1. The foaming mechanism of glass foams prepared from the mixture of Mn3O4, carbon and CRT panel glass.
- Author
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Petersen, Rasmus R., König, Jakob, Iversen, Niels, Østergaard, Martin B., and Yue, Yuanzheng
- Subjects
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CELLULAR glass , *CARBON foams , *FOAM , *CATHODE ray tubes , *CARBON dioxide , *MOLTEN glass - Abstract
Cathode ray tube (CRT) panel glass is processed into glass foams by using carbon and Mn 3 O 4 as foaming agents. We investigate the foaming ability and foaming mechanism of the mixture by varying the composition and the temperature. Carbon load of 5 wt% inhibits the sintering of the glass powder, while 2 wt% carbon promotes the coalescence of pores during foaming. Carbon load of ≤0.4 wt% is suitable for achieving low density foams (0.15–0.23 g cm-3) with closed pores (75–100%). Foaming is initiated by the reaction between carbon and Mn 3 O 4 and this is the main source of melt expansion. Reduction of cations in the glass melt, including Mn3+ dissolved from Mn 3 O 4 , makes an important contribution to the melt foaming at >800 °C. The main gaseous product is CO 2 (67–95 vol%). CO appears above 800 °C and the concentration increases with temperature. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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