Abstract
Monolithic TiB2, TiB2-SiC, and graphene nanoplatelet (GNP)-containing TiB2–SiC-GNP composites were prepared by spark plasma sintering (SPS). The Vickers hardness and thermal conductivity values of the TiB2-SiC composites decreased with increasing SiC addition. However, SiC addition increased the fracture toughness and oxidation resistance relative to TiB2. The GNP-containing composites exhibited different behaviours depending on the GNP content and strength of the interface between the GNPs and surrounding matrix. A strong interface improved the oxidation resistance and thermal transfer properties. The highest fracture toughness values were achieved for the composites with 5 vol% GNPs, but the higher GNP loadings resulted in poorer mechanical properties and thermal conductivities. The formation of Si-depleted layers was also observed after oxidation at 1200–1400 °C for all composites.
| Original language | English |
|---|---|
| Pages (from-to) | 949-959 |
| Number of pages | 11 |
| Journal | Journal of Alloys and Compounds |
| Volume | 729 |
| DOIs | |
| Publication status | Published - 2017 |
Bibliographical note
Publisher Copyright:© 2017
Funding
The financial support for this research by the Scientific and Technological Research Council of Turkey (TUBITAK) with a project number of 215M617 is gratefully acknowledged. Authors are greatly indebted to Prof. Dr. G. Goller for providing production and characterization facilities, and also thankful to H. Sezer, B. Yavas and Prof. Dr. M. Urgen for microstructural investigations, SPS experiments and Raman measurements, respectively.
| Funders | Funder number |
|---|---|
| TUBITAK | 215M617 |
| Türkiye Bilimsel ve Teknolojik Araştirma Kurumu |
Keywords
- Densification
- Graphene nanoplatelets
- Mechanical properties
- Spark plasma sintering
- Titanium diboride