DEVELOPMENT OF AN IMPROVED MANUFACTURING PROCESS FOR THE HOT EXTRUSION OF ALLOY STEEL STRUCTURAL SHAPES.
Final technical rept. 1 Mar 65-28 Feb 67,
WHITTAKER CORP WEST CONCORD MA NUCLEAR METALS DIV
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The effect of high pressures on the viscosity of glass extrusion lubricants was investigated as a potential aid in the selection of optimum glass compositions for extrusion. The falling ball method of viscosity determination was successfully adapted to the determination of the viscosity of glasses at temperatures up to 2200 F and pressures up to 180,000 psi. The adaptation developed is based on the use of a ball containing a radioactive cobalt-60 source, thus enabling the descent of the ball through the hot, pressurized glass to be monitored with radiation detectors positioned outside the pressure vessel. Viscosity determinations for three glasses of diverse composition show that pressures of the magnitude encountered in the extrusion of steel have no significant effect on the viscosity of glasses. Selection of glasses for use as extrusion lubricants can therefore be confidently based on readily available viscosity data obtained for these glasses at atmospheric pressure. Author
- Ceramics, Refractories and Glass