I came across this when one of the Reprap member was looking for hardened Steel Nozzle.
HE quoted,”Wonder if anyone has experience with hardened steel nozzles? For flashforge
http://www.3dxtech.com/mk10-hercules-a2-hardened-steel-nozzle-0-40mm/”
Of course I heard of the ceramic nozzle…
Thus this was what I got.
http://3dobjectifying.blogspot.sg/2012/12/ceramic-hotend-part-1.html