Manufacturing Technology 2020, 20(3):293-299 | DOI: 10.21062/mft.2020.056

Microstructure and Selected Properties of Si3N4 + SiC Composite

Zuzana Gábriąová, Pavol ©vec, Alena Brusilová
Institute of Technologies and Materials, Faculty of Mechanical Engineering, STU Bratislava, Námestie slobody 17, 812 31 Bratislava. Slovak Republic

The effects of strengthening phase in particulate ceramic composites on their properties were studied in presented paper. The experimental materials were a monolithic Si3N4 and particulate ceramic composites consisting of Si3N4 matrix with different additions of the SiC strengthening phase (10 and 20 vol.%). The microstructure, density, hardness and fracture toughness of Si3N4 + SiC ceramic composite materials were compared with monolithic Si3N4 based ceramic material. The addition of SiC particles into the Si3N4 based matrix does not positively influence the phase transformation from ?-Si3N4 to ?-Si3N4 in Si3N4 + SiC ceramic composite materials, but it affects the growth of prismatic ?-Si3N4 grains and contributes to the creation of fine-grained microstructure. The increase of SiC strengthening phase portion slightly increases relative density of Si3N4 + SiC ceramic composite materials. The hardness of ceramic materials increased from 14.48 GPa at monolithic Si3N4 ceramics to 16.99 GPa at ceramic composite with 20 vol.% SiC. The highest fracture toughness value of 8.30 MPa.m1/2 was achieved for monolithic Si3N4 ceramics, the lowest value of 7.09 MPa.m1/2 was achieved for ceramic composite with 20 vol.% SiC.

Keywords: silicon nitride, strengthening phase, microstructure, mechanical properties
Grants and funding:

VEGA 1/0298/18 research project.
UVP STU Bratislava ITMS 26240220084.

Received: May 1, 2020; Revised: August 5, 2020; Accepted: August 5, 2020; Prepublished online: September 3, 2020; Published: September 7, 2020  Show citation

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Gábriąová Z, ©vec P, Brusilová A. Microstructure and Selected Properties of Si3N4 + SiC Composite. Manufacturing Technology. 2020;20(3):293-299. doi: 10.21062/mft.2020.056.
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