Production and characterization of porous ceramics for high temperature applications için kapak resmi
Production and characterization of porous ceramics for high temperature applications
Başlık:
Production and characterization of porous ceramics for high temperature applications
Yazar:
Semerci, Tuğçe, author.
Yazar Ek Girişi:
Fiziksel Tanımlama:
xviii, 147 leaves: charts;+ 1 computer laser optical disc.
Özet:
This thesis focuses on the production and characterization of different porous polymer derived ceramic (PDC) components (foams, additively manufactured (AM) honeycombs, and aerogels) and demonstrates their potential for high temperature applications, including gas permeability (up to ~700 o C), molten metal filtration, and heat exchanger. The foams were produced via the replica technique and different pore sizes, ranging from 300 μm to 2 mm, silicon oxycarbide (SiOC) ceramic foams were able to be formed. The average total porosity of the foams was 96 vol% with a specific surface area (SSA) of ~80 m2 /g. AM-made honeycomb-like cellular structures with different cell sizes (578 μm, 1040 μm) were obtained via fused filament fabrication. Finally, SiOC aerogels were synthesized using siloxane resin, then dried at ambient pressure and room temperature. The produced SiOC aerogels showed a total porosity of around 80 vol% and an SSA reaching 250 m2 /g. Regarding the high temperature applications of porous PDC components, initially, the gas permeability of SiOC foams was tested, and the results showed stability up to 700 °C in the air without any loss of functionality, offering reusability even in aggressive environments. In the subsequent studies, filtration of molten aluminum alloy was tested using various porous components. PDC foams demonstrated better performance in comparison to the AM-made cellular structures and commercial SiC foams. Finally, heat exchange analysis was performed to evaluate the heat transfer of SiOC foams, and an increase in pressure drop was found to be directly proportional to the rate of increase in air velocity.
Tek Biçim Eser Adı:
Thesis (Doctoral)--İzmir Institute of Technology:Material Science and Engineering.

İzmir Institute of Technology: Material Science and Engineering --Thesis (Doctoral).
Elektronik Erişim:
Access to Electronic Versiyon.
Ayırtma: Copies: