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The foaming mechanism of glass foams prepared from the mixture of Mn3O4, carbon and CRT panel glass.
- Source :
-
Ceramics International . Jan2021, Vol. 47 Issue 2, p2839-2847. 9p. - Publication Year :
- 2021
-
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]
- Subjects :
- *CELLULAR glass
*CARBON foams
*FOAM
*CATHODE ray tubes
*CARBON dioxide
*MOLTEN glass
Subjects
Details
- Language :
- English
- ISSN :
- 02728842
- Volume :
- 47
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Ceramics International
- Publication Type :
- Academic Journal
- Accession number :
- 147345015
- Full Text :
- https://doi.org/10.1016/j.ceramint.2020.09.138