Structural member
AssigneeToto Ltd.
InventorsAtsushi Kinjo, Nobutomo Otsuka, Fumito Toda
Life of this patent
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Abstract
A structural member 10 includes a base material 100 and a protective film 200 covering a surface 110 of the base material 100. When, in a cross-section of the protective film 200 cut perpendicularly to the surface 110, a proportion of pores per unit area is defined as porosity, the porosity in a first portion 201 that is a portion of the cross-section is lower than the porosity in a second portion 202 that is a portion of the cross-section closer to the base material 100 side thereof than the first portion 201.
Claims5
A structural member comprising a base material and a protective film covering a surface of the base material,
- wherein a coefficient of thermal expansion of the protective film is different from a coefficient of thermal expansion of the base material,
- wherein when, in a cross-section of the protective film cut perpendicularly to the surface, a proportion of pores per unit area is defined as porosity,
- the porosity in a first portion that is a portion of the cross-section is lower than the porosity in a second portion that is a portion of the cross-section closer to a base material side thereof than the first portion,
- wherein an average value of cross-sectional areas per pore of pores included in the first portion is smaller than an average value of cross-sectional areas per pore of pores included in the second portion.
Dependencies are inferred from the claim text.