Metal treatment – Stock – Containing over 50 per cent metal – but no base metal
Patent
1982-09-30
1984-08-07
Skiff, Peter K.
Metal treatment
Stock
Containing over 50 per cent metal, but no base metal
420464, 420483, 420587, C22C 904, C22C 3002
Patent
active
044642130
ABSTRACT:
The retention of the beta brass phase structure (body-centered cubic) as gold atoms (molars) are substituted for copper atoms. Thus essentially the useful physical and working properties of the beta brasses are retained (hot forgeability, castability, some ductility etc.). As to chemical behavior, there is a definite nobleization effect of the beta brasses, i.e. all gold-containing beta golds are more tarnish resistant than the beta brasses, and the nobleization increases with gold content. However, of most importance from a commercial point of view, is that the low kt beta golds (4-kt, 6-kt) are more tarnish resistant than the 10-kt conventional jewelry alloys, and equal to those of 14-kt gold. In essence there is a tarnish resistance enhancement in going from alpha structure to beta structure kt for kt, in the jewelry range. Other noble metals (Pd, Pt, Ru, Rh, Os, Ir and Ag) may be used singly or in combinations with, or in lieu of, the gold.
REFERENCES:
patent: 1580444 (1926-04-01), Shields
patent: 2200050 (1940-05-01), Auwarter
patent: 2248100 (1941-07-01), Loebich
Alloys Index, "Cu-48Zn-15 Au", vol. 8, 1981, published by Metals Information, Metals Park, Ohio 1982, p. E-244.
Berry E. Janet
Skiff Peter K.
LandOfFree
Nobleization of beta brass does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Nobleization of beta brass, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Nobleization of beta brass will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-602530