無機質結合剤を添加した黒鉛坩堝材質の研究 : 黒鉛坩堝の製造に関する研究(第1報)

概要

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In the present paper studies were carried out on fluxing materials for the graphite crucible. At first, by the practical service test for the foundry, it was observed that the quality of graphite crucibles was greatly affected by fluxing materials, and borosilicate glass with a little amount of cryolite had excellent effects as a fluxing material.In order to confirm these results, a lot of test rods of various compositions were prepared, and their physical properties, i.e. bulk density, water absorption, hardness, electrical resistivity, bending and compressive strength were measured.The properties of test pieces were affected by fluxing materials and firing temperature. The piece with borosilicate glass and a little amount of cryolite showed very satisfactory characteristics, especially for water absorption, bending and compressive strength, and these physical properties improved with the rise of firing temperature. The tendency was most remarkable between 1100°C-1200°C.As for the oxidation test, the quality was also affected by fluxing materials. The weight change was the smallest for the piece with borosilicate glass and a little amount of cryolite, and this was made remarkable with the rise of temperature and also with the time of oxidation.These experimental results based on the test pieces showed coincidence with those of the practical service test for the foundry.
社団法人日本セラミックス協会の論文
1964-06-01