Page 489 - 04. Subyek Engineering Materials - Manufacturing, Engineering and Technology SI 6th Edition - Serope Kalpakjian, Stephen Schmid (2009)

Section 18.2 Shaping Ceramics 46

Air (filtered)
Exhaust
in
out
Ceramic tape
on carrierta e - I - Slurry chamber and
1: ....' doctor blade [Ceramic slurry
p
Ir
Drying
Supply lube
will HQ
i ii
,.'I"~;"*
"`

Take-up 5
§"'

er .....
spool 3* Carrier film
§
Controller
for take-up
SpOO|
Doctor blade
Ceramic film 2%

l
Carrierfilm

FIGURE |8.4 Production of ceramic sheets through the doctor-blade process.

l,...l,l,ll,,le ,lrre g‘» - Formed
l i
Water
chamber slug
Bat former
To Vacuum
JIQQGV tool
',,}
§ as `
1 _ v
Deal |'lHQ Clay
W re
"¢=,
Y

i
_
“i#lw~mevlv¢*4'
Extruder
1 l
l\/Iold return
(3) (b)
FIGURE |8.5 (a) Extruding and (b) jiggering operations. Source: After R.F. Stoops.

l8.2.3 Pressing

Dry Pressing. This is a technique similar to powder-metal compaction, as de-
scribed in Section 17.3. Dry pressing is used for relatively simple shapes, such as
Whitevvare, refractories for furnaces, and abrasive products. The moisture content of
the mixture generally is below 4%, but it may be as high as 12%. Organic and inor-
g anic bind ers (suc h as stearic acid, Wax, starch, and polyvinyl alcohol) usually are