Evaporation boats & Crucibles:
AlN ceramic will not or will only slightly beeing wetted by many types of molten metals. Therefore the product live is long and superior to other ceramic or graphite materials.
In picture 1 you see an evaporation boat for molten alumiminium metal, operated e. g. in HCl acidic atmospheres at about 900° C.
Almost any shape of melting pots is available.
In picture 2 you see a crucible with lid.