Thermodynamic Study on Self-propagating High Temperature Synthesis of TiB₂/Fe Composites

Abstract

Based on the experimental analysis and theoretical calculation, the self-propagating high temperature synthesis of TiB₂/Fe composite was studied. The experimental results show that the interfacial between TiB₂ and Fe was smooth and clear, and the composite bending strength increased with the addition of Fe, however, the hardness decreased accordingly. The thermodynamics of the composites preparation process was calculated. The calculation results show that the primary chemical reaction was the reaction between Ti and B. The extra B can react with Fe, producing the brittle phase Fe₂B. By increasing Ti, the production of Fe₂B will decrease and a few of Ti-Fe intermetallic compound will be produced by the reaction between Ti and Fe in the composites. Finally, according to the Merzhanov condition of the adiabatic system, it is concluded that the Fe content must be selected between 16.3% and 54.3% by the thermodynamics temperature of reaction calculation.

Keywords

titanium borides / iron matrix composites / self-propagating / thermodynamics

References

[1] Ni LZ, Chen Q. Science and Engineering of Composite Materials[M], 2002 Beijing: Science Press. 397-403.

[2] Munro RG. Material Properties of Titanium Diboride[J]. J. Res. Natl. Inst. Stan, 2000, 105: 709-720.

[3] Spoor PS, Maynard JD, Pan MJ, et al. Elastic Constants and Crystal Anisotropy of Titanium Diboride[J]. Appl. Phys. Lett., 1997, 70(15): 1 959-1 961.

[4] Mchale AE, Mcmurdie HF, Ondik HM, et al. Borides, Carbides, and Nitrides[M], 1994 140-141.

[5] Chetta V. Wetting of Iron on Sintered TiB₂[J]. Solid State Phenomena, 1992, 25: 105-114.

[6] Kiyotaka M, Yuki O, Keisuke K. Combustion Synthesis of Boride Particle Dispersed Hard Metal from Elemental Powders[J]. Int. J. Refract. Met. H, 2009, 27: 376-381.

[7] Jonghoon K, Bonggyu P, Yongho P, et al. Mechanical Properties of in-situ FeAl-TiB₂ Intermetallic Matrix Composites[J]. Int. J. Mod. Phys. B, 2009, 23(6-7): 1 479-1 484.

[8] Takashi S, Kouji T. High-modulus Iron-based Alloy with a Dispersed Boride[P]. United States Patent No. 5854434A

[9] Mukhopadhyay A, Raju GB, et al. Correlation between Phase Evolution, Mechanical Properties and Instrumented Indentation Response of TiB₂-based Ceramics[J]. J. Eur. Ceram. Soc., 2009, 29(3): 505-516.

[10] Limei C, Sylvie LK, Michael W, et al. Interface Structure and Chemistry in a Novel Steel-based Composite Fe-TiB₂ Obtained by Eutectic Solidification[J]. Acta Mater., 2012, 60: 6382-6389.

[11] Animesh A, Bandyopadhyay TK, Karabi D. Synthesis and Characterization of TiB₂-reinforced Iron-based Composites[J]. J Mater. Process Tech., 2006, 172: 70-76.

[12] Zhao LX, Jiang QC. High Temperature Wear Properties of the TiC _x, TiC _x-TiB ₂ Particulate Reinforce Steel Matrix Composites[D], 2010 Jilin: Jilin University.

[13] Du BS, Zou ZD. Study on in-situ Synthesized Ceramic Phase Reinforced Fe-based Coating by Laser Cladding[D], 2009 Shandong: Shandong University.

[14] Wang ZT, Zhou XH, Zhang XY, et al. Solidification Characteristic and Formation Mechanism ofn in-situ Synthesized TiC-TiB₂ Reinforced Fe Matrix Composite Coating[J]. T. Mater. Heat Treat., 2009, 30(3): 154-159.

[15] Gao RG. Development and Application of TiB₂ Based Cermet[J]. Cemented Carbide, 1998, 15(1): 235-240.

[16] Ye DL, Hu JH. The Thermodynamic Data of Inorganic Materials Handbook[M], 2002 Beijing: Metallurgical Industry Press. 130-1 060.

[17] Fedrizzi A, Pellizzari M, Zadra M, et al. Microstructural Study and Densification Analysis of Hot Work Tool Steel Matrix Composites Reinforced with TiB₂ Particles[J]. Mater. Charact., 2013, 86: 69-79.

[18] Munir ZA, Holt JB. Combustion and Plasma Synthesis of High-Temperature Materials[M], 1990 New York: VCH publisher. 1-53.

[19] Ponomarev MA, Loryan VE, Shchukin AS, et al. SHS in Preliminary Structured Compacts: II. Ti-2B and Ti-Al Blends[J]. Int. J. Self-Propag. High-Temp. Synth., 2013, 22(4): 202-209.