貫入粘度測定法における装置定数と貫入速度

概要

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The penetration method is most favorable for the measurement of non-oxide glass viscosity from 107 to 1013 poise. The principle of this method consists of measurement of the rate of penetration of a cylindrical indenter rod under a known load into the glass specimen maintained at a constant temperature. The indenter rods used were nickel cylinders of 0.5, 1.0 and 2.0mm in diameter. Cylindrical specimens (NBS 710 glass) were 4.0, 5.0 and 6.0mm in diameter and were 6.0mm thick. To obtain absolute viscosity values, the apparatus constant must be experimentally determined, for the rate of penetration is not directly related to that of shear. The author proposes, however, that the apparatus constant is equal to 2/3πγ, where γ is the radius of the cylindrical rod. Consequently the viscosity of glass, η, can be calculated by the following equation, η=2P/3πγV0, where P is the applied load and V0 the penetration rate. This penetration rate depended on the rod diameter irrespective of sample diameter, and if the sample thickness was not extremely thin, that rate was constant irrespective of thickness.
社団法人日本セラミックス協会の論文
1974-09-01