METHOD FOR HARDENING PLATINUM OR PLATINUM ALLOY AND METHOD FOR HARDENING PALLADIUM OR PALLADIUM ALLOY

PURPOSE: To impart high hardness to the surface of Pt or Pt alloy without roughening the surface. CONSTITUTION: A mixture of 40% B4 C with 20% borax (Na2 B4 O7 ) is prepd., 20% NaCl and 20% KCl are added to the mixture and they are mixed in a crucible. Platinum of 99.95% purity cast into a hexagonal...

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Bibliographische Detailangaben
Hauptverfasser:	NAKAMORI TOSHIE, SHINONAGA KATSUYA
Format:	Patent
Sprache:	eng
Schlagworte:	BRACELETS CHEMICAL SURFACE TREATMENT CHEMISTRY 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 COINS DIFFUSION TREATMENT OF METALLIC MATERIAL HABERDASHERY HUMAN NECESSITIES INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL JEWELLERY METALLURGY OTHER PERSONAL ADORNMENTS SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION
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Beschreibung
Zusammenfassung:	PURPOSE: To impart high hardness to the surface of Pt or Pt alloy without roughening the surface. CONSTITUTION: A mixture of 40% B4 C with 20% borax (Na2 B4 O7 ) is prepd., 20% NaCl and 20% KCl are added to the mixture and they are mixed in a crucible. Platinum of 99.95% purity cast into a hexagonal-round ring is put in the resultant mixture and heated at 800 deg.C for 4hr in an electric furnace. Boron in the mixture penetrates into the surface of the Pt ring to harden the surface. The Vickers hardness Hv of the surface of the Pt ring is 350. The surface of the hardened ring is hardly roughened and is comparable to the surface of an unhardened Pt ring.