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Ceramic printing on m2?
Posted: Wed Sep 16, 2015 3:19 am
by hybridprinter
Could it be done with a ceramic extruder?
Need parts to withstand 600 degrees C and be dimensionally accurate to 0.2mm
Is this only the world of DMLS?
Re: Ceramic printing on m2?
Posted: Wed Sep 16, 2015 3:44 am
by insta
Lost-PLA casting?
Re: Ceramic printing on m2?
Posted: Wed Sep 16, 2015 4:06 am
by hybridprinter
No molding, no casting.. Need to print and bake.. Would like stainless steel but no chance at extruding that so ceramic paste was the only other super high temperature, high heat dimensionally stable material I could think of for extrusion.
Assuming the new WASP LDM extruder prints as clean and accurate as they say.. The next question is how much shrink happens in the kiln..?
http://www.3ders.org/articles/20150721- ... nting.html
Re: Ceramic printing on m2?
Posted: Wed Sep 16, 2015 8:25 pm
by insta
Why that requirement? You're inventing a problem. Lost PLA already works.
Re: Ceramic printing on m2?
Posted: Wed Sep 16, 2015 11:23 pm
by Vandal968
There was a recent successful kickstarter where a chemical engineer is using the funds to develop an FDM filament with MIM powder in it. It should do what you (and many of us) want, but he doesn't have it working yet the last time I checked.
cheers,
c
Re: Ceramic printing on m2?
Posted: Thu Sep 17, 2015 12:06 am
by ednisley
hybridprinter wrote:how much shrink happens in the kiln
Back in the day, multi-layer ceramic substrates started as laminated green sheets created by screening a slurry (about the consistency you might extrude) that shrank by 20% in each dimension during firing. That works out to 50% by volume; the difference between green and fired substrates was a wonder to behold.
They bonded 100+ integrated circuits with 100+ solder-ball contacts apiece to the fired substrates with decent yield. You just expand the ceramic features by the linear shrink factor and the fired result comes out dead on, at least after they got the whole affair reduced to an industrial process.
The substrates fired in a pure hydrogen atmosphere inside electrically heated conveyor kilns, in a huge room with blowout panels on all exterior walls facing revetments to direct the blast upward and away from the rest of the facility.
That's where I learned hydrogen burns with a lovely flame that's almost invisible unless you look carefully...
Re: Ceramic printing on m2?
Posted: Thu Sep 17, 2015 12:21 am
by Vandal968