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Enhanced Flow Characteristics
Die casters know
that a completely flat surface makes it impossible for metal to flow and
fill cavities correctly.
MetaLLife
purposely creates a uniform micro textured surface. This micro topographic
change allows metal to flow more uniformly and helps to reduce flow marks,
which sometimes become visible when castings have subsequent coatings or
painting done to them.
The wave action of
the topography also breaks up the entrained gases in the molten metal. This
produces castings with more homogeneous porosity distribution of the smaller
trapped gases instead of the large random areas. The reduction in
porosity and laminations allow quicker and easier polishing of castings when
required. The changed surface helps buffer cavitation effect.
This leads to a much more destructive die failure mode - metal
break out. For these reasons the runner and gate of all inserts are automatically included areas
for processing with
MetaLLife.
Magnesium castings
are stronger and lighter than aluminum so their wall thickness is usually
less. Proper flow is critical in such applications. By applying
MetaLLife, the magnesium die caster is able to obtain this necessary flow
without laminations, porosity, and cold shot flow marks.
The
MetaLLife
created surface is uniform and has complete coverage without stress
risers or sharp areas that would lead to premature failure of the tool.
When
MetaLLife
is followed by
ThermaLLife,
the changed grain boundaries allow more nitrogen and carbon to be diffused
into the surface. This raises the fatigue resistance of steel.
See: Journal of Solid Mechanics and Material Engineering -
Vol 2 No 11 2008
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