イリジウム金属の気化に及ぼす温度、風速および酸素濃度の影響

概要

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Currently, materials which can be used for engine components and test instruments in high temperature conditions are highly wanted since R & D works of high speed flight vehicles and high efficiency engines with high cycle temperature are in progress. Iridium is one of the promising materials with melting temperature over 2400℃. However, the evaporation rate of the material in oxidizing gases was hardly known quantitatively, especially in combustion gases. Evaporation rate of lridium metal has been measured here in combustion gas stream varying its temperature, stream velocity and oxygen concentration. Each lridium ring test piece with about one mm thick in diameter was exposed in a modulated combustion gas with varied oxygen concentration and temperature. The evaporation rate, or mass evaporated per unit surface area, is determined by weighing the test piece before and after the exposure. The dependency on the effective parameters is summarized into an equation, which can be used for estimation of the lridium evaporation in practical use.
社団法人日本ガスタービン学会の論文
1998-03-10