| 摘要 |
An exhaust manifold (10) of the present invention comprises a liner (12) that includes inner surface (14) defining manifold passages and an outlet surface (16). The exhaust manifold (10) includes a shell (18) of a homogeneous and continuous material disposed over the outer surface (16) of the liner (12). The shell (18) and liner (12) of the exhaust manifold (10) include first (60) and second (72) composition formed from ferrous and non-ferrous metal powders (62), ceramic powder (64), and a binder (74) added thereto to form the manifold (10). The invention discloses a method of making the exhaust manifold (80) that comprises the steps of forming the liner (12) and molding the shell (18) of a homogeneous and continuous material completely encapsulating the outer surface (16) of the liner (12). Accordingly, the exhaust manifold (10) of the subject invention has a reduced weight and dissipates heat energy contained in the exhaust thereby increasing the efficiency of the catalytic converter (42). Additionally, the method (80) of the present invention provides for seams-free shell (18) of the manifold (10).
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