TEMPERATURE FIELDS AND STRESS STATE OF REACTORS USED FOR HIGH-TEMPERATURE SYNTHESIS

摘要

A procedure for the production of rare nonmetallic compounds using high-temperature synthesis was developed by the Institute of Structural Macrokinetics of the Russian Academy of Sciences (ISMAS, Chernogolovka). Detail designs of reactors for self-propagating high-temperature synthesis (SHS) have been drafted at the IrkutskNiIkhimmash. Development of a detail design was complicated by the fact that during the SHS reaction (approximately 8 min), the temperature of the charge is raised to 4000℃, and then drops-off sharply. The SHS reactor is a high-pressure vessel, whose ends are sealed by two flat covers with quick-release bolts. To protect the steel housing from high-temperature effects, a graphite lining is called for inside the vessel, and an air gap exists between the lining and housing. To assess the strength and serviceability of the reactors, it was necessary, above all, to define the nonstationary temperature field that develops in the vessel during an SHS reaction.