Pirinç Kabuğu Külü Esaslı SiC Parçacıkların Geopolimer Kompozitlerde Takviye Elemanı Olarak Kullanımı

Year 2023, Volume: 26 Issue: 4, 1485 - 1493, 01.12.2023

Cengiz Bagcı , Kubilay Karacif , Bülent Alkan , Halil Arık

https://doi.org/10.2339/politeknik.1130886

Abstract

Bu çalışmada silika içeren doğal pirinç kabuğu atıklarından karbotermal indirgeme yöntemi ile silisyum karbür (SiC) parçacıklar sentezlenmiş ve sentez SiC parçacıklar ile geopolimer (GP) matris takviye edilerek GP kompozitler üretilip mikroyapısal ve mekanik özellikleri karakterize edilmiştir. Pirinç kabuğu 700 °C’de 2 saat süreyle kalsine edilmiş ve pirinç kabuğu külü elde edilmiştir. Kül ile karbon karası C/SiO2 molar oranı 4 olacak şekilde homojenize edilmiştir. Karbotermal indirgeme işlemleri atmosfer kontrollü tüp fırında gerçekleştirilmiştir. Sonrasında, sentez SiC parçacıklar kullanılarak GP kompozitler üretilmiştir. Potasyum silikat çözeltisi ve metakaolinin mekanik karıştırıcıda karıştırılması ile elde edilen bulamaca sentez SiC parçacıklar ağırlıkça %5-15 oranında ilave edilerek karışım homojenize edilmiştir. Mekanik testler için ASTM C78/C78M-18 standardına göre eğme, ASTM C1424-10 standardına göre basma numuneleri hazırlanmış ve testleri gerçekleştirilmiştir. Sonuç olarak artan takviye miktarına bağlı eğme dayanımı artarken Weibull dağılımı geniş bir güvenirlik aralığı sergilemekte, basma dayanımı ise tersi durum gösterirken daha dar bir güvenirlik aralığı ortaya koymaktadır. Her iki durum değerlendirildiğinde %5-10 sentez SiC takviyesi çalışma penceresi olarak görülmektedir.

Keywords

Pirinç kabuğu, SiC, Geopolimer

Supporting Institution

Hitit Üniversitesi

Project Number

MUH19001.19.008.

Thanks

Bu çalışma Hitit Üniversitesi Bilimsel Araştırma Projeleri Birimi tarafından desteklenmiştir. Proje No: MUH19001.19.008.

The Use of Rice Husk Ash-Based SiC Particles as Reinforcement in Geopolymer Composites

Abstract

In this study, silicon carbide (SiC) particles were synthesized from natural rice husk wastes containing silica by carbothermal reduction method, and GP composites were produced by reinforcing the synthesis SiC particles with geopolymer (GP) matrix and their microstructural and mechanical properties were characterized. Rice husk was calcined at 700 °C for 2 hours and rice husk ash was obtained. It was homogenized for 10 minutes with a molar ratio of carbon black at C/SiO2 of 4. Carbothermal reduction processes were carried out in an atmosphere-controlled tube furnace. After that GP composites were produced using synthesis SiC particles. Potassium silicate solution and metakaolin were mixed in a mechanical mixer. Synthesis SiC were added to the slurry prepared in this way at a rate of 5-15% by weight, and the mixture was homogenized. For mechanical tests, bending specimens according to ASTM C78/C78M-18 standard and compression specimens according to ASTM C1424-10 standard prepared and three-point bending and compression tests were performed. As a result, as the bending strength increases due to the increasing amount of reinforcement, the Weibull distribution exhibits a wide confidence interval, while the compressive strength shows a narrower confidence interval, while the opposite situation is observed. When both situations are assessed, 5-10% synthesis SiC supplementation is seen as the working window.

Keywords

Rice husk, SiC, Geopolymer

Project Number

MUH19001.19.008.

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