Ceramic substrates made of cordierite
have been used in the purification of exhaust gas from automotive
engine engines world-wide. In addition to light weight, a
variety of shapes offer flexibility for the converter design.
Over 1 billion substrates have to date been used in automotive
applications.
Robust,
large-surface ceramic substrates
Characteristics
of HONEYCERAM® with square cell structure:
Description
Unit
8/300
6.5/400
5.5/350
Wall
thickness
mm
0.203
0.165
0.140
Cell
pitch
mm
1.47
1.27
1.36
Open
frontal area
%
74.3
75.7
80.5
Hydraulic
diameter
mm
1.27
1.11
1.22
Geometric
surface area
cm2/cm3
23.5
27.4
26.4
Advanced
Ceramic Substrates
Automobile manufacturers and emission system
suppliers continue to provide new technology for low temperature
capability and high temperature durability. The targets of
higher engine power (reduced pressure drop), higher fuel economy,
and durability continue to be required from the automotive
industry. Various new technologies are presently available
for these requirements and are presented here.
Thin
Wall and Ultra Thin
Wall Substrate
Bulk density and cell structure have a direct
effect on the warm-up characteristics of the substrate. By
reducing the bulk density wall thickness, and increasing geometric
surface area (GSA), the substrate not only warms up faster,
but also improves catalytic activity.
Compliance
with tighter emission regulation.
Catalyst
down-sizing and saving precious metal.
Low
pressure drop.
Characteristics
of Thin Wall (TW) and Ultra Thin Wall (UTW) HONEYCERAM®
with square cell structure:
