EP 1877588 A2 20080116 - METHOD FOR ADDING BORON TO METAL ALLOYS
Title (en)
METHOD FOR ADDING BORON TO METAL ALLOYS
Title (de)
VERFAHREN ZUM ZUSATZ VON BOR ZU METALLLEGIERUNGEN
Title (fr)
PROCEDE D'ADJONCTION DE BORE A DES ALLIAGES DE METAUX
Publication
Application
Priority
- US 2006014835 W 20060419
- US 13262105 A 20050519
- US 40518806 A 20060417
- US 67256605 P 20050419
- US 73278405 P 20051102
Abstract (en)
[origin: US2006231171A1] A method to grain refine and deoxidize a precious metal alloy or a master alloy includes the steps of (a) forming a precursor melt consisting essentially of constituents of the precious metal alloy or master alloy and inevitable impurities; (b) dispersing a compound selected from the group consisting of boron containing metal hydrides, boron containing metal fluorides and mixtures thereof throughout the precursor melt; and (c) solidifying the boron containing precious melt alloy or master alloy. One suitable compound is solid sodium borohydride (sodium tetrahydroborate). To minimize evaporation of the boron on contact with the precursor alloy melt, the sodium borohydride may be wrapped in a metal foil formed from constituents of the precious metal alloy or master alloy. The cast precious metal alloy or master alloy has been found to have a reduced number of hard spots and reduced silicon contamination when compared to conventional casting methods.
IPC 8 full level
C22B 9/05 (2006.01); B22D 11/116 (2006.01); C22B 9/10 (2006.01); C22C 1/06 (2006.01); C22C 5/02 (2006.01); C22C 5/04 (2006.01); C22C 5/08 (2006.01)
CPC (source: EP US)
C22B 9/103 (2013.01 - EP US); C22B 9/106 (2013.01 - EP US); C22B 11/02 (2013.01 - EP US); C22C 1/06 (2013.01 - EP US); C22C 5/02 (2013.01 - EP US); C22C 5/08 (2013.01 - EP US); C22C 9/00 (2013.01 - EP US)
Citation (search report)
See references of WO 2006113847A2
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
Designated extension state (EPC)
AL BA HR MK YU
DOCDB simple family (publication)
US 2006231171 A1 20061019; AU 2006236256 A1 20061026; CA 2605502 A1 20061026; EA 200702268 A1 20080428; EP 1877588 A2 20080116; JP 2008538387 A 20081023; MX 2007012881 A 20080212; TW 200641157 A 20061201; WO 2006113847 A2 20061026; WO 2006113847 A3 20070719; WO 2006113847 A8 20071129
DOCDB simple family (application)
US 40518806 A 20060417; AU 2006236256 A 20060419; CA 2605502 A 20060419; EA 200702268 A 20060419; EP 06750787 A 20060419; JP 2008507855 A 20060419; MX 2007012881 A 20060419; TW 95113962 A 20060419; US 2006014835 W 20060419