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Article

C0.3N0.7Ti-SiC Toughed Silicon Nitride Hybrids with Non-Oxide Additives Ti3SiC2

1
School of Physics and Electronics, Central South University, Changsha 410083, China
2
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
3
Innovation Research Team for Advanced Ceramics, Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China
*
Author to whom correspondence should be addressed.
Materials 2020, 13(6), 1428; https://doi.org/10.3390/ma13061428
Received: 28 February 2020 / Revised: 17 March 2020 / Accepted: 18 March 2020 / Published: 20 March 2020
(This article belongs to the Special Issue Application of Transition Metal Compounds in Material Sciences)
In situ grown C0.3N0.7Ti and SiC, which derived from non-oxide additives Ti3SiC2, are proposed to densify silicon nitride (Si3N4) ceramics with enhanced mechanical performance via hot-press sintering. Remarkable increase of density from 79.20% to 95.48% could be achieved for Si3N4 ceramics with 5 vol.% Ti3SiC2 when sintered at 1600 °C. As expected, higher sintering temperature 1700 °C could further promote densification of Si3N4 ceramics filled with Ti3SiC2. The capillarity of decomposed Si from Ti3SiC2, and in situ reaction between nonstoichiometric TiCx and Si3N4 were believed to be responsible for densification of Si3N4 ceramics. An obvious enhancement of flexural strength and fracture toughness for Si3N4 with x vol.% Ti3SiC2 (x = 1~20) ceramics was observed. The maximum flexural strength of 795 MPa for Si3N4 composites with 5 vol.% Ti3SiC2 and maximum fracture toughness of 6.97 MPa·m1/2 for Si3N4 composites with 20 vol.% Ti3SiC2 are achieved via hot-press sintering at 1700 °C. Pull out of elongated Si3N4 grains, crack bridging, crack branching and crack deflection were demonstrated to dominate enhance fracture toughness of Si3N4 composites. View Full-Text
Keywords: Ti3SiC2; Si3N4; mechanical properties; fracture toughness Ti3SiC2; Si3N4; mechanical properties; fracture toughness
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MDPI and ACS Style

Luo, H.; Li, C.; Deng, L.; Li, Y.; Xiao, P.; Zhang, H. C0.3N0.7Ti-SiC Toughed Silicon Nitride Hybrids with Non-Oxide Additives Ti3SiC2. Materials 2020, 13, 1428. https://doi.org/10.3390/ma13061428

AMA Style

Luo H, Li C, Deng L, Li Y, Xiao P, Zhang H. C0.3N0.7Ti-SiC Toughed Silicon Nitride Hybrids with Non-Oxide Additives Ti3SiC2. Materials. 2020; 13(6):1428. https://doi.org/10.3390/ma13061428

Chicago/Turabian Style

Luo, Heng; Li, Chen; Deng, Lianwen; Li, Yang; Xiao, Peng; Zhang, Haibin. 2020. "C0.3N0.7Ti-SiC Toughed Silicon Nitride Hybrids with Non-Oxide Additives Ti3SiC2" Materials 13, no. 6: 1428. https://doi.org/10.3390/ma13061428

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