| 摘要 |
PURPOSE:To provide constructive strength for an internal ceramic-fiber pipe on the outside of which an external pipe made of light alloy is formed, by having ceramic particles stick to the internal peripheral surface of the ceramic fiber. CONSTITUTION:An exhaust manifold 1 is made up in such a manner that an internal pipe 2 shaped in the specified manifold form is integrally cast in an external pipe 3 made of aluminum alloy. The internal pipe 3 is mainly made of ceramic fiber and the internal peripheral face 5 which is a face exposed to exhaust gas is provided with higher structual strength by sintering ceramic particles 6 to the crossing parts of and the spacings of the ceramic fiber 4. When an engine is operated, the internal peripheral face 5 of the internal pipe 2 is kept exposed to high-temperature exhaust gas, however, the internal peripheral face 5 has high structual strength as mentioned above so that the ceramic fiber 4 can be prevented from separation and detachment from said face due to thermal stress, pulsated pressure of exhaust gas and vibration.
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