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

Year 2019, , 568 - 575, 31.08.2019

Zeynep Taşlıçukur Öztürk , Cem Şahin Nilgün Kuşkonmaz

https://doi.org/10.18185/erzifbed.442681

Cited By: 1

Abstract

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.

Keywords

Silisyum Nitrür, silisyum karbür, soğuk izostatik pres, sinterleme

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

Abstract

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.

Keywords

Silicon nitride, silicon carbide, cold isostatic press, sintering

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