It's complicated. You have to dissolve a fine ceramic powder in a solvent. To dissolve the alumina you can use a dispersant. A dispersant increases the separation of particles and prevents settling or clumping of the alumina. Then you add in the monomers and the initiators. You can use a speedmixer or 3 roller to blend it all.
So typically, your binder systems involves various components.
If you use a classical bottom up SLA process with a vat and silicone you can not have a very high volume fraction of for example alumina. Typically this will be around 50 % if you still want to be able to re-coat in reasonable times.
After illumination you obtain the green part. You then put it in the oven and melt out, the monomers, solvents, initiators etc. When this is completed you again put it in the oven and sinter the alumina. The part will shrink a lot during this process. If you don't do it correctly you will get cracks and pores.
I have never seen successful parts with a system similar to Envisiontec's perfactory.
One of the first companies to introduce printed ceramics was Lithoz, see for example the following Youtube video http://www.youtube.com/watch?v=jfdcJlfUGxo
Specs of their process:
Lateral resolution 40 μm (635 dpi)
Building velocity up to 100 slices per hour
Slice thickness 25 – 100 μm
Number of pixels (X, Y) 1920 x 1080
Building envelope (X, Y, Z) 76 mm x 43 mm x 150 mm
Data format .stl (binary)
Light source LED
Probably, their different recoating mechanism allows them to use a higher volume fraction. If a high volume fraction is used, the whole process is simplified substantially. At the moment, alumina parts can only have wall thickness up to 1 cm.
Ceratec, a dutch company, bought a Lithoz machine an re-engineered the printer and slurry. In November 2013 they founded Admatec.
The article at 3Ders is about the printing of metal.The process is very similar to ceramics. One dude at ECN now does some experiments and so far this resulted in structures up to 100 layers. I guess he uses an admatec or lithoz machine. Layer thickness is around 10 micrometer. At a conference he has shown SEM (scanning electron microscope) images. I don't have them here, but I can guarantee that you can not distinguish individual layers (this is good). You will need a very special oven to sinter the metal.