| 简介 |
PROBLEM TO BE SOLVED : To diffusion-join all contact parts in a metallic carrier made of Ti and/or Nb added ferritic stainless steel and obtd. by superposing flat foil and corrugated foil and winding them or alternately laminating plural sheets of flat foil and corrugated foil and inserting the resultant honeycomd body into an outer tube. SOLUTION : This carrier contains a specified amt. of Ti and/or Nb, satisfied [Nb]+2[Ti]<=8[C]+48/7[N]+3[S]+6[O]+0.1 and has diffusion-joined contact parts or further contains a specified amt. of a rare earth element and satisfies [Nb]+2[Ti]<=8[C]+48/7[N]+0.1. This carrier preferably has a diffusion-joined middle tube between the outer tube and honeycomb body, and the outer tube, honeycomb body and middle tube and preferably different from one another in the concn. of Cr and/or Al by a specified value. At the time of production, the degree of vacuum, the surface roughness of each foil and the contact width of the foil are limited and producing processes can be simplified by extensively adopting diffusion joining. |
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