| 摘要 |
PURPOSE:To make improvements in heat resistance, thermal shock resistance or the like, by installing a heat insulating layer which makes porous frains, made up of granulating a ceramic fiber and whiskers, stick fast to an inner surface of an exhaust system apparatus where exhaust ags passes through, and installing a fireproofing layer consisting of fireproofing material powder on the surface. CONSTITUTION:In an exhaust system apparatus, for example, an exhaust manifold of an internal combustion engine, a heat insulating layer, making porous grains, made up of granulating a ceramic fiber and whiskers, stick fast to the inner surface, is formed, and furthermore a fireproofing layer tightly attached with fireproofing powder is formed in the surface whereby an increase of useful life longevity in the exhaust system apparatus is promoted. At the time of manufacturing the exhaust system apparatus like this, first an inorganic binder solution is uniformly applied to an inner surface of the exhaust system apparatus and then the porous grains, made up of granulating the ceramic fine and/or the whiskers, is stuck on the top. After doing like this, a process of curing, drying and solidification is carried out at least one time and the heat insulating layer is formed, and afterward the same treatment takes place on a surface of this heat insulating layer, forming the specified fireproofing layer.
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