Sinterings of polytetrafluoroethylene loaded with titanium and the preparation thereof
Abstract
Abstract DESCRIBED ARE SINTERINGS OF POLYTETRAFLUOROETHYLENE LOADED WITH TITANIUM AND THE PREPARATION THEREOF. SAID SINTERINGS ARE USEFUL FOR THE CONSTRUCTION OF MECHANICAL ELEMENTS HAVING HIGH ANTICORROSIVE CHARACTERISTICS COUPLED WITH MECHANICAL PROPERTIES SUPERIOR TO THOSE OF THE NONIMPREGNATED POLYTETRAFLUOROETHYLENE SINTERINGS. ALSO DESCRIBED IS THE PREPARATION OF SINTERINGS OF POLYTETRAFLUOROETHYLENE RESINS LOADED WITH TITANIUM. THIS PROCESS IS CHARACTERIZED BY THE FOLLOWING STEPS: PRELIMINARY MIXING OF THE POLYTETRAFLUOROETHYLENE RESIN POWDER, HAVING A GRANULOMETRIC SIZE OF BETWEEN 0.25U AND 60U AND METALLIC TITANIUM MICROPOWDER WITH A GRANULOMETRIC SIZE BETWEEN 40U AND 200U IN A RATIO VARYING FROM 10-50% BY WEIGHT OF TITANIUM WITH RESPECT TO THE MIXTURE. PREFORMING THE MIXTURE WITH A VOLUME REDUCTION OF ABOUT 4:1, BY COMPRESSION IN SUITABLE MOLDS AT A PRESSURE COMPRISED BETWEEN 4000 AND 6000 KG./CM.**2. SINTERING THE COMPACTED MIXTURE BY SLOWLY HEATING IN AN OVEN, TO A TEMPERATURE BETWEEN 300* AND 450* C. FOR FROM 1 TO 3 HOURS. AND GRADUALLY COOLING DOWN THE SINTERING TO ROOM TEMPERATURE IN ORDER TO AVOID DEFORMATIONS AND CRACKS.
Inventors
- 👤 Guiseppe Zuliani
- 👤 Miniato Socci
Bibliographic Details
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