雲母合成用坩堝の研究(第2報)(合成雲母に關する研究第XX報) : Al_2O_3-MgO-SiO_2系素地の燒成及び耐蝕試驗
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概要
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Test pieces of the compositions corresponding to several points of the Mgp-Al_2O_3-SiO_2 system were prepared and tested for corrosion on the phlogopite melt. The compositions of the test pieces are as follows: [table] Test pieces were moulded by the extrusion method and heated to 1600〜1800℃ in a cryptol furnace. They were dipped in the synthetic phlogopite melt and maintained at 1400℃ for 5 hours. When the specimens were cooled, they were observed with unaided eye and under a petrographic microscope. Specimens of SF composition were composed of granu lar spinel crystals and poikilitic forsterite crystals. They were attacked by the melt, when their degrees of water absorption were greater than 2〜3%. But spinel crystals suffered any change and separated into the melt. Specimens of SP composition were composed of granular crystals of spinel and periclase and poifcilitic forsterite crystals. They were not attacked appreciably even when the degree of wa,ter absorption was 8%. Periclase crystals reacted with the melt to separate forsterite needles, i.e. the melt near the crucible wall was saturated with forsterite, so the forsterite crystals of the wall were attacked no more. Specimens of CM composition were composed of corundum crystals with a small amount of glassy matter. Corundum reacted with the melt 【to separate spinel crystals. A dense layer of the precipitated spinel crystals was found along tbe Wall,of the specimens. The degree of water absorption of the specimen should be smaller than 1〜2% to stand for the melt corrosion. Specimens of EP composition were composed of a large amouftt of granular crystals of forsterite and a little amount of granular crystals of periclase. The matrix of the specimen was attacked very easily. The forsterite crystals became separately and dispersed into the melt finally. Periclase was solved in the melt and forsterite crystals grew larger. The degree of water absorption of the specimen should, be less than 4〜5% to stand for the melt.
- 社団法人日本セラミックス協会の論文
- 1949-09-01
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関連論文
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