Preparation and mechanical properties of laminated zirconium diboride/molybdenum composites sintered by spark plasma sintering

Abstract

Laminated ZrB₂/Mo composites, alternately consisting of matrix layers of 80 vol.% ZrB₂ +10 vol.% nano-SiC whiskers +10 vol.% SiC particles and Mo interlayers, with the addition of Si and B as interlayer adjusting agent, were prepared by roll-compaction and spark plasma sintering (at 1600°C) process. XRD and SEM techniques were used to characterize the phases and microstructure of the obtained composites. The results showed that without the addition of Si and B in the interlayer, interfacial debonding between the matrix layer and interlayer often occurred due to the thermal mismatch between the two kinds of layers. However, the interfacial mismatch could be effectively inhibited by the addition of Si and B to the Mo interlayers. The laminated ZrB₂/Mo composites with 6 at.% Si and 4 at.% B in the interlayers showed the highest bending strength at (451±20) MPa and the highest fracture toughness at (7.52±0.12) MPa∙m^{1/ 2}. MoB, ZrB and Mo₅SiB₂ were formed by the reactions among ZrB₂, Mo and the additions.

Keywords

zirconium diboride(ZrB₂) / ceramics matrix composites / laminated / spark plasma sintering(SPS)

References

[1] Monteverde F, Bellosi A, Guicciardi S. Processing and properties of zirconium diboride-based composites. Journal of the European Ceramic Society, 2002, 22(3): 279-288

[2] Fahrenholtz W G. Thermodynamic analysis of ZrB₂-SiC oxidation: formation of a SiC-depleted region. Journal of the American Ceramic Society, 2007, 90(1): 143-148

[3] Zhu S, Fahrenholtz W G, Hilmas G E. Enhanced densification and mechanical properties of ZrB₂-SiC processed by a preceramic polymer coating route. Scripta Materials, 2008, 59(1): 123-126

[4] Monteverde F, Savino R. Stability of ultra-high-temperature ZrB₂-SiC ceramics under simulated atmospheric re-entry conditions. Journal of the European Ceramic Society, 2007, 27(16): 4797-4805

[5] Zimmermanna J W, Hilmas G E, Fahrenholtz W G, . Fabrication and properties of reactively hot pressed ZrB₂-SiC ceramics. Journal of the European Ceramic Society, 2007, 27(7): 2729-2736

[6] Yan Y, Zhang H, Huang Z, . In situ synthesis of ultrafine ZrB₂-SiC composite powders and the pressureless sintering behaviors. Journal of the American Ceramic Society, 2008, 91(4): 1372-1376

[7] Monteverde F, Bellosi A. Development and characterization of metal-diboride-based composites toughened with ultra-fine SiC particulates. Solid State Science, 2005, 7(5): 622-630

[8] Chamberlain A L, Fahrenholtz W G, Hilmas G E, . High-strength zirconium diboride-based ceramics. Journal of the American Ceramic Society, 2004, 87(6): 1170-1172

[9] Yang F Y, Zhang X H, Han J C, . Processing and mechanical properties of short carbon fibers toughened zirconium diboride-based ceramics. Materials Design, 2008, 29(9): 1817-1820

[10] Zhang X H, Xu L, Han W B, . Microstructure and properties of silicon carbide whisker reinforced zirconium diboride ultra-high temperature ceramics. Solid State Science, 2009, 11(1): 156-161

[11] Wang H L, Wang C A, Zhang R, . Mechanical properties of ZrB2-based ceramics reinforced by nano-SiC whiskers. Key Engineering Materials, 2007, 353-358: 1564-1567

[12] Clegg W J, Kendall K, Alford N M. A simple way to make tough ceramics. Nature, 1990, 347(6292): 455-457

[13] Wang C A, Huang Y, Zan Q F, , Control of composition and structure in laminated silicon nitride/boron nitride composites.βJournal of the American Ceramic Society, 2002, 85(10): 2457-2461

[14] Upadhya K, Yang J M, Hoffman W. Materials for ultrahigh temperature structural applications. American Ceramic Society Bulletin, 1997, 76(12): 51-56

[15] Anselmi-Tamburini U, Garay J E, Munir Z A. Fundamental investigations on the spark plasma sintering/synthesis process: III. Current effect on reactivity. Materials Science and Engineering A, 2005, 407(1-2): 24-30

[16] Bellosi A, Monteverde F, Sciti D. Fast densification of ultra-high temperature ceramics by spark plasma sintering. International Journal of Applied Ceramic Technology, 2006, 3(1): 32-40

[17] Wang H L, Wang C A, Yao X F, . Processing and mechanical properties of zirconium diboride-based ceramics prepared by spark plasma sintering. Journal of the American Ceramic Society, 2007, 90(7): 1992-1997

[18] Choe H, Chen D, Schneibel J H. Ambient to high temperature fracture toughness and fatigue-crack propagation behavior in a Mo-12Si-8.5B (at.%) intermetallic. Intermetallics, 2001, 9(4): 319-329

[19] Sbaizero O, Lucchini E. Influence of residual stresses on the mechanical properties of a layered ceramic composite. Journal of the European Ceramic Society, 1996, 16(8): 813-816

[20] Pascual J, Lubea T, Danzer R. Fracture statistics of ceramic laminates strengthened by compressive residual stresses. Journal of the European Ceramic Society, 2008, 28(8): 1551-1556

[21] Silva A C, Kaufman M J. Synthesis of MoSi₂-boride composites through in situdisplacement reactions. Intermetallics, 1997, 5(1): 1-15

[22] Zan Q F, Wang C A, Huang Y. Residual stress analysis in the Al₂O₃/Ti₃SiC₂ multilayer composites. Rare Metal Materials and Engineering,β2002, 31(Suppl. 1): 137-140 (in Chinese)

[23] Bao Y W, Su S B, Huang J L. An uneven strain model for analysis of residual stress and interface stress in laminate composites. Journal of Composite Materials, 2002, 36(14): 1769-1778

Acknowledgements

This work was supported by the 973 Program of MOST (Grant No. 5133102-4). The authors would like to thank the Institution of Composites, Harbin Institute of Technology for its support.

RIGHTS & PERMISSIONS

2014 Higher Education Press and Springer-Verlag Berlin Heidelberg