Back to Search
Start Over
Electrically conductive SiC-BN composites
- Source :
- Journal of the European Ceramic Society. 36:3879-3887
- Publication Year :
- 2016
- Publisher :
- Elsevier BV, 2016.
-
Abstract
- SiC-BN composites were fabricated by conventional hot-pressing from β-SiC and h-BN powders with 2 vol% Y 2 O 3 as a sintering additive. Electrical, mechanical, and thermal properties of SiC-BN composites were investigated as a function of the BN content in the starting materials. The addition of BN suppressed the grain growth of the SiC and triggered the β → α phase transformation of the SiC in SiC-BN composites. A minimum electrical resistivity of 3.7 × 10 −2 Ω cm was obtained for the SiC-4 vol% BN composite (SBN4). This low electrical resistivity was ascribed to N-doping in the SiC lattice, which acts as a donor for supplying electrons to the conduction band. Typical values for the electrical conductivity, fracture toughness, flexural strength, and thermal conductivity of the SBN4 at room temperature were 27 Ω −1 cm −1 , 4.1 MPa m 1/2 , 566 MPa, and 87 W/m K, respectively. The SiC-4 vol% BN composite can be electrical discharge machined to form complex shapes.
- Subjects :
- 010302 applied physics
Materials science
Composite number
Sintering
02 engineering and technology
021001 nanoscience & nanotechnology
01 natural sciences
chemistry.chemical_compound
Grain growth
Thermal conductivity
Flexural strength
chemistry
Electrical resistivity and conductivity
Boron nitride
0103 physical sciences
Materials Chemistry
Ceramics and Composites
Silicon carbide
Composite material
0210 nano-technology
Subjects
Details
- ISSN :
- 09552219
- Volume :
- 36
- Database :
- OpenAIRE
- Journal :
- Journal of the European Ceramic Society
- Accession number :
- edsair.doi...........b2d689f020229b3b384aa79ee074a108