Method of cleaning metal components for cathode ray tubes

Metal components for cathode ray tubes have up till now been degreased by washing with halogenated hydrocarbons. These degreasing agents pollute the environment, The new method is ecologically sound and the metal components are cleaned so thoroughly that they may be used for high vacuum applications...

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Bibliographische Detailangaben
Hauptverfasser:	MATEIAS, EMIL
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRIC ELEMENTS CHEMICAL SURFACE TREATMENT CHEMISTRY CLEANING CLEANING IN GENERAL CLEANING OR DEGREASING OF METALLIC MATERIAL BY CHEMICALMETHODS OTHER THAN ELECTROLYSIS COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DIFFUSION TREATMENT OF METALLIC MATERIAL ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS ELECTRICITY INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL METALLURGY PERFORMING OPERATIONS PREVENTION OF FOULING IN GENERAL SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TRANSPORTING
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Beschreibung
Zusammenfassung:	Metal components for cathode ray tubes have up till now been degreased by washing with halogenated hydrocarbons. These degreasing agents pollute the environment, The new method is ecologically sound and the metal components are cleaned so thoroughly that they may be used for high vacuum applications. The metal components (12) to be cleaned are preferably heated in a reducing atmosphere at 500 DEG to 800 DEG C. for 5 to 45 minutes in a continuous furnace (1) which is formed integral with a blackening furnace (2). The method enables a simple, reproducible undangerous and ecologically sound cleaning. After burning the exhaust gases the emissions only consist of carbon dioxide and water.