Kolemanit katkısının kordiyerit cam-seramiklerin kristalizasyon davranışı üzerindeki etkilerinin araştırılması

Abstract

Kordiyerit esaslı cam-seramikler, yüksek termal direnç özellikleri ile birlikte düşük dielektrik sabiti ve düşük termal genleşme katsayısına sahip mühendislik malzemeleridir. Düşük maliyetlerde üretilebilmesi ve iyi elektriksel özelliklere sahip olması dolayısıyla, kordiyerit cam-seramikler elektronik endüstrisinde alümina yerine altlık malzeme olarak kullanılabilmekte ve ayrıca çok katmanlı devre kartlarının, katalitik konvertörlerin ve ısı yalıtım malzemelerinin üretiminde de alternatif bir malzeme olarak değerlendirilebilmektedir. Kordiyerit esaslı camlar dar bir sinterleme sıcaklık aralığına ve yüksek viskoziteye sahip olduklarından, çekirdeklenme katalisti olmadan 1000 °C’nin altında kristalleştirilebilmeleri zordur. Düşük sıcaklıkta ve yüksek yoğunlukta cam-seramiklerin üretimi için viskoziteyi azaltıcı fluxlaştırıcı özellikteki ve çekirdeklenmeyi sağlayıcı katkıların (ZrO2, TiO2, CeO2, Y2O3, CaO, ZnO, P2O5, B2O3 gibi) ve miktarlarının seçimi oldukça önem arz etmektedir. Bu çalışmada, kordiyerit sitokiyometrisine uygun bileşimde hazırlanan karışımların camlaştırıldıktan sonraki kristalleşebilme kabiliyeti üzerinde kolemanit katkısının etkileri araştırılmıştır. Magnezya, kaolen ve kuvars hammaddelerine ağırlıkça % 0, 1, 2 ve 3 oranlarında kolemanit ilavesi ile oluşturulan karışımların endüstriyel koşullarda 1500 °C’de ergitilerek sonrasında ani soğutma ile cam yapı elde edilmiştir. Kırma ve öğütme işlemlerinden geçirilerek elde edilen cam tozların termal analiz tekniği ile camsı geçiş (Tg) ve kristalizasyon (Tc) sıcaklıkları belirlenmiştir. 1000 °C’de yapılan sinterleme sonrasında cam-seramik faz yapısındaki değişimler incelenmiştir.

Keywords

• Cam seramik
• kordiyerit
• kolemanit
• müllit kristalizasyon

Investigation of the effects of colemanite addition on the crystallization behaviour of cordierite glass-ceramics

Abstract

 Cordierite based glass-ceramics are engineering materials with high thermal resistance properties, as well as low dielectric constant and low thermal expansion coefficient. Cordierite glass-ceramics can be produced at low costs and have good electrical properties. They can be used as a substrate instead of alumina in the electronics sector, as well as an alternative material in the production of multilayer circuit boards, catalytic converters, and thermal insulation materials. Since cordierite based glasses have a narrow sintering temperature range and high viscosity, it is difficult for them to be crystallized below 1000 °C without a nucleation catalyst. For the production of low temperature and high-density glass-ceramics, it is crucial to select the additives (ZrO2, TiO2, CeO2, Y2O3, CaO, ZnO, P2O5, B2O3, etc.) and their amounts that have the fluxing properties that reduce viscosity and provide nucleation. In this study, the effects of colemanite addition on the crystallization ability after vitrification of mixtures prepared in a composition suitable for cordierite stoichiometry were investigated. Colemanite at 0, 1, 2 and 3 wt. % ratios were added to the mixtures of magnesia, kaolin, and quartz raw materials were melted at 1500 °C in industrial conditions, and then glass structure was obtained by sudden cooling. Glass transition (Tg) and crystallization (Tc) temperatures of glass powders obtained by crushing and grinding were determined by thermal analysis technique. The changes in the phase structure of glass-ceramic after sintering at 1000 °C were examined.

Keywords

• Glass-seramik
• cordierite
• mullite
• crystallisation

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