V.M.Sglavo–2017

V.M. Sglavo – CerMatEng - UNITN 2017

Slip casting

suspension

porousmould• plasterofParis-CaSO4.2H2O–• polymericresinporosity=40-50%maxporesize≈5µm

solvent

removalofthesuspensionin

excess

Principles of ceramics processing, 2nd ed., J.S. Reed, J. Wiley & sons, 1995

removalofthesprue

mouldopening

Principles of ceramics processing, 2nd ed, J. S. Reed, J. Wiley & Sons, 1995 – Ch. 25, 26

V.M.Sglavo–2017

V.M. Sglavo – CerMatEng - UNITN 2017

Introduction to the principles of ceramic forming, J.G. Heinrich, CFI, 2004

Pressure casting

V.M.Sglavo–2017

V.M. Sglavo – CerMatEng - UNITN 2017

t=0 t≈2min

t≈2h

V.M.Sglavo–2017

V.M. Sglavo – CerMatEng - UNITN 2017

V.M.Sglavo–2017

V.M. Sglavo – CerMatEng - UNITN 2017

Formation of the “cake”

suspension(DPS>1)

consolidatedlayer(DPS=1)

mould

wet

dry

L

�

L = 2kmPtαη

⎡

⎣ ⎢

⎤

⎦ ⎥

0.5

permeabilityoftheconsolidatedlayer

�

α = Vc

Vs

−1

solidfractionintheconsolidatedlayer

viscosityoftheliquid

solidfractioninthesuspension

Pcap=2ϒLVcosθ /R

2R

Principles of ceramics processing, 2nd ed., J.S. Reed, J. Wiley & sons, 1995

pressure(capillar+external)

V.M.Sglavo–2017

V.M. Sglavo – CerMatEng - UNITN 2017

Pressure effect +0.5wt%PVAbinder

Principles of ceramics processing, 2nd ed., J.S. Reed, J. Wiley & sons, 1995

V.M.Sglavo–2017

V.M. Sglavo – CerMatEng - UNITN 2017

Tape casting

teIlon,mylar,acetate

H

h0L

Principles of ceramics processing, 2nd ed., J.S. Reed, J. Wiley & sons, 1995

Introduction to the principles of ceramic forming, J.G. Heinrich, CFI, 2004

V.M.Sglavo–2017

V.M. Sglavo – CerMatEng - UNITN 2017

H = ADr h0 1+

h02 P

6η vL⎡

⎣ ⎢ ⎢

⎤

⎦ ⎥ ⎥

densityofthesuspension/densityofthedrylayer

pressure(hydrostatic)

viscosityofthesuspension

η(mPas)

Principles of ceramics processing, 2nd ed., J.S. Reed, J. Wiley & sons, 1995

V.M.Sglavo–2017

V.M. Sglavo – CerMatEng - UNITN 2017

suspensions

Introduction to the principles of ceramic forming, J.G. Heinrich, CFI, 2004

V.M.Sglavo–2017

V.M. Sglavo – CerMatEng - UNITN 2017

multilayer

Principles of ceramics processing, 2nd ed., J.S. Reed, J. Wiley & sons, 1995