EXHAUST PIPE AND EXHAUST PIPE MANUFACTURING METHOD

WIPO Patent Application WO/2012/093697

A1

Disclosed is an exhaust pipe comprising a metallic substrate and, formed on the surface of thereof, a surface coating layer containing an inorganic amorphous material. The surface coating layer is porous and, if the surface coating layer in an electron microscope image at 500x magnification of a cross section parallel to the thickness direction of the exhaust pipe is cut in the direction perpendicular to said exhaust pipe thickness direction into five rectangular sections that have 1/5 the thickness of the surface coating layer after said cut, there is at least one pore-concentrated section which is a rectangular section having pores making up 30% or more of the pore area of the entire surface coating layer. The pore-concentrated section comprises the central section of the five rectangular sections, or one or two of the rectangular sections adjacent to said central rectangular section. The pores present in the aforementioned surface coating layer include closed pores, but said closed pores do not connect the outside of the exhaust pipe and the surface of the aforementioned substrate.

MUTSUDA FUMIYUKI (JP)
FUJITA YOSHITAKA (JP)

PCT/JP2012/050106

July 12, 2012

January 05, 2012

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IBIDEN CO LTD (JP)
MUTSUDA FUMIYUKI (JP)
FUJITA YOSHITAKA (JP)

F01N13/16; C23C26/00; F01N13/08; F01N13/18

JP2003253475A	2003-09-10
JP2001047559A	2001-02-20
JP2010168998A	2010-08-05
JP2009133214A	2009-06-18

YASUTOMI & Associates (JP)
Patent business corporation Yasutomi international patent firm (JP)

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