Search Results

You are looking at 11 - 20 of 472 items for :

Clear All
Open access

A. Kozik, M. Nowak, M. Gawlik, M. Bigaj and M. Karaś

References [1] I.Dobosz, E.Rudnik, L.Burzyńska, Codeposition of SiC particles with electrolytic nickel, Archives of Metallurgy and Materials 56, 3 (2011). [2] I. Napłoszek-Bilnik, A. Budniok, B. Łosiewicz, L. Pająk, E. Łągiewka, Electrodeposition of composite Ni-based coatings with addition of Ti and/or Al particles, The Solid Films 474, 146-153 (2005). [3] A. Wyszyńska, M. Trzaska, Kinetyka osadzania warstw kompozytowych Ni-P-Si3N4, Kompozyty 3 (2006) 8-11 [4] S. Mohajeri, A. Dolati, S

Open access

Y.-K. Jeong, Y.S. Kim and S.-T. Oh

Abstract

An optimum route to fabricate the Cu-based SiC composites with homogeneous microstructure was investigated. Three methods for developing the densified composites with sound interface between Cu and SiC were compared on the basis of the resulting microstructures. Starting with three powder mixtures of elemental Cu and SiC, elemental Cu and PCS coated SiC or PCS and Cunitrate coated SiC was used to obtain Cu-based SiC composites. SEM analysis revealed that the composite fabricated by spark plasma sintering using elemental SiC and Cu powder mixture showed inhomogeneous microstructure. Conversely, dense microstructure with sound interface was observed in the sintered composites using powder mixture of pre-coated PCS and Cu-nitrate onto SiC. The relationship between powder processing and microstructure was discussed based on the role of coating layer for the wettability

Open access

Alfio Torrisi, Przemysław Wachulak, Lorenzo Torrisi, Andrzej Bartnik, Łukasz Węgrzyński and Henryk Fiedorowicz

., Mazzillo, M., Ceccio, G., & Cannavò, A. (2015). Laser-plasma X-ray detection by using fast 4H-SiC interdigit and ion collector detectors. J. Instrum., 10, P07009. DOI: 10.1088/1748-0221/10/07/P07009. 7. Cannavò, A., Torrisi, L., & Calcagno, L. (2016). SiC detector characterization for radiation emitted by laser-generated plasmas. J. Instrum. (submitted). 8. Mazzillo, M., Condorelli, G., Castagna, M. E., Catania, G., Sciuto, A., Roccaforte, F., & Raineri, V. (2009). Highly efficient low reverse biased 4H-SiC Schottky photodiodes for UV

Open access

E. Przełożyńska, K.N. Braszczyńska-Malika and M. Mróz

References [1] Hai, Z.Y. & Xing, Y.L. (2004). Review of recent studies studies in magnesium matrix composites. Journal of Material Science 39, 6153÷6171. [2] Dieringa, H. (2013). Applications: magnesium-based metal matrix composites (MMCs). Fundamentals of magnesium alloy metallurgy (317÷341). UK: Woodhead Publishing Limited. [3] Braszczyńska, K.N., Lityńska, L., Zyska, A. & Baliga, W. (2003). TEM analyses of the interfaces between components in magnesium matrix composites reinforced with SiC particles

Open access

M. Łągiewka and Z. Konopka

. Cambridge: Cambridge University Press. [8] Braszczyńska, K. & Bochenek, A. (1996). Effect of Structre on Mechanical Properties of CuTi-SiC Composites. Materials Engineering . 4, 117-121. [9] Braszczyńska, K. & Bochenek, A. (1997). Wear Abrasion Properties of the Cu-SiC. Materials Engineering . 1, 21-26. [10] Deusi, R.L., Subramanian, C. & Yellup, J.M. (1997). Dry Sliping Wear of Aluminium Composites. Composites Sc. And Tech . 57(4), 415-433. [11] Ames, W. & Aplas, A.T. (1995). Wear Mechanism in Hybrid Composites of Graphite - 20Pct SiC in A356 Aluminium Alloy

