Processing foam-like porous glass structure using a combined process of glass powder expansion in aqueous environment and sintering process için kapak resmi
Processing foam-like porous glass structure using a combined process of glass powder expansion in aqueous environment and sintering process
Başlık:
Processing foam-like porous glass structure using a combined process of glass powder expansion in aqueous environment and sintering process
Yazar:
Zeren, Doğuş, author.
Yazar Ek Girişi:
Fiziksel Tanımlama:
xv, 120 leaves: color illustraltions, charts.+ 1 computer laser optical disc.
Özet:
Soda-lime glass foams were formed by the controlled pore structure of inorganic particle-liquid suspensions at room temperature and then sintered at elevated temperatures between 650oC-800 oC. The slurries were prepared using the glass particles below 38 􀁐m (fine), between 38 and 45 􀁐m (medium) and between 45 and 56 􀁐m (coarse) and with 50, 55, and 60 wt% solid content and 2, 3, and 4 wt% carboxymethyl cellulose (CMC) binder addition. The slurries were foamed using an Al-based foaming agent and a calcium hydroxide alkali activator with an amount of 1 wt%. An increase in CMC content and a decrease in particle size shifted the slurries from a Newtonian to a non-Newtonian behavior and slurry stabilization with the CMC addition. The extensively increased initial bubble pressure in high viscosity slurries resulted in higher linear expansion rate initially followed by a bursting of gas bubbles. The maximum foam linear expansion of the slurries increased with CMC addition until about ~5 Pa s and the expansions stayed almost constant over 400% expansion, while the slurries with the viscosity above 50 Pa s could not be foamed. The most effective factor on the maximum expansion was found the solid content followed by CMC content and the least effective factor was determined the particle size. Partial bonding of glass particles and excessive shrinkage of glass particles due to the melting of foam green bodies were seen at 650 and 800 oC sintering temperatures. Prepared foam glasses showed lower compressive strengths and thermal conductivities than the glass foams reported in the literature. Finally, foaming at room temperature with this technique was found to be more advantageous than conventional glass foam production techniques due to ease of pore formation controlling at room temperature.
Yazar Ek Girişi:
Tek Biçim Eser Adı:
Thesis (Doctoral)--İzmir Institute of Technology: Materials Science and Engineering.

İzmir Institute of Technology: Materials Science and Engineering--Thesis (Doctpral).
Elektronik Erişim:
Access to Electronic Versiyon.
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