| 摘要 |
PURPOSE:To provide a combustion cylinder which has a high emissivity and is excellent in durability by sintering under special conditions the aluminium plated steel plate of the main body of a combustion cylinder, and conducting high temperature oxidizing treatment of the surface plated-layer to form a surface layer which has a rough surface and is subjected to blackening treatment on the internal circumferential face and outer circumferential face respectively of the main body of the combustion cylinder. CONSTITUTION:An aluminium plated steel plate is subjected to a metal plate working such as drilling holes, and the main body 8d of a combustion cylinder which is a development of a combustion cylinder 8 is subjected to a high temperature oxidizing treatment which effects sintering at 800-900 deg.C for 5-15 minutes to form on the internal and external circumferential faces of the combustion cylinder main body 8d surface layers 8b and 8c which have respectively a rough surface and have undergone a blackening treatment. Next the combustion cylinder main body 8 which has the surface layers 8b and 8c formed is bent into a cylindrical shape, and its ends to be matched is welded to complete the formation of the combustion cylinder 8. On its surface layers 8b and 8c, Al-Si oxide, Al-Si alloy layer and Fe-Al-Si alloy layer are formed so that the formation of iron scale on the base material is suppressed, and at the same time the heat resistance and durability of the cylinder 8 can be raised because of the high melting point of the alloy layers.
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