In-situ fabrication of TiC-Fe 3 Al cermet
| Autor: | Wonsik Lee, Gye Seok An, Yong-In Kim, Se-Hyun Ko, Sung-Churl Choi, Yeon-Gil Jung, Jin Man Jang, Bong-Geun Park |
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| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Titanium carbide Materials science Process Chemistry and Technology Metallurgy Sintering 02 engineering and technology Cermet 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry.chemical_compound chemistry Flexural strength 0103 physical sciences Volume fraction Materials Chemistry Ceramics and Composites 0210 nano-technology Ductility Aluminide |
| Zdroj: | Ceramics International. 43:5907-5913 |
| ISSN: | 0272-8842 |
| Popis: | Titanium carbide has high hardness, resistance to oxidation and abrasion while iron aluminide has proper ductility as well as good strength and excellent oxidation resistance up to high temperatures. Therefore, it can be expected TiC-iron aluminide cermet to have excellent mechanical properties as a cutting tool and a wear-resistance material. In this study, mechanical milling and hot press sintering processes were used to manufacture in-situ TiC-Fe 3 Al cermet, whose microstructure and mechanical properties were examined according to the changes in volume fraction of TiC and milling time. After 48 h of milling each mechanically alloyed powder crystallized in a TiC and Fe 3 Al biphasic material. The milled powder was hot-pressed at 1250 ℃ and 50 MPa for 30 min to obtain sintered bodies also consisting of only TiC and Fe 3 Al phases. The hard phase, TiC, had a size of 100–300 nm with overall uniform distribution decreasing as the volume fraction of TiC increased. The hardness of each sintered body showed a linearly increasing tendency according to the increase in TiC content, the hardness for 90 vol% TiC cermet being as high as 1813Hv. On the other hand, the bending strength was 1800 MPa and 1780 MPa when TiC volume fraction was 50% and 70%, respectively, while it showed an abrupt decrease up to 580 MPa at 90% TiC volume fraction. Fe 3 Al phase is effective to toughening of TiC-Fe 3 Al cermet and the volume fraction of Fe 3 Al phase significantly influences the bending strength of the cermet. |
| Databáze: | OpenAIRE |
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