Processing foam-like porous glass structure using a combined process of glass powder expansion in aqueous environment and sintering process
by
 
Zeren, Doğuş, author.

Title
Processing foam-like porous glass structure using a combined process of glass powder expansion in aqueous environment and sintering process

Author
Zeren, Doğuş, author.

Personal Author
Zeren, Doğuş, author.

Physical Description
xv, 120 leaves: color illustraltions, charts.+ 1 computer laser optical disc.

Abstract
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.

Subject Term
Porous materials.
 
Glass.
 
Glass-ceramics.
 
Ceramic materials
 
Insulating materials.

Added Author
Güden, Mustafa,

Added Corporate Author
İzmir Institute of Technology. Materials Science and Engineering.

Added Uniform Title
Thesis (Doctoral)--İzmir Institute of Technology: Materials Science and Engineering.
 
İzmir Institute of Technology: Materials Science and Engineering--Thesis (Doctpral).

Electronic Access
Access to Electronic Versiyon.


LibraryMaterial TypeItem BarcodeShelf NumberStatus
IYTE LibraryThesisT001927TA418.9.P6 Z58 2019Tez Koleksiyonu
IYTE LibrarySupplementary CD-ROMROM3088TA418.9.P6 Z58 2019 EK.1Tez Koleksiyonu