Nişastayla Konsolidasyon Yöntemiyle Gözenekli Silika Esaslı Seramiklerin Üretimi

Year 2016, Volume: 16 Issue: 3, 734 - 746, 31.12.2016

Ayşe Kalemtaş

Abstract

Bu çalışmada, nişastayla konsolidasyon yöntemi kullanılarak hazırlanan gözenekli kristobalit esaslı seramiklerin göreceli olarak düşük sıcaklıkta üretilmiştir. Başlangıç tozu olarak Si3N4 tozu, sinterleme ilavesi olarak ise boraksdekahidrat ile ticari bir kaolen kullanılmıştır. Gözenek oluşturucu olarak ise mısır nişastası kullanılmıştır. Sinterleme koşullarına bağlı olarak (1000-1200C’de 1 saat sinterleme) oldukça düşük yığınsal yoğunluk (0,83-1,08 g/cm3) ve yüksek gözenekliliğe sahip (%53-73) seramiklerin üretildiği belirlenmiştir. Sinterleme hava atmosferinde gerçekleştirilmiş ve uygulanan ısıl işlem esnasında Si3N4 tozunun oksidasyona uğraması sonucunda yapıda ana faz olarak kristobalit fazının oluştuğu XRD analizleriyle belirlenmiştir. Mikroyapı incelemelerinde nişastayla konsolidasyon yöntemiyle üretilen seramiklerin yüksek oranda gözeneğe sahip olduğu ve yapıda ortalama 80-100 μm ile birkaç μm ile sınırlı iki farklı boyut dağılımına sahip gözeneğin oluştuğu belirlenmiştir.

Keywords

Nişastayla konsolidasyon;, Gözenekli seramik;, Silisyum nitrür;, Boraksdekahidrat;, Kristobalit.

References

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