US2010226815A1PendingUtilityA1

Lead-Free Brass Alloy

41
Individually held — no corporate assignee on recordPriority: Mar 9, 2009Filed: Mar 9, 2009Published: Sep 9, 2010
Est. expiryMar 9, 2029(~2.6 yrs left)· nominal 20-yr term from priority
Inventors:Norman M. Lazarus
C22C 9/04
41
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Claims

Abstract

The invention relates to brass alloys that are substantially lead-free. In the alloys of the invention, lead is replaced with tellurium resulting in alloys that exhibit excellent machinability and conductivity.

Claims

exact text as granted — not AI-modified
1 . A brass alloy comprising:
 Copper;   Zinc;   Tellurium; and   Lead   wherein lead comprises less than 0.25% of the alloy and the tellurium comprises from about 0.025% to about 1% of the alloy, and   wherein the alloy has a tensile strength of from about 240 MPa to about 530 MPa, and   wherein the alloy is silicon free.   
   
   
       2 . The alloy of  claim 1  wherein the copper comprises from about 57% to about 98% of the alloy. 
   
   
       3 . The alloy of  claim 1  wherein the zinc comprises from about 2.0% to about 43% of the alloy. 
   
   
       4 . The alloy of  claim 1  further comprising less than about 0.02% phosphorous. 
   
   
       5 . A brass alloy comprising:
 about 57% to about 98% copper;   about 2% to about 43% zinc; and   about 0.025% to about 1.0% tellurium   wherein the alloy has a tensile strength of from about 240 MPa to about 530 MPa, and   wherein the alloy is silicon free.   
   
   
       6 . The alloy of  claim 5  further comprising less than about 0.025% lead. 
   
   
       7 . (canceled) 
   
   
       8 . The alloy of  claim 1  having a yield strength of from about 200 MPa to about 450 MPa. 
   
   
       9 . The alloy of  claim 1  having a conductivity of from about 28% to about 49% IACS. 
   
   
       10 . The alloy of  claim 1  wherein the zinc comprises about 5% of the alloy. 
   
   
       11 . The alloy of  claim 1  wherein the zinc comprises about 10% of the alloy. 
   
   
       12 . The alloy of  claim 1  wherein the zinc comprises about 15% of the alloy. 
   
   
       13 . The alloy of  claim 1  when the zinc comprises about 40% of the alloy. 
   
   
       14 . (canceled) 
   
   
       15 . The alloy of  claim 5  having a lead content of less than about 0.5%. 
   
   
       16 . The alloy of  claim 5  having a lead content of less than about 0.01%. 
   
   
       17 . The alloy of  claim 5  having a tensile strength of from about 240 MPa to about 530 MPa. 
   
   
       18 . The alloy of  claim 5  having a yield strength of from about 200 MPa to about 450 MPa. 
   
   
       19 . The alloy of  claim 5  having a conductivity of from about 28% to about 49% IACS.

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