| 摘要 |
PURPOSE:To make improvements in heat resistance, impact resistance, vibro- proof or the like, by installing a fireproof insulating layer which makes porous grains, made up of granulating a ceramic fiber ad whiskers, stick fast to an inner surface of an exhaust system apparatus where high temperature exhaust gas passes through. CONSTITUTION:In an exhaust system apparatus, for example, an exhaust manifold of an internal combustion engine, a fireproof insulating layer, making porous grains made up of granulating a ceramic fiber and/or whiskers, stick fast to the inner surface is formed. With this formation, heat resistance, impact resistance, vibro-proof, etc., are improved, whereby an increase of service 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 an admixture of the porous grains made up of granulating the ceramic finer and/or whiskers and a little binding assistant consisting of refractory grains at need stuck on top of that. After doing like this, a process of curing, drying and solidification is carried out as much as at least one time and thus fireproof insulating layer is formed up.
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