EFFECT PARAMETERS FOR SINTERING BEHAVIOR AND MICROSTRUCTURE DEVELOPMENT OF SiAlON CERAMICS

Yıl 2017, Sayı: 039, 31 - 42, 15.12.2017

Nurcan Çalış Açıkbaş

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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