Abstract
Mo-Si-B composites with boron content from 0 to 8 wt.% were prepared by spark plasma sintering using Mo, Si, and B elemental powders. The effects of boron content on the phase composition, mechanical properties, and high-temperature oxidation resistance of the Mo-Si-B composites were investigated. The results show the evolution of the major phase constitution of the composites with increasing boron content is in the following sequence: (MoSi2, Mo5Si3) → (MoSi2, Mo5Si3, Mo5SiB2) → (MoSi2, MoB) → (MoSi2, MoB, MoB2). As the boron content increases, both the hardness and flexural strength of the composites increases, but the fracture toughness of the composites gradually decreases. The strengthening mechanisms for the composites are second-phase strengthening and grain refinement strengthening. However, the formation of brittle phases, i.e., Mo5SiB2, MoB, and MoB2, reduces the toughness of the composites. In addition, since a dense barrier layer of SiO2-B2O3 formed on the surface of the composites inhibits the inward diffusion of oxygen, B-doped Mo-Si-B exhibits better oxidation resistance compared with non-doped composites.
Similar content being viewed by others
References
A.K. Vasudevan and J.J. Petrovic, A Comparative Overview of Molybdenum Disilicide Composites, Mater. Sci. Eng. A., 1992, 155, p 1–17
J.J. Petrovic, Mechanical Behavior of MoSi2 and MoSi2 Composites, Mater. Sci. Eng. A., 1995, 192–193, p 31–37
J.J. Petrovic, Toughening Strategies for MoSi2-Based High Temperature Structural Silicides Materials, Intermet, 2000, 8, p 1175–1182
B.V. Cockeram, The Fracture Toughness and Toughening Mechanism of Commercially Available Unalloyed Molybdenum and Oxide Dispersion Strengthened Molybdenum with an Equiaxed, Large Grain Structure, Metall. Mater. Trans. A, 2009, 40A, p 2843–2860
R. Li, G. Zhang, B. Li, X. Chen, S. Ren, J. Wang, and J. Sun, The Multi-Scale Microstructure and Strengthening Mechanisms of Mo-12Si-8.5BxZr (at.%) Alloys, Int. J. Refract. Met. H., 2017, 68, p 65–74
L. Sun, J.S. Pan, and C.J. Lin, Wear Behavior of TiC-MoSi2 Composites, Mater. Lett., 2003, 57, p 1239–1243
K.V. Manukyan, S.L. Kharatyan, G. Blugan, P. Kocher, and J. Kuebler, MoSi2-Si3N4 Composites: Influence of Starting Materials and Fabrication Route on Electrical and Mechanical Properties, J. Eur. Ceram. Soc., 2009, 29, p 2053–2060
H. Ramezanalizadeh and S. Heshmati-Manesh, Preparation of MoSi2-Al2O3 Nanocomposite Via MASHS Route, Int. J. Refract. Met. H., 2012, 31, p 210–217
C.L. Yeh and W.H. Chen, Combustion Synthesis of MoSi2 and MoSi2-Mo5Si3 Composites, J. Alloys Comp., 2007, 438, p 165–170
R.B. Schwarz, S.R. Srinivasan, J.J. Petrovic, and C.J. Maggiore, Synthesis of Molybdenum Disilicide by Mechanical Alloying, Mater. Sci. Eng. A, 1992, 155, p 75–83
R. Gibala, A.K. Ghosh, D.C. Van Aken, D.J. Srolovitz, A. Basu, H. Chang, D.P. Mason, and W. Yang, Mechanical Behavior and Interface Design of MoSi2-Based Alloys and Composites, Mater. Sci. Eng. A., 1992, 155, p 147–158
J.H. Yan, H.A. Zhang, S.W. Tang, and J.G. Xu, Room Temperature Mechanical Properties and High Temperature Oxidation Behavior of MoSi2 Matrix Composite Reinforced by Adding La2O3 and Mo5Si3, Mater. Charact., 2009, 60, p 447–450
J.H. Yan, J.X. Huang, K.L. Li, and Y. Wang, Microstructure and Properties of MoSi2-Mo5Si3 Composites In Situ Synthesized by Spars Plasma Sintering, T. Mater. Heat Treat., 2017, 38, p p1–10
