Reactive synthesis of alumina-boron nitride composites |
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| Affiliation: | 1. Synergy Ceramics Laboratory, Fine Ceramics Research Association (FCRA), 2268-1, Shimo-Shidami, Moriyama-ku, Nagoya, Aichi 463-8687, Japan;2. Synergy Materials Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Nagoya, Aichi 463-8687, Japan;1. Department of Mechanical Engineering, Rahma Valley College of Engineering & Research Institute, Nashik 422 213, Maharashtra, India;2. Department of Mechanical Engineering, Sri Ramakrishna Institute of Technology, Coimbatore 641010, Tamil Nadu, India;3. Department of Civil Engineering, Vellore Institute of Technology, Vellore 632014, Tamil Nadu, India;4. Department of Mechanical Engineering, University College of Engineering Ramanathapuram Campus, Ramanathapuram-623513, Tamil Nadu, India;5. Associate Professor in Mechanical Engineering, Annamalai University, Annamalai Nagar-608002, Tamil Nadu, India;6. Department of Mechanical Engineering, Gokaraju Rangaraju Institute of Engineering and Technology, Hyderabad 500090, Telangana, India;1. Department of Mechanical Engineering, CMR Institute of Technology, Hyderabad 501401, Telangana, India;2. Department of Mechanical Engineering, Vels Institute of Science, Technology & Advanced Studies, Chennai 600117, Tamil Nadu, India;3. Department of Civil Engineering, CMR Institute of Technology, Hyderabad 501401, Telangana, India;1. School of Mechanical and Building Sciences, VIT University-Chennai, Chennai 600 127, India;2. School of Advanced Sciences, Chemistry Division, VIT University-Chennai, Chennai 600 127, India;1. Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, S-106 91 Stockholm, Sweden;2. State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Shanghai 200050, People’s Republic of China;3. Department of Metallurgy and Materials Engineering (MTM), KU Leuven, B-3001 Heverlee, Belgium;1. Department of Materials Science and Engineering, HEDPS/CAPT/LTCS, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, College of Engineering, Peking University, Beijing 100871, China;2. Department of Electronic Engineering, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China |
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| Abstract: | The reactions of aluminum borates (9Al2O3 · 2B2O3 and 2Al2O3 · B2O3) with aluminum nitride (AlN) have been used as a new chemical route to synthesize alumina-boron nitride (Al2O3–BN) composites. Reaction mechanisms were investigated by TG-DTA and static reaction process. The reactions started at around 1200 °C and completed at around 1500 °C. Soaking at temperatures higher than 1800 °C resulted in the reverse reaction that caused great weight loss. Hot pressing promoted the reactions due to the improved diffusion process. The in situ formed BN phase was in agglomerate shape located at the pockets of Al2O3 matrix particles and this distribution was suggested to be beneficial to the strength of materials with weak phase dispersoids. The fracture surface analysis demonstrated that the main fracture mode was transgranular, indicating the existence of a strong Al2O3 network in the in situ synthesized composites. The prepared composites exhibited high strength, low Young’s modulus and high strain tolerance. |
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