Effect of Al2O3 and Fe3Al on the phase formation and mechanical properties of β-sialon |
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| Affiliation: | 1. Key Laboratory of Tropical Medicinal Plant Chemistry of Ministry of Education, Hainan Normal University, Haikou 571158, PR China;2. College of Pharmacy, Fujian University of Traditional Chinese Medicine, Fuzhou 350122, PR China;1. Belgian Ceramic Research Centre (Member of EMRA), Avenue Gouverneur Cornez 4, Mons, B-7000 Belgium;2. MTM KULeuven, Kasteelpark Arenberg 44, Leuven, B-3001 Belgium;3. EMPA UCLouvain, Place Sainte Barbe 2, Louvain-la-Neuve, B-1348 Belgium;1. Dept. of Mechanical Engineering, IET Bhaddal Ropar, Punjab, India;2. Dept. of Production Engineering, G.N.D.E.C. Ludhiana, Punjab,india;3. Dept. of Mechanical Engineering S.V.I.E.T Banur, Punjab, India;4. School of Mechanical Engineering LPU Phagwara, Punjab,India;5. Dept. of Mechanical Engineering, S.B.S.S.T.C. Ferozepur, Punjab,india;1. Department of Mechanical Engineering, College of Electrical and Mechanical Engineering (CE&ME), National University of Sciences and Technology (NUST), Pakistan;2. Department of Mechanical and Nuclear Engineering, University of Sharjah, Sharjah, United Arab Emirates;3. Center of Excellence in Nanotechnology, King Fahd University of Petroleum and Minerals (KFUPM), Saudi Arabia;4. Department of Mechanical Engineering, King Fahd University of Petroleum and Minerals (KFUPM), Saudi Arabia |
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| Abstract: | The paper evaluated the mechanical properties of β-sialon composites prepared by hot-pressing sintering at 1600 °C in N2 atmosphere using α-Si3N4, Al2O3, Y2O3 and Fe3Al as raw materials. The influence of Al2O3 and Fe3Al content on flexure strength, fracture toughness, hardness, and relative density was investigated. And phase formation and morphology of the composites were characterized by X-ray diffraction and electron microscopy. The experimental results indicate that the raw material Fe3Al reacts with α-Si3N4 to form silicides at elevated temperature, and supplies more liquid phase to assist densification. Besides, the variation of flexure strength, fracture toughness and hardness is mainly consistent, and also in good agreement with the relative density measurements. The values all increase firstly, and then decrease when the Al2O3 content increases. Scanning electron microscopy illustrates that the metal particles act to inhibit the crack propagation. |
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