Spark Plasma Heat Treated ZrB2-SiC and HfB2-SiC Composites

Naidu Seetala; Marquavious T. Webb

doi:10.4028/www.scientific.net/MSF.783-786.1176

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HomeMaterials Science ForumMaterials Science Forum Vols. 783-786Spark Plasma Heat Treated ZrB2-SiC and HfB2-SiC...

Spark Plasma Heat Treated ZrB₂-SiC and HfB₂-SiC Composites

Abstract:

Ultra-high-temperature ceramics (UHTC) such as ZrB₂ and HfB₂ with SiC nanofiller are useful for propulsion and thermal protection systems. ZrB₂ and HfB₂ with 10-20 wt% SiC were prepared using ultra-sonication, rotary evaporation, and spark plasma heat treatment to high temperatures (~2,000°C) and pressures (50-60 MPa). We used positron annihilation lifetime spectroscopy (PALS) to study the nanoporosity, SEM for particle size distribution, and microhardness tester for Vickers hardness. The PALS studies were performed using a ²²Na positron source and the positron lifetime spectra were analyzed to three components using POSFIT program. The first and second components are related to positrons annihilating in bulk and in vacancy clusters, respectively; and the third component to positronium annihilation in nanopores within the granules. The PALS results indicate that HfB₂ has larger vacancy clusters and nanopores with lesser concentrations compared to ZrB₂ and SiC. The SEM observations showed that HfB₂ has larger particles compared to ZrB₂ and SiC showed wide range of size distribution. The Vickers-Hardness Number (VHN) is measured for spark plasma heat treated composites using a microhardness tester and the results indicate that 10wt%SiC composite has higher hardness compared to 20wt%SiC in both ZrB₂-SiC and HfB₂-SiC composites. HfB₂-SiC composites seem to be more brittle compared to ZrB₂-SiC composites. This may be due to larger size and smoother surface of HfB₂ particles (600 nm) compared to ZrB₂ particles (240 nm).

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Materials Science Forum (Volumes 783-786)

Pages:

1176-1181

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.783-786.1176

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Online since:

May 2014

Authors:

Naidu Seetala, Marquavious T. Webb

Keywords:

Free Volume, Mechanical Property, Microhardness, Nanoporosity, Positron Lifetime, Ultra-High-Temperature Ceramics, Vacancy Defects

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References

[1] W. G. Fahrenholtz, G. E. Hilmas, I. G. Talmy, and J. A. Zaykoski, Refractory diborides of zirconium and hafnium, J. Am. Ceram. Soc. 90 (2007) 1347-1364.

DOI: 10.1111/j.1551-2916.2007.01583.x

Google Scholar

[2] Q. Liu, W. Han, X. Zhang, S. Wang, and J. Han, Microstructure and mechanical properties of ZrB2-SiC composites, Materials Letters 63 (2009) 1323-1325.

DOI: 10.1016/j.matlet.2009.02.054

Google Scholar

[3] R. Licheri, R. Orrù, A. M. Locci, and G. Cao, Efficient synthesis/sintering routes to obtain fully dense ZrB2-SiC ultra-high-temperature ceramics, Ind. Eng. Chem. Res. 46 (2007) 9087- 9096.

DOI: 10.1021/ie0701423

Google Scholar

[4] R. Licheri, R. Orrù, C. Musa, A. M. Locci, and G. Cao, Consolidation via spark plasma sintering of HfB2/SiC and HfB2/HfC/SiC composite powders obtained by self-propagating high-temperature synthesis, J. Alloys Compd. 478 (2009) 572-578.

DOI: 10.1016/j.jallcom.2008.11.092

Google Scholar

[5] T. E. M. Staab, M. J. Puska, M. Hakala, A. Sieck, M. Haugk, T. Frauenheim, and H. S. Leipner, Irradiation experiment revisited – Stability and positron lifetime of large vacancy clusters in silicon, Materials Science Forum 363-365 (2001) 135-137.

DOI: 10.4028/www.scientific.net/msf.363-365.135

Google Scholar

[6] M. Mizuno, H. Araki, and Y. Shirai, Theoretical calculations of positron lifetimes for metal oxides, Mater. Trans. 45 (2004) 1964-(1967).

DOI: 10.2320/matertrans.45.1964

Google Scholar

[7] Y. C. Jean, Free-volume properties of polymers probed by positron annihilation spectroscopy, Mater. Sci. Forum, 105-110 (1992) 309-316.

DOI: 10.4028/www.scientific.net/msf.105-110.309

Google Scholar

[8] R. Morsya, M. Elsayed, R. Krause-Rehberg, G. Dlubek, and T. Elnimr, Positron annihilation spectroscopic study of hydrothemally synthesized fine nanoporous hydroxyapatite agglomerates, J. Euro. Ceramic Soc. 30 (2010) 1897–(1901).

DOI: 10.1016/j.jeurceramsoc.2010.03.014

Google Scholar

[9] J. Marschall, D. C. Erlich, H. Manning, W. Duppler, D. Ellerby, and M. Gasch, Microhardness and high-velocity impact resistance of HfB2/SiC and ZrB2/SiC composites, J. Mater. Sci. 39 (2004) 5959-5968.

DOI: 10.1023/b:jmsc.0000041692.72915.e8

Google Scholar

[10] R. K. Enneti, C. Carney, S. Park, and S. V. Atre, Taguchi analysis on the effect of process parameters on densification during spark plasma sintering of HfB2-20SiC, Int. J. Refractory Metals & Hard Matter. 31 (2012) 293-296.

DOI: 10.1016/j.ijrmhm.2011.11.001

Google Scholar