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DPF Material, Cell Density
- DPF material should be chemically inert and have low thermal expansion and high melting temperature.
- Porous cordierite ceramic
 has been commonly used for diesel particulate filters. Its melting temperature is 
- The soot burns without catalyst at a temperature of
 . However, if the soot starts to burn uncontrollably the DPF may experience temperature of 1300º C or higher resulting in melting of the ceramic filter. Typical temperatures achieved in the ceramic filter when soot gets burned are shown on Fig 6.15 for a 100 and a 200 cpsi DPF. Due to lower thermal capacity of the 100cpsi DPF, higher ceramic temperatures result when soot deposited on the DPF is burned. To overcome possible meltdown due to uncontrolled regeneration of DPF more advanced materials withstanding even higher temperature are required.
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| Figure 6.15 |
Maximum temperature attained during uncontrolled regeneration for two diesel particulate filters (144 mm dia X 150 mm length) having 100 and 200 cpsi cordierite substrates, 200 cpsi substrate has higher mass hence lower peak temperatures. |
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