resumo
Panel (P) and funnel (F) glasses from Cathode Ray Tube (CRT) have been used to obtain glass foams by a simple and economic processing route, consisting of direct heating the glass powders at relatively low temperatures (650-750 degrees C) using different foaming agents (FA) such as egg shells, calcite, dolomite. Mixtures in different proportions of P and F glass powders were tested and the effects of composition and heat treatment temperature on the foaming behaviour were evaluated. Glass foams featuring apparent density and compressive strength values of 0.29 g/cm(3) and 2.34 MPa, respectively, could be produced from a P/F ratio = 1 with added 3 wt% of egg shells upon heat treating at 700 degrees C for 15 min. The P/F ratio was found to strongly influence the foaming behaviour and, consequently, the physical properties of the final foam glass. The relative performance of other foaming agents under a given set of experimental conditions revealed to be dependent on the type of glass (composition and thermal properties). (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
palavras-chave
CATHODE-RAY TUBES
categoria
Materials Science
autores
Fernandes, HR; Ferreira, DD; Andreola, F; Lancellotti, I; Barbieri, L; Ferreira, JMF
nossos autores
Hugo Alexandre Gonçalves da Rocha Fernandes
Investigador Júnior
José Maria da Fonte Ferreira
Professor(a) Jubilado(a)Grupos
G3 - Materiais Eletroquímicos, Interfaces e Revestimentos
G5 - Materiais Biomiméticos, Biológicos e Vivos
agradecimentos
Hugo R. Fernandes is grateful for the financial support of CICECO (PEst-C/CTM/LA0011/2013) and for the Post doc grant (SFRH/BPD/86275/2012) from the FCT, Portugal.