熔融ガラスによる電極用モリブデンの侵蝕

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Recently electric boosting technique using molybdenum electrode is often applied in glass melting. In this paper, studies on effects of temperature and composition of glasses on corrosion of molybdenum are reported.In the first experiment molybdenum test pieces were immersed in various kinds of molten glasses, namely, borosilicate, aluminosilicate, soda-lime-magnesia, barium or lead glasses for 50 hours at 1400°C, and in the second, effects of refining agents such as As2O3, Na2SO4 and Sb2O3 were examined by 50 hours' soaking at temperatures from 1100° to 1500°C.Visual observation of molybdenum test pieces and glasses after the corrosion test and determination of weight loss of molybdenum showed that;1) Weight loss of molybdenum increased with rising the soak temperature.2) Weight loss of molybdenum increased distinctly with the amount of As2O3 and slightly with Na2SO4, and the effect of Sb2O3 was almost unrecognizable.3) In the corrosion test with lead containing glasses, test pieces were corroded severely and contamination or devitrification of glasses and separation of metallic lead from glasses were observed.4) In the corrosion test with other kinds of glasses, contamination of glasses occured only around test pieces. Effects of major components except PbO were considerably small.5) Corrosion products on the surface of test pieces were MoO3, MoO2+MoO3, Mo+MoO2 or in case of SO3-- containing glasses (reducing condition), MoS2. The authors are of opinion that the corrosion of molybdenum is presumably accelerated by formation and evaporation of MoO3.
社団法人日本セラミックス協会の論文
1964-07-01

熔融ガラスによる電極用モリブデンの侵蝕

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