Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.13087/2023
Title: The effect of in-situ formed layered hBN on the machinability and mechanical properties of SPS sintered SiC
Authors: Yılmaz, Zuhal
Savacı, Umut
Turan, Servet
Ay, Nuran
Keywords: Composite
Electron microscopy
hBN
Machinability
SiC
Issue Date: 2021
Publisher: Elsevier Ltd
Abstract: In this study, the relationship between machinability, mechanical properties and microstructure of hBN-SiC composites was investigated. Manufacturing of the composites started with the calcination of raw materials at 850 °C for 16 h under a nitrogen atmosphere prior to mixing with 5 wt% of Al2O3:Y2O3 sintering additives and then powder mixtures were spark plasma sintered at 1850 °C for 17 min by applying 50 MPa pressure. Characterizations of the samples were carried out with FTIR, XRD, SEM and TEM methods. The physical and mechanical properties of the samples were determined with density measurement, Vickers hardness, Young's modulus, three-point bending, fracture toughness and drill test methods. The amount of in-situ formed hBN phase within the sintered composites was calculated by using the Rietveld method. The physical, mechanical and machinability properties of the composite were evaluated according to the calculated amount of hBN. The highest drilling speed during the test was obtained as 34.24 mm/min for the sample containing 29 wt% of hBN. Increasing the drill load from 19.61 N to 49.03 N resulted in 4.33 times increase in the drilling rate. TEM and STEM studies which were carried out for the microstructural investigations showed the internal defects as delamination bands within hBN phase formed during sintering. In addition to these analyses, novel precession electron diffraction method in TEM was utilized for orientation mapping to investigate any possible orientation relationship between SiC and in-situ synthesized hBN phase. © 2021 Elsevier Ltd and Techna Group S.r.l.
URI: https://doi.org/10.1016/j.ceramint.2021.09.190
https://hdl.handle.net/20.500.13087/2023
ISSN: 0272-8842
Appears in Collections:Matematik Bölümü Koleksiyonu
Scopus İndeksli Yayınlar Koleksiyonu
WoS İndeksli Yayınlar Koleksiyonu
Çevre Mühendisliği Bölümü Koleksiyonu

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