Densification behavior,microstructure, mechanical and optical properties of Mg-doped sialon with fluoride additives |
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| Affiliation: | 1. School of Materials Science and Engineering, Anhui University of Science and Technology, Huainan, Anhui 232001, China;2. State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China;3. Tianjin Key Laboratory of Thin Film and Opitcs, Tianjin Jinhang Institute of Technical Physics, Tianjin 300192, China;1. Center for Advanced Research of Energy and Materials, Hokkaido University, Kita 13 Nishi 8, Kitaku, Sapporo 060-8628, Japan;2. Combustion Synthesis Co., Ltd., Numazu, Shizuoka 410-0801, Japan;1. Mechanical Engineering Department, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia;2. College of Aeronautical Engineering, National University of Science & Technology (NUST), Pakistan;3. Center of Excellence in Nanotechnology, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia;4. Materials and Surface Science Institute, University of Limerick, Limerick, Ireland;1. Callaghan Innovation, Lower Hutt, New Zealand;2. MacDiarmid Institute for Advanced Materials and Nanotechnology, Wellington, New Zealand;3. Physics Department, Warwick University, Coventry CV47AL, UK |
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| Abstract: | Mg-doped sialon ceramics with the composition of M0.4Si10.2Al1.8O1N15 were fully densified by hot pressing at 1850 °C for 1 h, using 0.5 wt.% MgF2 or CaF2 as a sintering additive. Densification behavior, phase assemblage, microstructure, and mechanical and optical properties were investigated in detail. The addition of fluorides, especially MgF2, not only resulted in more high-temperature liquid by promoting the dissolution of more N and other constituents but also reduced the viscosity of liquid due to the terminal effect of fluorine. Consequently, the densification was effectively improved. Additionally, the fluoride addition facilitated the formation of a small amount of β-sialon. Both the samples possessed high hardness (∼20 GPa) and fracture toughness (∼4.2 MPa m1/2). The CaF2-added sample exhibited higher infrared transmittance than its counterpart due to less residual glass phase. The present work implies that fluorides are also very effective sintering additives for densifying α-sialon. |
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| Keywords: | Sialon Densification Microstructure Mechanical properties Optical properties |
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