The microstructure of rapidly solidified laser-molten Al4.5 wt.% Cu alloyed surfaces was studied, and melted regions were found to resolidify epitaxially onto unmolten
crystalline substrates .
A melt filter (Type SF60, Gneuss Kunststofftechnik GmbH, Bad Oeynhausen, Germany) with a mesh size of 200 [micro]m was used to filter unmolten
The sample was post-heated at 170[degrees]C for 5 min in a convection oven to allow the unmolten
polymeric powders to coalesce and level until a smooth film was formed.
On the contrary, the "unmolten
flaws" such as cross-linking or oxidation affect the polymer structure.
One is the dense and smooth zones, indicating good molten state of particles; the other one is the rough and porous zones, indicating unmolten
or semimolten state of particles.
In contrast to this effect with POM no unmolten
particles are visible, but oriented crystals on the upper surface of the cross section indicating that crystallization took place before particles of the subsequently applied layer could be molten, Fig.
Sea floor spreading: occurs when two tectonic plates separate because magma, which is more buoyant than the surrounding cold (unmolten
) rock rises toward the plate edges.
It is determined that one of the ways of uniform melting of the initial bar and flowing off of the melt into the general zone is formation of cells of unmolten
initial material on the melting surface at minimum thickness of the melt.
The rate of compression should be such that air is forced back toward the feed pocket, but not so severe that blockage occurs as a result of unmolten
Of the major model tests developed at the Deutsches Kunststoff-Institut, the universal disk wear and friction tester for unmolten
raw material can be used to illustrate the principles for simulating wear in laboratory surroundings.
In the fully filled region, the unmolten
polymer particles are suspended in the previously molten polymer, and melting progresses through heat dissipation, mainly.