Basınçsız ve Spark Plazma Sinterlenmiş Si3N4 Kompozitlerin Özelliklerine SiC’ün Etkisi

Öz

SiC partikülleri matriks içine farklı ağırlık oranlarında katılarak Si₃N₄-SiC kompozit hazırlanmıştır. Numuneler iki farklı yöntem ile sinterlenmiştir. Numunelere basınçsıs sinterleme ve spark plazma sinterleme yöntemleri uygulanmıştır. Birinci yöntemde, kompozitleri preslemede soğuk izostatik metodu kullanılmıştır. Numuneler 1850 ⁰C’de azot atmosferi altında 1 saat basınçsız olarak sinterlenmiştir. İkinci yöntemde, numuneler azot atmosferi altında 1650 ⁰C’de 5 dakika spark plazma ile sinterlenmiştir. AlN and Y₂O₃ sinterlemeye yardımcı olması için katılmıştır. SiC partiküllerinin Si₃N₄ matrisine eklenmesi, sinterlenmiş numunelerin yoğunluk ve mikroyapı özelliklerinin kontrol edilmesinde kritik rol oynar. Bileşim ve mikroyapının, sinterlenmiş numunelerin özelliklerine etkisi analiz edilmiştir.

Anahtar Kelimeler

• Silisyum Nitrür,silisyum karbür,soğuk izostatik pres,sinterleme

Effect of SiC on the Properties of Pressureless and Spark Plasma Sintered Si3N4 Composites

Öz

Si₃N₄-SiC composites were prepared by adding SiC particles to the matrix in different weight ratios.The samples were sintered with two different methods. The samples were produced by pressureless sintering and spark plasma sintering method. In the first method, cold isostatic pressing method was used to press the composites. The samples were pressureless sintered at 1850 ⁰C for 1 hour under the nitrogen atmosphere. In the second method, the samples were spark plasma sintered at 1650 ⁰C under nitrogen atmosphere under 40 MPa for 5 minutes. AlN and Y₂O₃ were also added to Si₃N₄-SiC composite mixture to aid sintering. Addition of SiC particles to the Si₃N₄ matrix play critical role in controlling of densificication and microstructure properties of the sintered samples. The effect of composition and microstructure on properties of sintered samples was analyzed.

Anahtar Kelimeler

• Silicon nitride,silicon carbide,cold isostatic press,sintering

Kaynakça

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