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Graphite addition for SiC formation in diamond/SiC/Si composite preparation
- Source :
- International Journal of Minerals, Metallurgy, and Materials. 26:1166-1176
- Publication Year :
- 2019
- Publisher :
- Springer Science and Business Media LLC, 2019.
-
Abstract
- Herein, graphite was used in the Si-vapor reactive infiltration of diamond/SiC/Si composites to produce composites with various SiC contents. X-ray diffraction was used to determine the phases of the composite, whereas scanning electron microscopy was used to confirm the Si–C reaction between the silicon, graphite, and diamond and to observe the SiC morphology. Various SiC contents in the composite were observed with graphite addition. Furthermore, the reaction between silicon and graphite (diamond) produced coarse (fine) SiC particles. The generation of a 10-μm-diameter Si–C area on the surface of the diamond was observed. The thermal conductivity (TC) and coefficient of thermal expansion (CTE) of the composite was investigated, where the TC varied from 317–426 W•m−1•K−1 with the increase of the SiC volume fraction from 38% to 76% and the corresponding CTE increased from 1.7 × 10-6 to 3.7 × 10−6 K−1, respectively. Furthermore, a critical point for the CTE was found to exist at approximately 250°C, where the composite was under a hydrostatic condition. Finally, the bending strength was found to range from 241 to 341 MPa.
- Subjects :
- Materials science
Silicon
Scanning electron microscope
Mechanical Engineering
Composite number
0211 other engineering and technologies
Metals and Alloys
chemistry.chemical_element
Diamond
02 engineering and technology
engineering.material
021001 nanoscience & nanotechnology
Thermal expansion
Thermal conductivity
chemistry
Geochemistry and Petrology
Mechanics of Materials
Volume fraction
Materials Chemistry
engineering
Graphite
Composite material
0210 nano-technology
021102 mining & metallurgy
Subjects
Details
- ISSN :
- 1869103X and 16744799
- Volume :
- 26
- Database :
- OpenAIRE
- Journal :
- International Journal of Minerals, Metallurgy, and Materials
- Accession number :
- edsair.doi...........6662a32e3fc178d0895120cda43a2946