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M. Chmielewski, K. Pietrzak, A. Strojny-Nędza, D. Jarząbek and S. Nosewicz

Abstract

This paper analyses the technological aspects of the interface formation in the copper-silicon carbide composite and its effect on the material’s microstructure and properties. Cu-SiC composites with two different volume content of ceramic reinforcement were fabricated by hot pressing (HP) and spark plasma sintering (SPS) technique. In order to protect SiC surface from its decomposition, the powder was coated with a thin tungsten layer using plasma vapour deposition (PVD) method. Microstructural analyses provided by scanning electron microscopy revealed the significant differences at metal-ceramic interface. Adhesion force and fracture strength of the interface between SiC particles and copper matrix were measured. Thermal conductivity of composites was determined using laser flash method. The obtained results are discussed with reference to changes in the area of metal-ceramic boundary.

Open access

A. Strojny-Nędza, K. Pietrzak, M. Teodorczyk, M. Basista, W. Węglewski and M. Chmielewski

Abstract

This paper describes the process of obtaining Cu-SiC-Cu systems by way of spark plasma sintering. A monocrystalline form of silicon carbide (6H-SiC type) was applied in the experiment. Additionally, silicon carbide samples were covered with a layer of tungsten and molybdenum using chemical vapour deposition (CVD) technique. Microstructural examinations and thermal properties measurements were performed. A special attention was put to the metal-ceramic interface. During annealing at a high temperature, copper reacts with silicon carbide. To prevent the decomposition of silicon carbide two types of coating (tungsten and molybdenum) were applied. The effect of covering SiC with the aforementioned elements on the composite’s thermal conductivity was analyzed. Results were compared with the numerical modelling of heat transfer in Cu-SiC-Cu systems. Certain possible reasons behind differences in measurements and modelling results were discussed.

Open access

H.-S Kim, M. Babu and S.-J. Hong

Abstract

TAGS-90 compound powder was directly prepared from the elements by high-energy ball milling (HEBM) and subsequently consolidated by a spark plasma sintering (SPS). Effect of milling time on the microstructure and thermoelectric properties of the samples were investigated. The particle size of fabricated powders were decreased with increasing milling time, finally fine particles with ~1μm size was obtained at 90 min. The SPS samples exhibited higher relative densities (>99%) with fine grain size. X-ray diffraction analysis (XRD) and energy dispersion analysis (EDS) results revealed that all the samples were single phase of GeTe with exact composition. The electrical conductivity of samples were decreased with milling time, whereas Seebeck coefficient increased over the temperature range of RT~450°C. The highest power factor was 1.12×10−3W/mK2 obtained for the sample with 90 min milling at 450°C.

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Yuqi Chen, Liang Li and Shinji Hirai

Abstract

Single-phase Eu3S4 was obtained via CS2 gas sulfurization of Eu2O3 nanospheres at 773 K for longer than 0.5 h. The primary particle size of Eu3S4 became larger than that of Eu2O3 during the sulfurization process. Pure synthetic Eu3S4 powders were unstable and transformed to EuS at 873 K under vacuum. Eu3S4 compacts were sintered in temperature range of 773 K to 1173 K and they transformed to EuS at 1473 K during spark plasma sintering. Specific heat of sintered Eu3S4 did not show an anomalous behavior in the range of 2 K to 50 K. The magnetic susceptibility of polycrystalline Eu3S4 followed a Curie-Weiss law from 2 K to 300 K. Magnetization of polycrystalline Eu3S4 was larger than that of single crystal Eu3S4 when the magnetic field was less than 3.5 kOe.

