C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
C01B 19/04 (2006.01) C22C 9/04 (2006.01)
Patent
CA 2224679
Machinable lead free brasses for potable water applications are provided wherein a combination of bismuth and selenium are substituted in the alloy for lead and the bismuth and selenium are added to the alloy in the form of an additive product comprising bismuth selenide. A method of making the brasses which meets environmental and safety regulations is also provided. The bismuth selenide is preferably made by sintering particles of bismuth and selenium in a Bi/Se weight ratio of about 1.8 or greater and fusing the sinter.
Cette invention concerne du laiton sans plomb usinable destiné aux installations d'eau potable. Dans cet alliage, on substitue au plomb une combinaison de bismuth et de sélénium, et on ajoute le bismuth et le sélénium sous forme d'un additif renfermant du séléniure de bismuth. Cette invention concerne également un procédé de fabrication de laiton conforme à la règlementation sur l'environnement et la sécurité. On fabrique de préférence le séléniure de bismuth en frittant des particules de bismuth et de sélénium selon un rapport pondéral Bi/Se d'environ 1,8 ou au-delà, puis en portant le frittage à fusion.
King Michael G.
Li Taie
Asarco Incorporated
Ridout & Maybee Llp
LandOfFree
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