Metal substrate

Abstract

A honeycomb structure brazed with an outer casing has a large corrugated foil and a small corrugated foil overlapped and wound alternately and formed like a cylinder by diffused junction. The large corrugated foil and the small corrugated foil has 20 μm in thickness. The honeycomb structure has 900 cells/square inches in cell density. The large corrugated foil has a wave height of 0.81 mm and a pitch of 1.71 mm. The small corrugated foil has a wave height of 0.05 mm to 0.18 mm and a pitch of 1.29 mm to 1.39 mm. Whereby the produced stress in each corrugated foil upon thermal expansion is reduced.

Dependencies are inferred from the claim text.