SiO(2) was investigated. The kinetic parameters, activation energy for crystallization (E-c) and Avrami exponent (n), were evaluated under non-isothermal conditions using the results obtained by differential thermal analysis (DTA) performed at different heating rates. DTA curves exhibited two overlapping exothermic peaks a...