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Ni‐Coated SiC Particles: Synthesis and Densification
Author(s) -
Nechiche Mustapha,
GauthierBrunet Véronique,
Eyidi Dominique,
Azem Said,
Dubois Sylvain
Publication year - 2015
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.13763
Subject(s) - materials science , microstructure , bilayer , scanning electron microscope , coating , layer (electronics) , composite material , particle (ecology) , hot pressing , diffraction , hot isostatic pressing , chemical engineering , optics , oceanography , genetics , physics , membrane , biology , geology , engineering
The mechanofusion process, a dry particle coating route, has been successfully applied to coat micrometric SiC particles with submicrometric Ni filaments. In a first step, the mechanofusion parameters were optimized to form a continuous Ni coating onto SiC particles. In a second step, the Ni‐coated SiC particles were sintered by hot isostatic pressing. The temperature and pressure cycles were determined to ensure a good densification of the material. Such a densification process leads to the formation of a δ‐Ni 2 Si bilayer at the SiC/Ni interface; the inner δ‐Ni 2 Si layer in contact with SiC being more rich in carbon than the one in contact with the matrix. From X‐ray diffraction, wavelength‐dispersive X‐ray spectrometry and scanning electron microscopy characterizations, a mechanism is proposed to explain the microstructure of the end‐product.