| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a honeycomb structure having excellent thermal shock resistance. <P>SOLUTION: The honeycomb structure 1 comprises: a honeycomb base material 2 composed of a porous ceramics and having a plurality of cells extending to the axial direction; and an outer circumferential material layer 4 composed of a ceramics covering the outer circumferential face in the circumferential direction of the honeycomb base material 2. Provided that the thermal expansion coefficient at 300 to 900°C in the honeycomb base material 2 is denoted as α<SB>I</SB>(ppm/K) and the thermal expansion coefficient at 300 to 900°C in the outer circumferential material layer 4 is denoted as α<SB>II</SB>(ppm/K), the value of α<SB>I</SB>-α<SB>II</SB>is 1.0 to 5.0(ppm/K). <P>COPYRIGHT: (C)2009,JPO&INPIT |
