Method of manufacturing rotationally symmetrical glass bodies
AssigneeU. S. Philips Corporation
InventorRolf Clasen
Life of this patent
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Abstract
A method of manufacturing rotationally symmetrical glass bodies. The starting material for the glass body is a thixotropic suspension consisting of powered glass in a liquid dispersing agent. The suspension is introduced into a hollow mold whose geometry corresponds to that of the glass body to be formed. The hollow mold is rotated about its longitudinal axis to deposit the suspension on the inner wall of the hollow mold. The after which the green body thus formed is purified and sintered. The green body is formed by heating the rotating mold and the suspension therein to a temperature below the boiling point of the dispersing liquid until cross-linking and solidification of the starting material is obtained. Thereafter, the green body can be removed from the hollow mold.
Claims27
A method of manufacturing rotationally symmetric glass bodies, said method comprising the steps of:
- providing a hollow mold having a longitudinal axis and having an inside with an inner wall;
- preparing a first liquid having a density;
- preparing a thixotropic suspension comprising a powdered glass material and a liquid dispersing agent, said liquid dispersing agent having a boiling point, said suspension having a density lower than the density of the first liquid;
- introducing the first liquid into the inside of the mold;
- introducing the suspension into the inside of the mold;
- rotating the mold about its longitudinal axis to deposit the first liquid on the inner wall of the mold to produce an auxiliary layer, and to deposit the suspension on the auxiliary layer;
- heating the suspension to a temperature below the boiling point of the liquid dispersing agent until the suspension cross-links and solidifies;
- removing the solidified suspension from the mold;
- and
- purifying and sintering the solidified suspension.
A method of manufacturing rotationally symmetric glass bodies, said method comprising the steps of:
- providing a hollow mold having a longitudinal axis and having an inside with an inner wall;
- preparing a thixotropic suspension comprising a powdered glass material and a liquid dispersing agent, said liquid dispersing agent having a boiling point;
- introducing the suspension into the inside of the mold;
- rotating the mold about its longitudinal axis to deposit the suspension on the inner wall of the mold;
- heating the suspension to a temperature below the boiling point of the liquid dispersing agent while rotating the mold until the suspension cross-links and solidifies;
- removing the solidified suspension from the mold;
- and
- purifying and sintering the solidified suspension.
A method of manufacturing rotationally symmetric glass bodies, said method comprising the steps of:
- providing a hollow mold having a longitudinal axis and having an inside with an inner wall;
- preparing a thixotropic suspension comprising a powdered glass material and a liquid dispersing agent, said liquid dispersing agent having a boiling point;
- cooling the suspension to a temperature at which cross-linking between powdered glass particles in the suspension proceeds slowly;
- liquefying the suspension;
- introducing the suspension into the inside of the mold;
- rotating the mold about its longitudinal axis to deposit the suspension on the inner wall of the mold;
- and then
- heating the suspension to a temperature below the boiling point of the liquid dispersing agent while rotating the mold until the suspension cross-links and solidifies;
- removing the solidified suspension from the mold;
- and
- purifying and sintering the solidified suspension.
Dependencies are inferred from the claim text.