HIGH IMPACT SOLDER TOUGHNESS ALLOY
A lead-free solder alloy comprising from 35 to 59 wt % Bi; from 0 to 1.0 wt % Ag; from 0.05 to 0.4 wt % Cu; from 0 to 0.5 wt % Co; and the balance Sn, together with any unavoidable impurities.
1 . A lead-free solder alloy, comprising:
from 35 to 59 wt % Bi;
from 0.9 to 1.0 wt % Ag;
from 0.1 to 1.0 wt % Cu;
from 0.01 to 0.07 wt % Co;
and the balance Sn, together with any unavoidable impurities;
wherein the alloy begins to melt at approximately 138° C.
2 . (canceled)
3 . (canceled)
4 . The alloy of claim 1 consisting of:
from 35 to 59 wt % Bi;
from 0.9 to 1.0 wt % Ag;
from 0.1 to 1.0 wt % Cu;
from 0.01 to 0.07 wt % Co;
and the balance Sn, together with any unavoidable impurities;
wherein the alloy begins to melt at approximately 138° C.
5 . The alloy as claimed in claim 4 wherein the Co is present in a concentration between 0.02 and 0.04 wt %.
6 . (canceled)
7 . (canceled)
8 . The alloy as claimed in claim 4 wherein the Co is present in a concentration of 0.03 wt %.
9 . (canceled)
10 . (canceled)
11 . (canceled)
12 . The alloy as claimed in claim 1 further comprising from 0.001 to 1.0 wt % Ge.
13 . The alloy as claimed in claim 1 further comprising from 0.001 to 0.1 wt % Ge.
14 . The alloy as claimed in claim 1 further comprising from 0.001 to 0.01 wt % Ge.
15 . The alloy as claimed in claim 1 consisting of:
from 35 to 59 wt % Bi;
from 0.9 to 1.0 wt % Ag;
from 0.1 to 1.0 wt % Cu;
from 0.01 to 0.07 wt % Co;
from 0.001 to 1.0 wt % Ge; and
the balance Sn together with any unavoidable impurities;
wherein the alloy begins to melt at approximately 138° C.
16 . The alloy as claimed in claim 15 wherein the Bi is present in a concentration between 45 and 50 wt %.
17 . (canceled)
18 . The alloy as claimed in claim 15 wherein the Cu concentration is 1 wt %.
19 . The alloy as claimed in claim 1 wherein the Bi is present in a concentration between 45 and 50 wt %.
20 . (canceled)
21 . The alloy as claimed in claim 1 wherein the Cu concentration is 1 wt %.
22 . The alloy as claimed in claim 1 further comprising from 0.001 to 1.0 wt % Sb.
23 . The alloy as claimed in claim 1 further comprising from 0.003 to 0.7 wt % Sb.
24 . The alloy as claimed in claim 1 further comprising from 0.005 to 0.05 wt % Sb.
25 . The alloy as claimed in claim 1 consisting of:
from 35 to 59 wt % Bi;
from 0.9 to 1.0 wt % Ag;
from 0.1 to 1.0 wt % Cu;
from 0.01 to 0.07 wt % Co;
from 0.001 to 1.0 wt % Sb; and
the balance Sn together with any unavoidable impurities;
wherein the alloy begins to melt at approximately 138° C.
26 . The alloy as claimed in claim 1 , wherein the Bi is present in a concentration between 35 and 50 wt %.
27 . The alloy as claimed in claim 15 , wherein the Bi is present in a concentration between 35 and 50 wt %.
28 . The alloy as claimed in claim 25 , wherein the Bi is present in a concentration between 35 and 50 wt %.