Open access

P. Oslanec and M. Škrobian

Mezbahul-Islam, Ahmad Omar Mostafa, Mamoun Medraj Hindawi: Journal of Materials, vol. 2014, Article ID 704283 http://dx.doi.org/10.1155/2014/704283 [6] Pieczonka, T., Schubert, T., Baunack, S.: Sintering Behaviour of Aluminium in Different Atmospheres [7] Chua, AS., Brochu, M., Bishop, DP.: Spark plasma sintering of prealloyed aluminium powders [8] Czerwinski, F.: JOM, May, 2004 [9] Krasovskii, PV.: Inorganic materials, vol. 50, 2014, p.1480, DOI: 10.1134/S0020168514150059 [10] Colombo, A.: Analytica Chimica Acta, vol. 81, 1976, p. 397

Open access

Kamil Kornaus, Agnieszka Gubernat, Dariusz Zientara, Paweł Rutkowski and Ludosław Stobierski

LITERUTRE CITED 1. Toth, LE. Transition metal carbides and nitrides. New York: Academic Press; 1971. 2. Gubernat, A. & Stobierski, L. (2009). Węgliki metalopodobne Cz. I. Badania nad spiekaniem. Cer. Mat. 61(2), 113–118 from PTCer database on the World Wide Web: http://ptcer.pl/mccm/pl/szczegoly-artykulu/61/2/139 3. Cha, S.I. & Hong, S.H. (2003). Microstructures of binderless tungsten carbides sintered by spark plasma sintering process. Mater. Sci. Eng. A 356(1), 381–389. DOI: 10.1016/S0921-5093(03)00151-5. 4. Zhao, J., Holland, T

Open access

E. Drożdż, M. Jelonek, J. Wyrwa and M. Rękas

, Materials Science and Engineering A335 , 246-252 (2002). [13] S. Li, H. Izui, M. Okano, W. Zhang, T. Watanabe, Microstructure and echanical properties of ZrO 2 (Y 2 O 3 )-Al 2 O 3 nanocomposites prepared by spark plasma sintering, Particuology 10 , 345-351 (2013). [14] M. Marinsek, K. Zupan, Microstructure evaluation of sintered combustion-derived fine powder NiO-YSZ. Ceramics International 36 , 1075-1082 (2010).

Open access

I. Sulima, L. Jaworska and J. Karwan-Baczewska

References [1] M. Darabara, G.D. Papadimitriou, L. Bourithis, Production of Fe-B-TiB2 metal matrix composites on steel surface, Surf. Coat. Technol. 201, 3518-3523 (2006). [2] Li B., Liu Y., Li J. Cao H., He L., Effect of sintering process on the microstructures and properties of in situ TiB2-TiC reinforced steel matrix composites produced by spark plasma sintering, Journal of Materials Processing Technology 210, 1, 91-95 (2010). [3] A. Fedrizzi, M. Pellizzari, M. Zadra, E. Marin,Microstructural study and

Open access

S. Lavrynenko, E. Gevorkyan, W. Kucharczyk, L. Chalko and M. Rucki

two types of Al2O3/TiC ceramic cutting tool material at room and elevated temperatures. Ceramics International, 43 (2017) 13869-13874. 10. Basu B., Lee J.H., Kim D.Y.: Development of WC-ZrO 2 nanocomposites by spark plasma sintering. J. Am. Ceram. Soc., 87(2) (2004) 317–319. 11. Malek O., Lauwers B., Perez Y., Baets P., Vleugels J.: Processing of ultrafine ZrO 2 toughened WC composites. J. Eur. Ceram. Soc., 29(16) (2009) 3371–3378. 12. Pedzich Z., Haberko K., Piekarczyk J., Faryna M., Litynska L.: Zirconia matrix-tungsten carbide particulate

Open access

W. Wołczyński, C. Senderowski, J. Morgiel and G. Garzeł

, Mechanical properties ofaforged fe-25Al-2Ta steam turbine blade, Intermetallics 18, 1379-1384 (2010). [10] A. Hotar, M. Palm, Oxidation resistance of the Fe-25Al-2Ta (at.%) in air, Intermetallics 18, 1390-1395 (2010). [11] T. Skiba, P. Hausild, M. Karlik, K. Vanmeensel, J. Vleugels, Mechanical properties of spark plasma sintered FeAl intermetallics, Intermetallics 18, 1410-1414 (2010). [12] R. Musalek, O. Kovarik, T. Skiba, P. Hausild, M. Karlik, J. Colmenares - Angulo, Fatigue properties of Fe-Al intermetallic coatings