We used a lot of types of oxide ceramics based on Al2O3 and even used Spinel (MgAl2O4) ceramics - refractory concrete, which is even more stable, but Ni3Al always oxidized and not melt. We are trying to reach molten state of Ni3Al to measure wettability of ceramic materials and Ni3Al. Do you have any advices ? Thanks a lot
Heating speed: 5°C/min
Ni3Al is non-alloyed
Oxide ceramics - many types - Al2O3 up to 82%
I have melt this alloy in a ZrO2 crucible under vacuum (Ar atmosphere). I did not face any problem. Under air you must have many problems of Al oxidation.
But ZrO2 IS extremely expensive material. We are trying to melt thin alloy on premium refractory materials - but with good price ratio - like mullite-corundum.
I see. The problem is the Silicon contamination from mullite. If you melt it in an alumina crucible you may have no problem. However, you must neutralize the atmosphere with vacuum or argon.
Thanks for your reply. We used SPINEL concrete bonded with CaO too, which is very stable. This material was prepared with many components from MgAl2O4 and CaO. There should be no SiO2. What is the problem at this point ?
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