真珠岩の発泡性に及ぼす加熱雰囲気の影響

概要

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The effects of atmospheres on foaming characteristics and properties of perlite were investigated. The foaming characteristics and properties of perlite were influenced by the thermal conductivity of the heating gas and the presence of oxygen in the heating atmosphere. The release temperature of H_2O in perlite was shifted to the higher temperature region by a rapid heating. In order to accelerate the heating rate of perlite, He gas with a high thermal conductivity was used for a heating atmosphere. It was found that the unit weight of perlite expanded by heating in He gas was smaller than that in a gas with a moderate thermal conductivity such as N_2・ The unit weight of perlite expanded by heating in an oxidizing gas was larger than that in an inert gas. In the case of heating at 900℃ which was near a softening temperature of perlite, the inhibition effect of oxygen on foaming characteristics was observed remarkably. This is because that the softening temperature is increased due to the oxidation of the glass phase.
社団法人日本セラミックス協会の論文
1996-09-01