Low oxygen content alloy compositions
A composition and alloy technology, applied in metal material coating process, vacuum evaporation plating, coating and other directions, can solve the problems of reducing the magnetic properties of materials, reducing performance, etc.
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Embodiment 1
[0016] Example 1: A series of melting tests of three Ni-Mn alloys were carried out. The melt charge components required for each test are shown in Table 2. The melt charge components were prepared with 99.95% pure Ni spheres and 99.9% pure Mn flakes.
[0017] Melt Fill Components
[0018] In the first melting experiment, the alloy block was directly solidified in a MgO crucible. In the second and third melting experiments, the alloy was melted and cast into graphite molds. The graphite mold was sprayed with BN and preheated to 500°F in a separate furnace before being installed in the VIM unit chamber. In all three melting experiments, the VIM unit chamber was evacuated to about 0.05 mbar in preparation for the melting operation.
[0019] Melting operations for all three melting tests were performed by applying a voltage of 5 kW to the VIM unit for 20 minutes and by increasing the voltage by 5 kW every 5 minutes for an additional 20 minutes. For the first melting ...
Embodiment 2
[0023] Implementation 2: Melting tests were carried out using 2427 grams of 99.9% pure Mn flakes and 5037 grams of 99.9% pure In rods. In addition to the Mn and In components, add 25 grams of CaSi 2 and 10 g Ce as a deoxidizer. The molten charge was preheated to 500°F under a partial vacuum of 0.07 mbar in a MgO crucible within the VIM unit chamber. The VIM cell chamber was then backfilled with argon to 500 mbar and the molten charge sample was melted by applying a voltage of 5 kW to the VIM cell for 20 minutes and by increasing the voltage by 5 kW every 5 minutes for a further 20 minutes. The molten charge is then cast into graphite molds.
[0024] image 3 It is a SEM micrograph characterizing the microstructure of the just-cast In50Mn at.% alloy. The microstructure characterized by this micrograph consists of three phases: a light In matrix, a (In,Mn) solid solution shown in the light gray phase, and InMn shown in the dark gray area 3 compound. The black dots in the m...
Embodiment 3
[0027] Example 3: Melting tests were carried out using 13.500 kg of Pt pellets of 99.9% purity and 4.724 kg of electrolytically produced iron flakes of 99.97% purity. Add 91 grams (about 0.50 wt.%) of CaSi to the molten filler 2 for deoxygenation. The filler is placed on a layer with alternating layers of Pt and Fe and CaSi 2 Evenly distributed in the crucible between the layers. The VIM unit chamber was sealed and evacuated to an initial level of 0.07 mbar. The chamber was then backfilled with argon, maintaining a pressure of 500 mbar during melting and casting. Melting was achieved by applying a voltage of 5 kW to the VIM unit for 20 minutes, followed by 5 kW increments every 5 minutes for an additional 20 minutes. The mold system was an 8.00" wide, 15.00" long and 0.60" thick graphite shell.
[0028] Figure 4 It is an optical micrograph characterizing the microstructure of the as-cast Fe45Pt at.% alloy. The microstructure consists of highly twinned particles of sing...
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