| 摘要 |
A wide sheet (6) formed of a metal foil is wound a plurality of times around outer peripheral surfaces of four honeycomb matrices (4a-4d) arranged in series to form an intermediate tube (8). As a result, a subassembly is formed. A brazing filler material is wound around an outer peripheral surface of the subassembly at an end portion thereof. The subassembly is inserted into an outer tube (2). The outer tube (2) is caulked to reduce an outer diameter thereof. Then, heat processing is perfomed in vacuum to diffusion bond a corrugated sheet and a flat sheet, which form the honeycomb matrices, and the wide sheet (6) of the intermediate tube (8) to each other. The intermediate tube (8) and the outer tube (2) are brazed to each other. Thus, a metal substrate (1) for carrying a catalyst is achieved. <IMAGE> |
