| 摘要 |
A structure having an annular body by forming a base of the structure in an annular body is provided to obtain remarkable effects that can accomplish the originally contradictory effects of high speed temperature rise in the structure and prevention of overheating in the structure at the same time. A structure(10) comprises a base(11) made of a metal and an inorganic material surface layer(12) made of crystalline and amorphous inorganic materials, wherein thermal conductivity of the inorganic material surface layer is lower than that of the base, infrared emissivity of the inorganic material surface layer is higher than that of the base, and the base is an annular body. The inorganic material surface layer has the thermal conductivity ranging from 0.1 to 2 W/mK at room temperature. The inorganic material surface layer has the emissivity ranging from 0.7 to 0.98 in a wavelength range of 1 m to 15 m at room temperature. The base has irregularities(RzJIS) formed on the surface thereof in an amount corresponding to 1/60 or more of thickness of the inorganic material surface layer. |
