Colloidal Filtration of Silicon Nitride Aqueous Slips,Part II: Slip Casting and Pressure Casting Performance |
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| Affiliation: | 1. Instituto de Cerámica y Vidrio, C.S.I.C., Crtra. Valencia Km. 24,300, 28500 Arganda del Rey, Madrid, Spain;2. Italian Ceramic Center, Via Martelli 26, 40138 Bologna, Italy;1. Telethon Kids Institute, University of Western Australia, Perth, Australia;2. Queensland Children''s Medical Research Institute, University of Queensland, Brisbane, Australia;3. Centre for Respiratory Medicine and Allergy, Institute of Inflammation and Repair, University of Manchester and University Hospital of South Manchester, Manchester, United Kingdom;4. Centre for Allergy Research, Karolinska Institute, Stockholm, Sweden;1. Institute of Problems of Chemical Physics, Chernogolovka, Moscow 142432, Russia;2. Physics Faculty and International Laser Center, M.V. Lomonosov Moscow State University, Moscow 119991, Russia;1. Key Lab of RF Circuits and Systems of the Ministry of Education, College of Electronics and Information, Hangzhou Dianzi University, Hangzhou 310018, China;2. Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, Xi’an Jiaotong University, Xi’an 710049, China;1. Department of Electronics and Electrical Engineering, Dankook University, Gyeonggi-do, Yongin 16890, Korea;2. School of Electrical Engineering, Pukyong National University, 45 Yongso-ro, Nam-gu, Busan 48513, Korea;3. Interdisciplinary Program of Biomedical Mechanical & Electrical Engineering, Pukyong National University, 45 Yongso-ro, Nam-gu, Busan 48513, Korea;1. College of Information Engineering, Huangshan University, Huangshan 245041,China;2. Key Laboratory of Radar Imaging and Microwave Photonics, Ministry of Education, College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China |
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| Abstract: | In a previous part, the rheological behaviour of silicon nitride aqueous slips was optimized by dispersing with TMAH up to pH 11·5 using different mixing procedures and including different concentrations of sintering aids (Al2O3 and Y2O3). In this part, the obtention of pressureless sintered silicon nitride bodies by colloidal filtration techniques is studied. The kinetics of the different compositions is studied for both slip casting and pressure casting. The pressure casting kinetics is up to 20 times faster than that of slip casting, which allows the scale-up of the process for a low cost production, The obtained green density is slightly >58%th for slip casting and 57–55%th for pressure casting, depending on the applied pressure. This small difference does not influence sintered density. At 1750°C/2h, a final density around 96%th is obtained. The sintering conditions are studies considering the time, temperature, atmosphere and sintering bed. The best results are obtained when the sintering bed has the same composition to that of the sample to be sintered. The room temperature properties of the sintered materials show a KIC value higher than 6 MPam1/2, comparable to those found in the literature for pressure sintered materials. |
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