EFFECT PARAMETERS FOR SINTERING BEHAVIOR AND MICROSTRUCTURE DEVELOPMENT OF SiAlON CERAMICS

Öz

SiAlON ceramics are produced by suitable compositional design  using Si₃N₄, AlN, Al₂O₃, SiO₂ starting powders and sintering aids (Sm₂O₃, CaO, Y₂O₃, Yb₂O₃ etc.) to the desired effect. SiAlON ceramics are widely and preferably used in high temperature applications due to their superior mechanical properties. Microstructure is the most important determining factor in the mechanical properties of SiAlON ceramics. The microstructural evolution and densification behavior of the SiAlON ceramics are controlled by specifications of the starting powders, starting composition, type and the wetting behavior of the sintering aid additives, quantity and composition of the transient liquid phase, α→b phase transformation, heating and cooling rate, presintering conditions, sintering atmosphere, time and peak temperature. Since the material properties are generally controlled by microstructure which in turn controlled by production processes and especially the sintering stage, in this review article, the effect of sintering parameters and variables on the microstructural evolution is explained.

Anahtar Kelimeler

• SiAlON,Sintering,Microstructure,Densification

SiAlON SERAMİKLERİNİN SİNTERLEME DAVRANIŞI VE MİKROYAPI GELİŞİMİNİ ETKİLEYEN PARAMETRELER

Öz

SiAlON seramikleri, başlangıç tozları Si₃N₄, AlN, Al₂O₃, SiO₂ ve sinterlemeye yardımcı oksitler (Sm₂O₃, CaO, Y₂O₃, Yb₂O₃ vs.) kullanılarak uygun kompozisyon tasarımı sonrası üretilirler. SiAlON seramikleri, üstün mekanik özelliklerinden dolayı özellikle yüksek sıcaklık dayanımının istendiği uygulama alanlarında yaygın olarak kullanılmaktadırlar. SiAlON seramiklerin mekanik özelliklerinde mikroyapı önemli bir rol oynar.  SiAlON seramiklerinde mikroyapı gelişimi ve yoğunlaşma davranışı, başlangıç kompozisyonu, geçici sıvı fazın miktarı, kompozisyonu, α→b faz dönüşümü, başlangıç tozlarının spesifikasyonları, sinterleme ilaveleri türü ve ıslatma davranışı, ısıtma ve soğutma hızı, ön sinterleme koşulları, atmosfer, zaman ve sıcaklık tarafından kontrol edilmektedir. Malzeme özellikleri genellikle mikroyapıyla kontrol edilmekte ve mikroyapı da üretim prosesleri ve özellikle sinterleme aşaması tarafından kontrol edildiği için bu derleme makalede sinterleme parametreleri ve değişkenlerinin mikroyapı gelişimine etkisi açıklanmıştır.

Anahtar Kelimeler

• SiAlON,Sinterleme,Mikroyapı,Yoğunlaşma

Kaynakça

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