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

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.