ガラスの粘度測定用貫入式粘度計

概要

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An apparatus was constructed for determining the viscosities of small flat pieces of glass from the rate of penetration of a cylindrical indenter. A diagrammatic sketch of the apparatus is given in Fig. 1. The essential parts of the apparatus are ; (1) A cylindrical indenter, (2) A device to supply the load to the indenter, (3) An optical system to magnify the penetration distance of the indenter into the glass, (4) An electric furnace to provide a suitable constant temperature enclosure. Using the NBS 710 glass the relation between the rate of penetration and viscosity of glass was determined with this viscometer. This relation is given by a formula of the type Wt/η=AP^2+BP in which P: penetration depth,η: viscosity of glass, W: supplied load, t: time and A, B: constants. This method is adapted to the measurement of the viscosityηin the range of 10^4〜10^12 poises with experimental accuracy of about Δlogη=±0.1 And then the viscosity of some chalcogenide glasses was measured in the range of 10^6〜10^11 poises.
1966-08-15