Wetting behaviour of SiC ceramics: Part I. E2O3/Al2O3 additive system |
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| Affiliation: | 1. Institute of Physics, National Academy of Sciences of Belarus, 68 Nezavisimosti Avenue, 220072 Minsk, Belarus;2. Scientific-Practical Materials Research Center, National Academy of Sciences of Belarus, 19 Brovka Street, 220072 Minsk, Belarus;1. Belgian Nuclear Research Centre (SCK·CEN), Boeretang 200, B-2400 Mol, Belgium;2. Department of Flow, Heat and Combustion Mechanics, Ghent University (UGent), St.-Pietersnieuwstraat 41, B-9000 Gent, Belgium;3. CERN, 1211 Geneva 23, Switzerland;4. TRIUMF, 4004 Wesbrook Mall, Vancouver, B.C., Canada V6T 2A3;1. Department of Materials Science and Metallurgical Engineering, Engineering Faculty, Ferdowsi University of Mashhad, Mashhad, Iran;2. Department of Industrial Engineering, Engineering Faculty, Quchan University of Technology, Quchan, Iran;1. Imec, Kapeldreef 75, B-3001 Leuven, Belgium;2. KU Leuven, Department of Chemistry, Division of Molecular Imaging and Photonics, Celestijnenlaan 200F, 3001 Heverlee, Belgium;3. Department of Solid State Sciences, CoCooN, Ghent University, Krijgslaan 281 (S1), Ghent 9000, Belgium;1. Maria Curie-Skłodowska University, Institute of Physics, Department of Nuclear Methods, Pl. M. Curie-Skłodowskiej 1, 20-031 Lublin, Poland;2. Maria Curie-Skłodowska University, Faculty of Chemistry, Department of Adsorption, Pl. M. Curie-Skłodowskiej 3, 20-031 Lublin, Poland |
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| Abstract: | Wettability is the most important phenomenon in SiC liquid phase sintering. This paper discusses the ceramic–ceramic wetting of E2O3/Al2O3 additives on SiC, where E2O3 is a mixture of rare earth oxide. A sphere-shaped sample of additive was put on a SiC plate and the set placed in a graphite resistance furnace and heated to the additive sphere melting point at a rate of 10 °C/min. The behaviour of the additive on the SiC plate was observed by means of an imaging system using a CCD camera, while the contact angle was measured and analyzed using QWin Leica software. The tests were performed in argon or nitrogen atmospheres. The wettability curves displayed a fast decline and good spreading. The E2O3/Al2O3 system, which approached a eutectic composition when compared with the phase diagram of the Y2O3/Al2O3 system, displayed better spreading. Measurements of the contact angle could not be made when the test was conducted in a nitrogen atmosphere because of the bubbles that formed in the liquid during the test, damaging the interfacial zone between E2O3/Al2O3 and SiC. The results of these tests indicate that the best sintering atmosphere for this additive system is argon. |
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