| 摘要 |
An exhaust manifold ( 10 ) of the present invention comprises a liner ( 12 ) that includes inner surface ( 14 ) defining manifold passages and an outer 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 ). 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 ).
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