シラスの工業的利用に関する研究-18-シラスガラス-マグネシア-ジルコニア系におけるガラス化領域と同系ガラスの二,三の性質

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Shirasu, which is a sort of volcanic ejecta and widely deposited in southernKyushu, consists mainly of volcanic glass (shorten as SVG) with a fixed chemicalcomposition. In this paper, glass-forming regions were examined for the systemSVG-MgO-ZrO_2, furthermore the alkaline durability and crystallization propertywere investigated on the glasses for GRC (Glassfiber Reinforced Concrete).The batches of the system were heated at 1400°C and 1500°C, and quenched intocold water. The compositions of clear or partially crystallized glasses are shown inFig.1 The SVG-MgO-ZrO_2 glass particles (2.5g) were immersed in 2N NaOHsolution (100ml) at 70°C for 24 h. The weight loss of the glass particles decreasedwith an increase in particle size and also in MgO or ZrO_2 content of the glasses(Fig.2). Heat treatment of the glasses at 1200°C for 1 h caused the formation ofmonoclinic zirconia, tetragonal zirconia, zircon, and forsterite crystals. The formation regions of the crystals precipitated from the SVG-MgO-ZrO_2 glasses by heat treatment are shown in Fig.3.
鹿児島大学,カゴシマダイガク,Kagoshima Universityの論文