Open access

S.-R. Bang, D.-M. Yim, D.-H. Riu and S.-T. Oh

Abstract

SiC/Cu composite powders with the barrier coating of SiC-Al onto SiC powders were synthesized from Al-containing polycarbosilane precursor and Cu-nitrate hydrate. Curing at 200°C and high temperature pyrolysis at 1600°C was used to achieve the crystallization of precursor, forming the SiC-Al coating on the surface of SiC powders. A core-shell structure with the core of SiC and the shell of Cu was constructed by calcination and hydrogen-reduction of Cu nitrate hydrate. XRD and SEM analysis revealed that the β-SiC and 4H-SiC phases were formed on the surface of the initial α-SiC powders. Also, it was observed by EDX mapping that core powders of SiC were homogeneously surrounded with the fine Cu particles on their surface.

Open access

R. Kisiel, M. Guziewicz, K. Golaszewska, M. Sochacki and W. Paszkowicz

Abstract

A mechanism of carriers transport through metal-semiconductor interface created by nickel or titanium-based ohmic contacts on Si-face n-type 4H-SiC is presented herein. The mechanism was observed within the temperature range of 20 °C ÷ 300 °C which are typical for devices operating at high current density and at poor cooling conditions. It was found that carriers transport depends strongly on concentration of dopants in the epitaxial layer. The carriers transport has thermionic emission nature for low dopant concentration of 5×1016 cm−3. The thermionic emission was identified for moderate dopant concentration of 5×1017 cm−3 at temperatures higher than 200 °C. Below 200 °C, the field emission dominates (for the same doping level of 5×1017 cm−3). High dopant concentration of 5×1018 cm−3 leads to almost pure field emission transport within the whole investigated temperature range.

Open access

B. Leszczynska-Madej

Attempts have been made to describe the influence of sintering temperature on the microstructure and properties of Al - SiC composites. Mixtures of 100%Al and Al - 5% SiC, Al - 10% SiC were produced by tumbling for 30 minutes in the Turbula T2F mixer. The powders were subsequently cold pressed at pressure 300MPa in a rigid die on a single action press. The green compacts were sintered in nitrogen at 580°C and 620°C for one hour. The main objective of this work was to determine influence of chemical composition and the manufacturing parameters on microstructure and properties of Al - SiC composites produced by powder metallurgy technology.

Open access

A. Najder, M. Nowak, M. Bigaj, J. Zelechowski, M. Opyrchał and M. Karas

Abstract

In this study, Ni-SiC composite coatings were electroplated on the 5xxx series aluminium alloy substrate. The effect of the quantity (25g/l i 50g/l) and the size (3μm, 0,41μm and 50nm) of SiC particles introduced into the bath as a dispersed phase on properties of the coatings was tested. The influence of these parameters on thickness, microhardness, surface structure, abrasion resistance and corrosion resistance of nickel composite coatings was determined.

Open access

M. Suśniak, J. Karwan-Baczewska, J. Dutkiewicz, M. Actis Grande and M. Rosso

Abstract

The present work investigates the possibility of using powder metallurgy processing for producing a metal matrix composite. Materials were prepared from AlSi5Cu2 chips with reinforcement of 10, 15, 20 wt. % silicon carbide. Aluminum alloy chips were milled with SiC powder in a high-energy ball mill by 40 hours. Mechanical alloying process lead to obtain an uniform distribution of hard SiC particles in the metallic matrix and refine the grain size. The consolidation of composite powders was performed by vacuum hot pressing at 450°C, under pressure of 600 MPa by 10 min. The results shows that the addition of SiC particles has a substantial influence on the microstructure and mechanical properties of composite powder as well as consolidated material. Hot pressing is an effective consolidation method which leads to obtain dense AlSi5Cu2/SiC composite with homogeneous structure and advanced mechanical properties.