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DOLGU MADDESİ OLARAK KULLANILAN FARKLI UÇUCU KÜLLERİN SERT POLİÜRETAN KÖPÜK MALZEMELERİN MEKANİK ÖZELLİKLERİ İLE ISIL VE YANMA DAVRANIŞLARI ÜZERİNE ETKİLERİ

THE EFFECTS OF DIFFERENT FLY ASH FILLERS ON THE MECHANICAL PROPERTIES, THERMAL AND FIRE BEHAVIORS OF RIGID POLYURETHANE FOAMS

Journal Name:

  • Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

Publication Year:

  • 2013

Key Words:

Keywords (Original Language):

Author NameUniversity of AuthorFaculty of Author
Abstract (2. Language): 
Fly ash which is a by-product of coal-fired power stations has been used as filler in different polymeric materials for different purposes. Since the chemical composition and the size of fly ash may vary depending on the coal type and combustion, properties of fly ash should be examined before the incorporation of fly ash into polymeric materials. In this study, two fly ashes which have different chemical compositions are used as filler in rigid polyurethane foams. The fly ashes were added in 5 %, 10 %, 15 % and 20 % in the total mass. The morphology of polyurethane foam cells was observed by using scanning electron microscopy and the effects of two different fly ashes on the thermal conductivity, the compressive strength, thermal stability and flammability of rigid polyurethane foams were investigated. Experimental results indicated that fly ash addition into rigid polyurethane foam has no negative effects on thermal conductivity of the materials; however it caused decreasing in the compression strength within the acceptable limits. In addition, it was determined that the foam materials filled with the fly ash containing high amount of SiO2 shows better fire resistance and thermal stability.
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Abstract (Original Language): 
Kömür kullanılan güç santrallerinin bir yan ürünü olan uçucu kül, farklı polimer malzemelerde değişik amaçlar için dolgu maddesi olarak kullanılmaktadır. Uçucu külün kimyasal bileşimi ve parçacık boyutu, kömür tipine ve yanmaya bağlı olarak değişebildiğinden dolayı polimer malzemelerde kullanılmadan önce bu özelliklerinin incelenmesi gereklidir. Bu çalışmada, farklı kimyasal bileşime sahip iki uçucu kül, sert poliüretan köpük malzemede dolgu maddesi olarak kullanılmıştır. Uçucu küller toplam kütleye % 5, % 10, % 15 ve % 20 oranlarında eklenmiştir. Sert poliüretan köpüğün elektron mikroskobu ile hücre yapısı incelenmiş ve iki farklı uçucu külün köpüğün ısı iletim katsayısına, basma dayanımına, ısıl kararlılığına ve alev alabilirliğine etkileri incelenmiştir. Deneysel sonuçlar, uçucu küllerin sert poliüretan köpük malzemeye ilavesinin ısı iletim katsayısı üzerinde olumsuz etkilere sebep olmadığını, bununla birlikte, basma dayanımında kabul edilebilir sınırlar içerisinde düşmelere neden olduğunu ortaya koymuştur. Ayrıca, yüksek SiO2 içeren uçucu kül ilaveli köpük malzemelerin ısıl bozunma ve yanmaya daha dirençli olduğu belirlenmiştir.
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