Honeycomb filter

Abstract

The material forming a sealing body (30) contains more Al element, Fe element, B element, Si element and free carbon than the material forming a honeycomb structure (23). Each sealing body (30) has a projected portion (31) in the central position corresponding to the central axis (X) of a related cell (28). By having the projected portion (31), thermal expansion of the sealing body (30) is concentrated in the central position, thereby reducing thermal expansion in the areas outside the projected portion (31).

Description

Honeycomb filter technical field The present invention relates to a honeycomb filter for trapping and removing particulate matter and the like contained in exhaust gas of, for example, internal combustion engines, boilers, and the like. Background technique In recent years, in consideration of the impact on the environment, the need to remove particulate matter contained in exhaust gas from combustion devices such as internal combustion engines and boilers has increased from exhaust gas. In particular, standards related to the removal of particulate matter (hereinafter referred to as PM) such as graphite particles discharged from diesel engines have been strengthened in Europe, America and Japan. As a trapping filter for removing PM and the like, a honeycomb structure called DPF (Diesel Particulate Filter-Diesel Particulate Filter) is used. The honeycomb structure is accommodated in a casing provided in an exhaust passage of the combustion device. The honeycomb structure...

AI Technical Summary

Problems solved by technology

If a crack occurs in the sealing body, insufficiently purified exhaust gas will leak through the crack, resulting in a decrease in filter performance, that is, a decrease in the purification efficiency of exhaust gas.

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