In Situ Synthesis of TiB₂-TiC_0.8-40vol%SiC by Hot Pressing

Abstract:

TiB2-TiC0.8-40vol%SiC multiphase ceramics were prepared by in-situ hotpressing sintering. The phase composition and microstructures of the materials were characterized by optical mic- oscope, X-ray diffraction and scanning electron microscopy. The effects of sintering temperature on the phases, microstructures and mechanical properties of the ceramics were investigated. The results show that density, bending strength and fracture toughness of the ceramics are increased with the elevation of sintering temperature (1800-1950°C). High densified TiB2-TiC0.8-40vol%SiC multipha- se ceramics and optimized microstructure is obtained by sintering at 1900°C, in which the uniform distribution of lath-shape TiB2 and bulk TiC0.8 grains can be observed obviously. Nano-SiC particles distributed dispersively in the TiB2 and TiC0.8 grains and at boundaries. The Vickers hardness, fract- ure toughness, flexural strength and electrical conductivity of the TiB2-TiC0.8-40vol%SiC multipha- se ceramics sintered at 1900°C are 24.055GPa, 8.27±1.0MPa∙m1/2, 516.69MPa and 2.2×106S∙m-1, respectively. However, up to 1950°C, TiB2 and TiC0.8 grains gradually grew up, the bending stren- gth of multiphase ceramics was decreased greatly. In addition, TiB2, TiC0.8 and SiC particles were incorporated together to improve the particulate strength and toughness of composite material by the synergistic mechanism effects among the crystal phases in the multiphase ceramics, such as crack deflection, grain’s pull-out and fine-grain toughening.

• Periodical: Advanced Materials Research (Volume 813)
• Pages: 179-187
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.813.179
• Online since: September 2013
• Authors: Pei Qiu Sun, De Gui Zhu, Xiao Song Jiang, Hong Liang Sun, Song Chen
• Keywords: Hot-Pressing, In Situ Synthesis, Multiphase Ceramics, TiB₂-TiC_0.8-SiC

References

[1] F. D. Mestral, F. Thevenot, Ceramic composites: TiB2-TiC-SiC PartІ: properties and microstruc- ctures in the ternary system, J. Mater. Sci. 26 (20) (1991) 5547-5560.

DOI: 10.1007/bf02403957

[2] D. Vallauri, I. C. Atlas, A. Chrysanth-ou, TiC-TiB2 composites: a review of phase relationships, processing and properties, J. Eur. Ceram. Soc. 28 (8) (2008) 1697-1713.

DOI: 10.1016/j.jeurceramsoc.2007.11.011

[3] X. M. Min, T. Wang, Chemical bond and property of TiC-TiB2 composites, Mater. Sci. Forum 689 (64) (2011) 64-68.

[4] Z. M. Zhao, L. Zhang, W. Y. Liu, et al., Bulk ultrahard composites in the eutectic TiB2-TiC system by SHS under high gravity, Int. J. Self- Propag. High-Temp Synth. 18 (3) (2009) 186-193.

DOI: 10.3103/s1061386209030091

[5] J. Cabrero, J. Cabrero, F. Audubert, et al., Fabrication and characterization of sintered TiC–SiC composites, J. Eur. Ceram. Soc. 31 (3) (2011) 313-320.

DOI: 10.1016/j.jeurceramsoc.2010.10.010

[6] J. Ghosh, S. Mazumdar, M. Das, et al., Microstructural characterization of amorphous and nanocrystalline boron nitride prepared by high-energy ball milling, Mater. Res. Bull. 43 (4) (2008) 1023-1031.

DOI: 10.1016/j.materresbull.2007.04.022

[7] D. V. Dudina, D. M. Hulbert,D. Jiang, et al., In situ boron carbide titanium diboride composites prepared by mechanical milling and subsequent sparking plasma sintering, J. Mater. Sci. 43 (10) (2008) 3569-3576.

DOI: 10.1007/s10853-008-2563-8

[8] H. Wang, W. Wu, S. Sun, et al., Characterization of the structure of TiB2/TiC nanocomposite powders fabricated by high-energy ball milling, Ceram. Int. 37 (7) (2011) 2689-2693.

DOI: 10.1016/j.ceramint.2011.04.014

[9] D. G. Zhu, X. D. Yin, C. Xiao, In situ synthesized TiB2-TiC-SiC ceramic composite, Xinan Jiaotong Daxue Xuebao 34 (1) (1999) 71-74.

[10] D. Bucevac, S. Boskovic, B. Matovic, et al, Toughening of SiC matrix with in-situ created TiB2 particles, Ceram. Int. 36 (7) (2010) 2181-2188.

DOI: 10.1016/j.ceramint.2010.06.001

[11] W. Wang, J. B. Lian, H. Q. Ru, Study on synthetic conditions of TiB2/SiC ceramic composite, J. Mater. Metall. 10 (1) (2011) 23-29.

[12] W. Wang, J. B. Lian, X. Y. Yue, et al, In-situ synthesized TiB2 toughened SiC microstructure and fracture toughness, Dongbei Daxue Xuebao, 32 (11) (2011) 1579-1581.

[13] J. Yang, L. M. Pan, W. Gu, et al, Microstructure and mechanical properties of in situ synthesized (TiB2+TiC)/Ti3SiC2 composites, Ceram. Int. 38 (1) (2012) 649-655.

DOI: 10.1016/j.ceramint.2011.06.066

[14] H. L. Sun, In-situ synthesis and oxidation behaviors of TiB2-TiCx composites, Southwest Jiaotong University, Chengdu , (2005).

[15] J. Jiang, D. G. Zhu, L. H. Wang, In situ synthesis of TiB2-TiCx ceramic matrix composite by hot iosostatic pressing, Journal of Southwest Jiaotong University 39 (1) (2004) 132-139.

[16] D. Brodkin, S. R. Kalidindi, M. W. Barsoum, et al., Microstructural evolution during transient plastic phase processing of titanium carbide-titanium boride composites, J. Am. Ceram Soc. 79 (7) (1996) 1945-(1952).

DOI: 10.1111/j.1151-2916.1996.tb08017.x

[17] H. L. Sun, D. G. Zhu, Microstructures of in-situ TiB2-TiCx multiphase ceramics, J. Ceram. 26 (3) (2005) 159-162.

[18] M. W. Barsoum, B. Houng, Transient plastic phase processing of titanium-boron-carbon composites, J. Am. Ceram. Soc. 76 (6) (1993): 1445-1451.

DOI: 10.1111/j.1151-2916.1993.tb03924.x

[19] J.L. Murray, P. K. Liao, K. E. Spear, The B-Ti(boron- titanium) system, BULLAPD 7 (6) (1986) 550-553.

[20] Y. C. Wang, Z. Y. Fu, Percolation model of TiB2 and BN multiphase ceramics, Acta Mater. 19(1) (2002) 49-53.