Kim, MK Park, JK Lee, HW Kang, SH 2024-01-21T04:06:41Z 2024-01-21T04:06:41Z 2021-09-02 2005-11-05 0921-5093 https://pubs.kist.re.kr/handle/201004/135987 The presence of coarse Si particles contributes a hindrance to achieving fully reacted Si3N4 by a reaction-bonded silicon nitride (RBSN) technique for use it) real net-shape parts, such as turbo-charger rotors. A new process is described, in which the nitridation rate is enhanced by cyclic heating and the cyclic and isothermal heating processes were compared. When the nitridation was conducted at various temperatures and times (1370-1420 degrees C for times up to 60h), the reaction rate of the cyclic process was three times faster than that of the isothermal reaction. This can be attributed to the cracking of the reacted Si3N4 shell during nitridation, which exposes unreacted liquid Si in the core. Cracking was found to occur by the internal stress resulting from the volume mismatch between Si3N4 and liquid Si. (c) 2005 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE SA BONDED SILICON-NITRIDE COMPACTS MICROSTRUCTURE MECHANISM HYDROGEN MODEL A cyclic process for the nitridation of Si powder Article 10.1016/j.msea.2005.08.061 1 MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, v.408, no.1-2, pp.85 - 91 MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 408 1-2 85 91 scie scopus 000233524700012 2-s2.0-27944438803 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering Science & Technology - Other Topics Materials Science Metallurgy & Metallurgical Engineering Article BONDED SILICON-NITRIDE COMPACTS MICROSTRUCTURE MECHANISM HYDROGEN MODEL Si3N4 cyclic reaction internal stress stress intensity factor