苦土橄欖岩の電融並びに電融体の組織と性質に及ぼすチタニア添加の影響 : 苦土橄欖岩電融体の組織と性質に関する基礎的研究(第8報)

概要

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The structure and its change by reheating of the mass obtained by melting the batch prepared by adding titania to dunite in an electric arc furnace under reducing condition were investigated. Also the properties under load at high temperatures were observed.Titania was confirmed to enter into the reaction with iron oxide and magnesia of dunite forming, in the first place, the compounds, (Mg, Fe) O⋅TiO2-n, and then, with the increasing amount, remain as brookite or as the lower oxides of titanium. Coexisting with forsterite these compounds gave a dense and compact ingots, although they partly volatirized and mingled in the substances scattered during the electromelting.The thermal analysis showed the distinguished peaks at 500°-600° and at around 800°C. Furthermore, a profound weight increase was confirmed between 400° and 800°C.The properties under load at high temperatures were good in reducing atmosphere, but the reheating in air lowered the quality owing to the formation of low melting substances in the structure of ingot.
社団法人日本セラミックス協会の論文
1961-08-01