M. Akinc, K. Meyer, M.J. Kramer, A.J. Thom, J.J. Huebsch, and B. Cook, Boron-Doped Molybdenum Silicides for Structural Applications, Mat. Sci. Eng. A., 1999, 261, p 16–23
M. Kmeyer and M. Akmc, Oxidation Behavior of Boron-Modified Mo5Si3 at 800–1 300 °C, J. Am. Ceram. Soc., 1996, 79, p 938–944
K. Ito, K. Ihara, K. Tanaka, M. Fujikura, and M. Yamaguchi, Physical and Mechanical Properties of Single Crystals of the T2 Phase in the Mo-Si-B System, Intermet, 2001, 9, p 591–602
P.R. Taleghani, S.R. Bakhshi, M. Erfanmanesh, G.H. Borhani, and R. Vafaei, Improvement of MoSi2 Oxidation Resistance Via Boron Addition: Fabrication of MoB/MoSi2 Composite by Mechanical Alloying and Subsequent Reactive Sintering, Powder Technol., 2014, 254, p 241–247
R. Mitra, A.K. Srivastava, N. Eswara Prasad, and S. Kumari, Microstructure and Mechanical Behavior of Reaction Hot Pressed Multiphase Mo-Si-B and Mo-Si-B-Al Intermetallic Alloys, Intermet, 2006, 14, p 1461–1471
J.H. Yan, Y. Wang, P. Zhou, J.W. Qiu, and Y.M. Wang, Microstructures and Room Temperature Mechanical Properties of Mo-12Si-8.5B-8Cr Alloy, Trans. Indian Inst. Met., 2018, 71(1), p 245–251
C.A. Nunes, R. Sakidja, Z. Dong, and J.H. Perepezko, Liquidus Projection for the Mo-Rich Portion of the Mo-Si-B System, Intermet, 2000, 8, p 327–337
X. Fan, K. Hack, and T. Ishigaki, Calculated C-MoSi2, and B-Mo5Si3, Pseudo-Binary Phase Diagrams for the Use in Advanced Materials Processing, Mater. Sci. Eng. A., 2000, 278, p 46–53
K.E. Spear and P.K. Liao, The B-Mo (Boron-Molybdenum) System, Bull. Alloy Phase Diag., 1988, 9, p 457–466
L.Q. Zhang, K.M. Pan, J. Wang, and J.P. Lin, Spark Plasma Sintering Synthesis of Intermetallic T2 in the Mo-Si-B System, Adv. Powder Technol., 2013, 24, p 913–920
Y. Yang and Y.A. Chang, Thermodynamic Modeling of the Mo-Si-B System, Intermet, 2005, 13, p 121–128
J.H. Schneibel and J.A. Sekhar, Microstructure and Properties of MoSi2-MoB and MoSi2-Mo5Si3 Molybdenum Silicides, Mater. Sci. Eng. A., 2003, 340, p 204–211
Y. Suzuki, T. Sekino, and K. Niihara, Effects of ZrO2 Addition on Microstructure and Mechanical Properties of MoSi2, Scripta Metall. et Mater., 1995, 33, p 69–74
J.J. Kruzic, J.H. Schneibel, and R.O. Ritchie, Fracture and Fatigue Resistance of Mo-Si-B Alloys for Ultra High-Temperature Structural Applications, Scripta Metall., 2004, 50, p 459–464
R. Li et al., Improved Fracture Toughness of a Mo-12Si-8.5B-3Zr Alloy by Grain Coarsening and its Multiple Toughening Mechanisms, J. Alloys Compd., 2018, 743, p 716–727
K. Yoshimi, S. Nakatani, T. Suda, S. Hanada, and H. Habazaki, Oxidation Behavior of Mo5SiB2-Based Alloy at Elevated Temperatures, Intermet, 2002, 10, p 407–414
AYu Potanin, YuS Pogozhev, E.A. Levashov, A.V. Novikov, N.V. Shvindina, and T.A. Sviridova, Kinetics and Oxidation Mechanism of MoSi2-MoB Ceramics in the 600–1200 °C Temperature Range, Ceram. Int., 2017, 43, p 10478–10486
Acknowledgments
This project was financially supported by the National Natural Science Foundation of China (Grant No. 51475161), and Research Foundation of Education Bureau of Hunan Province (Grant No. 15A059).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Yan, J., Huang, J., Li, K. et al. Effect of Boron Content on Microstructure, Mechanical Properties, and Oxidation Resistance of Mo-Si-B Composites. J. of Materi Eng and Perform 27, 6218–6226 (2018). https://doi.org/10.1007/s11665-018-3652-8
Received:
Revised:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11665-018-3652-8