| 摘要 |
PCT No. PCT/JP97/02898 Sec. 371 Date Oct. 20, 1998 Sec. 102(e) Date Oct. 20, 1998 PCT Filed Aug. 20, 1997 PCT Pub. No. WO98/37253 PCT Pub. Date Aug. 27, 1998In order to control the precipitation and formation of a deposition produced in an inner face portion of a heat transmitting tube for a boiler due to a boiler water and the formation of an oxide scale of a tube material due to overheated steam, there is provided a heat transmitting tube for a boiler provided with a porous sprayed coating. The porous sprayed coating is formed by using a metalxalloy having excellent high temperature oxidation resistance and corrosion resistance at high temperature as compared with a material of the heat transmitting tube onto an outer heat receiving surface for contacting a combustion gas, and optionally an oxide ceramic, and optionally an oxide cermet. Solid inorganic sintered fin particles are penetrated and filled in opening pores of the porous sprayed coating and form a heat shielding layer on the surface of the porous sprayed coating. The solid inorganic sintered fine particles are solidified at high melting point to produce a heat shielding function to thereby prevent excessive heat flow to the heat transmitting tube.
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