| Evaluation of Mechanical and Thermal Properties
of Ceramic Honeycomb Substrates
for Long Term Durability |
Rathindra Nath Das, C. D. Madhusoodana and Kiyoshi Okada
Pages : 111-117
DOI : 10.1080/0371750X.2002.10800043 |
| Abstract |
| Ceramic honeycomb substrates used in catalytic converter and
die~el partic~late filters.for automobile pollution control appliˇ
cat1ons requ1re long term durability, and 80,000 km on-road run
for gasoline-powered passenger cars in India. The durability of
honeyc~mb substrates depends not only on basic physical,
mechamcal and thermal properties of honeycombs, but also on
thermal stresses generated during use, and canning or mounting
pressure. These key properties of honeycomb substrates were
characterized. The properties that affect thermal and mechanical
durability are found to be dependent on the design parameters
such as cell density and honeycomb volume ratio of honey~
omb su~~trates. The thermal stresses generated by the operatmg
cond1t1ons were calculated and it was found that the honeycomb
substrates could very well withstand these stresses. The
optimum mounting pressure was calculated and applied for canning
design. Thus, fabricated catalytic converter was subjected
to on-road durability trials with four Indian vehicles on specified
route scattered in different regions of India accumulating in
excess of 80,000 km field run. Periodic inspection and back
pressure testing carried out during intermediate emission tests
showed that the developed ceramic honeycombs are durable
beyond 80,000 km run. |
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