Reaction sintering of AlN–AlON composites |
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| Affiliation: | 1. Materials and Energy Research Center, PO Box 14155-4777, Tehran, Iran;2. Institute of Non Metallic Materials, Technical University Clausthal, Clausthal-Zellerfeld, Germany;1. Instituto de Aeronáutica e Espaço (IAE), Pça Marechal do Ar Eduardo Gomes 50, Vl. das Acácias, CEP: 12228-904 São José dos Campos, Brazil;2. Instituto de Pesquisas Energéticas e Nucleares (IPEN), Av. Lineu Prestes 2242, Cidade Universitária, CEP: 05508-000 São Paulo, Brazil;1. The State key Laboratory, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;2. Graduate University of the Chinese Academy of Science, Beijing 100049, China;3. University of Central Florida, College of Optics and Photonics, Orland, FL, United States;1. Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China;2. University of Chinese Academy of Sciences, Beijing 100039, PR China;1. School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang, 330063 China;2. School of Science, Tianjin Polytechnic University, Tianjin, 300160 China |
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| Abstract: | Sintering behavior of three different compositions in the AlN–Al2O3 system using Y2O3 as a sintering aid was investigated. Samples with various ratios of AlN/Al2O3 were sintered in nitrogen atmosphere using a gas pressure furnace in the temperature range 1750–1950 °C. The densification of the samples was studied by shrinkage and relative density measurements. Results showed that samples containing 1 and 70 wt.% alumina were sintered to near theoretical density at 1800 °C; whereas the sample with 20 wt.% alumina never reached densities higher than 93% in the temperature range considered. It was found that the AlN/Al2O3 ratio and the sintering temperature had a great influence on the microstructure and crystalline phases present in the samples, namely, AlN, γ-AlON, 27R, and YAG. In the sample with 20 wt.% alumina, porosity formation prevented further densification. These porosities were probably due to the release of oxygen during sintering. |
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