Hidrotermal Olarak Sentezlenen Xonotlit ve Tobermorit Ara Fazlarının Isı Yalıtkanı Olarak Wollastonit Oluşumu Üzerindeki Etkileri

Öz

Hidrotermal yöntemle farklı Ca/Si oranları, su/katı (w/s) oranı, reaksiyon sıcaklığı ve sürelerinde sentezlenen tobermorit ve xonotlit kalsiyum silikat hidrat ara fazlarının 800 oC’de kalsinasyonu ile oluşturulan wollastonit fazı üzerine etkileri detaylı şekilde araştırılmıştır. TGA-DTA sonuçları, 200 oC’de sentezlenen malzemelerin daha düşük kütle kaybı ve β-wollastonit oluşumunu temsil eden keskin egzotermik pikler ile daha verimli nihai faza dönüşümü sağlayacağını ortaya koymuştur. FTIR analizleri, 200 oC’de xonotlit benzeri düzenli kristal yapılar, 150 oC’de ise tobermorit benzeri amorf fazların oluştuğunu göstermiştir. Uzun reaksiyon süreleri, amorf C–S–H birikimini artırarak ara fazların kristal kalitesini olumsuz etkilemiştir. Artan w/s oranı iyon taşınımını ve silikat çözünürlüğünü artırarak xonotlit oluşumunu desteklemiştir. Sıcaklık, Ca/Si ve w/s oranlarının kontrollü seçiminin, kristal öncül faz oluşumunda, ardından wollastonite dönüşümünde kritik rol oynadığı görülmüştür. 900 oC’de α-wollastonit faz oluşumu söz konusu olmakla birlikte, wollastonit yapının 1100 oC’ye kadar termal kararlılığını koruduğu belirlenmiştir.

Anahtar Kelimeler

• Kalsiyum silikatlar
• Ara fazlar
• Termal davranış
• Yalıtım malzemeleri
• kimyasal yapı

Effects of Hydrothermally Synthesized Xonotlite and Tobermorite Intermediate Phases on Wollastonite Formation for Thermal Insulator

Öz

The effects of calcium silicate hydrate intermediate phases tobermorite and xonotlite synthesized hydrothermally under varying Ca/Si ratios, water/solid (w/s) ratios, reaction temperatures, and durations on the wollastonite formation through calcination at 800  oC were investigated in detail. TGA-DTA results revealed that materials synthesized at 200  oC exhibited lower weight losses and sharper exothermic peaks indicative of β-wollastonite formation, suggesting a more efficient transformation into the final phase. FTIR analyses demonstrated that well-ordered xonotlite-like crystalline structures were formed at 200 oC, whereas tobermorite-like phases were observed at 150 oC. Prolonged reaction times were found to increase the accumulation of amorphous C–S–H, thereby adversely affecting crystallinity of the intermediate phases. Higher w/s ratios enhanced ionic transport and silicate solubility, thereby promoting the formation of xonotlite. The controlled selection of temperature, Ca/Si ratio, and w/s ratio was determined to be a key factor in the formation of crystalline precursor phases and their subsequent transformation into wollastonite. Although α-wollastonite formation was detected at 900  oC, the wollastonite structure was found to retain its thermal stability up to 1100  oC.

Anahtar Kelimeler

• Calcium silicates
• intermediate phases
• thermal behavior
• insulation materials
• chemical structure

Etik Beyan

The authors of this article declare that the materials and methods used in this study do not require ethical committee permission and/or legal-special permission.

Teşekkür

This work was partially supported by the Scientific and Technological Research Council of Turkey (TUBITAK) with a project code of 124Z394, TUBITAK 2211/C National PhD Scholarship Program in the Priority Fields in Science and Technology, and The Council of Higher Education (YÖK) 100/2000 PhD Scholarship.

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