The effect of alumina-based sintering aid on the microstructure,selected mechanical properties,and coefficient of friction of Cf/SiC composite prepared via spark plasma sintering (SPS) method |
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| Affiliation: | 1. Department of Materials Engineering, Malek Ashtar University of Technology, Iran;2. Chemical Engineering and Petroleum Industries Department, Al-Mustaqbal University College, Babylon, 51001, Iraq;1. Institute of Silicate Chemistry of the Russian Academy of Sciences ISC RAS, Makarova Emb. 2, Saint Petersburg, 199034, Russia;2. Institute of Earth Sciences, Saint Petersburg State University, Universitetskaya Emb. 7/9, Saint Petersburg, 199034, Russia;3. Chemistry Department, Moscow State University, Leninskie Gory 1-3, Moscow, 119991, Russia;1. Institute of Solid State Chemistry UB RAS, 620041, 91, Pervomayskaya St., Yekaterinburg, Russia;2. Institute of Natural Science and Mathematics, Ural Federal University, 620000, 51 Lenin Av., Yekaterinburg, Russia;3. Laboratory of Hydrogen Energy, Ural Federal University, 620002, 19 Mira St., Yekaterinburg, Russia;1. Department of Physics, Deenbandhu Chhotu Ram University of Science and Technology, Murthal, Haryana, India;2. Department of Physics, Guru Jambheshwar University of Science and Technology, Hisar, Haryana, India;1. Mössbauer Research Group, Department of Physics, S.B. College, Changanassery, Kerala, 686101, India;2. Mahatma Gandhi University, Kottayam, Kerala, 686560, India;3. Smart Materials Section, Materials Characterization Group, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu, 603102, India;4. Homi Bhabha National Institute, Training School Complex, Anushaktinagar, Mumbai, 400094, India;1. School of Materials Science and Engineering, Harbin Institute of Technology Weihai, Weihai, 264205, China;2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150006, China;1. Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, PL–30239, Krakow, Poland;2. Department of Inorganic Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Ilkovicova 6, Mlynska Dolina, 842 15, Bratislava, Slovakia;3. Institute of Applied Electrodynamics and Telecommunications, Faculty of Physics, Vilnius University, Sauletekio al. 9/3, 10222, Vilnius, Lithuania;4. AGH University of Science and Technology, Faculty of Material Science and Ceramics, Mickiewicza 30, Krakow, Poland;5. Department of Experimental Physics, Faculty of Mathematics, Physics, and Informatics, Comenius University Bratislava, 842 48, Bratislava, Slovakia |
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| Abstract: | Cf-SiC air brake discs are being developed due to their high-temperature oxidation resistance compared to conventional Cf/C discs. The Cf-SiC air brake discs should have a coefficient of friction (COF) close to 0.4, a low wear rate, a density higher than 95% of the theoretical density, and flexural strength of more than 200 MPa. To reach the properties of Cf-SiC composite to the required characteristics of the air brake disc, different amounts of alumina-based sintering aid were used. For this purpose, first silicon carbide nanoparticles, sintering aids Al2O3–MgO, MgAl2O4, Al2O3–Y2O3, Al2O3–SiO2–MgO, and carbon fiber (20 wt%) with a 5-mm length were prepared. Next, the final composite bulk was created via the SPS method at 1900 °C under a pressure of 50 MPa. The density of the sample sintered with the Al2O3–SiO2–MgO sintering aid was higher than that of other sintering aids. The density value was obtained at 98% and 100% at 8 wt% and 4 wt% respectively. It was also found that the use of 4 wt% of Al2O3–SiO2–MgO offered better mechanical properties compared to 8 wt%, due to the absence of Al8Si4O20 phase at 4 wt%. The examination of mechanical properties showed that the hardness (3564 Vickers) and flexural strength (479 MPa) of the sample with the Al2O3–SiO2–MgO sintering aid were higher than those of other sintering aids. The samples with the Al2O3–SiO2–MgO sintering aid with 4 wt% revealed a COF of 0.41, showing the closest feature to the desired indices of aircraft brake discs. |
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| Keywords: | Sintering aid Composite Flexural strength Porosity |
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