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(11) | EP 0 734 848 A3 |
(12) | EUROPEAN PATENT APPLICATION |
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(54) | A method for safe transmission of steady or time-dependent pressure under high-low, steady or time-dependent temperature |
(57) The present invention deals with the application and transmission of steady or time
varying pressure under high/low, steady or time dependent temperatures and eliminates
the potential danger for explosive events which is unavoidable in coventional techniques
(with fluid media). The method consists of using an assembly of ceramic microspheres
coated by a solid lubricant (for temperatures between -50°C and 1600°C and steady
or monotonically increasing pressure) or a mixture of melted oxides with extremely
high boiling points (for temperatures between 300° and 2700°C and steady or cyclically
varied pressure). The invention is related to the fields or Mechanics of Materials,
Fluid Mechanics, Technology of Ceramics, etc. The method is exemplified in the case
of internal pressurization of tubular metallic specimens. The tests show uniform pressure
transmission to the desired directions, very good efficiency (ratio of radial to axially
imposed pressure), repeatability and elimination of the explosion danger and the associated
costs. |