Wettability and infiltration of Si melt on SiO2-Si3N4 composite ceramic |
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| Affiliation: | 1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science & Technology, Wuhan, 430081, China;2. National-Provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology, Wuhan University of Science & Technology, Wuhan, 430081, China;1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, 430081 Wuhan, PR China;2. National-provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology, Wuhan University of Science and Technology, 430081 Wuhan, PR China;1. DECHEMA-Forschungsinstitut, Theodor-Heuss-Allee 25, 60486 Frankfurt am Main, Germany;2. MTU Aero Engines AG, Dachauer Straße 665, 80995 Muenchen, Germany;1. School of Materials Science and Engineering, Tiangong University, Tianjin 300387, China;2. Tianjin Key Laboratory of Advanced Fibers and Energy Storage, Tianjin 300387, China;1. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China;2. Department of Materials Application, AVIC Manufacturing Technology Research Institute, Beijing, 100024, China |
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| Abstract: | Non-wettable material with Si melt is preferred to manufacture crucible in order to avoid adhesion between Si and traditional fused silica crucible. In this work, wetting and infiltration behaviors of Si drop on porous/dense SiO2-Si3N4 ceramic and SiO2 ceramic were systematically studied via the sessile drop technology and microstructural analysis method. The porous SiO2-Si3N4 ceramic exhibited non-wetting behavior with stable contact angle of about 130 °. Nevertheless, dense SiO2-Si3N4 ceramic and SiO2 ceramic displayed wetting features with Si drop. For both SiO2-Si3N4 ceramics, three kinds of infiltrations were observed, including infiltration under Si drop, infiltration under substrate surface (beyond drop) and infiltration on substrate surface. Notably, the infiltration under Si drop had the slowest speed with tiny infiltration depth. The above non-wetting behavior and tiny infiltration under drop of porous SiO2-Si3N4 ceramic were closely related to material pore characteristics and Si/substrate interfacial reaction. |
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| Keywords: | Wettability Infiltration Sessile drop test Photovoltaic silicon |
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