Appeal 2007-2359
Application 90/006,951
79. Timsit teaches that other metal particles may be added to the eutectic
alloy forming metal to yield joined parts with improved properties. (Timsit
at 3:12–45.)
80. In particular, Timsit teaches that:
[a]dditions of Mn and excess Si may yield superior
extrudability of the brazed components. All the superior
properties described above would be achieved by diffusion of
brazing-mixture additives into the brazed components and their
subsequent reaction with elements or precipitates in the core
alloys. Diffusion may be accomplished either during brazing or
by an appropriate heat treatment following brazing.
(Timsit at 3:38–45.)
Marchive
81. Marchive teaches that homogenizing is a two-step treatment
comprising a high temperature stage and a cooling stage. (Marchive at 8,
col. 1.)
82. According to Marchive, if the cooling rate is in excess of 500°C per
hour, a solid solution supersaturated in Mg2Si will be obtained, having high
resistance to deformation and lower extrusion velocity. (Marchive at 8,
col. 1.)
83. On the other hand, Marchive teaches that if the cooling rate is slow,
e.g., 20°C per hour, the solid solution will contain little Mg or Si, because
Mg2Si will have fallen out of the solution as coarse precipitates. (Marchive
at 8, col. 1.)
84. In Marchive's words, "[t]he cooling rate therefore has to be adjusted to
yield finely divided Mg2Si precipitates which can redissolve during
extrusion." (Marchive at 8, col. 1.)
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