Densification, microstructure and properties of TiB2 ceramics fabricated by spark plasma sintering
- Koç University, Department of Chemistry, Rumelifeneri Yolu, 34450 Sarıyer, İstanbul (Turkey)
- Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
Highlights: • Nearly full densification of in-house processed TiB{sub 2} ceramic powders at 1500 °C. • Microstructures revealing the size and shape of TiB{sub 2} grains after SPS. • The effect of sub-micron particles on the densification during SPS. • The effect of sintering pressure on the microstructure. • Microhardness and nano-indentation measurements along with oxidation studies. - Abstract: This study reports the fabrication of high-density TiB{sub 2} ceramics at reduced temperatures (1500 °C) by using field assisted sintering technology/spark plasma sintering (FAST/SPS) technique. In-house processed TiB{sub 2} powders with high purity were employed as starting materials. The effects of SPS conditions on the sintering behavior and microstructure of TiB{sub 2} were investigated. Sub-micron character of TiB{sub 2} particles has a strong influence on the densification during SPS. Microstructural analyses revealed that the high pressure affected both the grain size and the shape of TiB{sub 2} crystallites. Elongated grains with average size of 6 μm were perceived in TiB{sub 2} sample fabricated by SPS at 1500 °C under 60 MPa pressure with a relative density of 96.7%. The microhardness and elastic modulus were measured as 27.4 GPa and 685.2 GPa, respectively. This sample revealed an improved oxidation resistance due to the formation of a thin oxidation layer on the surface when heated up to 1200 °C.
- OSTI ID:
- 22805878
- Journal Information:
- Materials Characterization, Vol. 145; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
- Country of Publication:
- United States
- Language:
- English
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