| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a manufacturing method of a turbine housing which inhibits supercooling of an exhaust gas, and to provide the turbine housing.SOLUTION: In a turbine housing 31, an exhaust gas passage 41 for passing an exhaust gas and a coolant passage 37 for circulating an engine coolant are formed therein. In the manufacturing of the turbine housing 31, firstly, a housing body 43, in which the exhaust gas passage 41 and the coolant passage 37 are formed, is formed. Then, a surface layer 41a made of a material having a heat transfer rate lower than that of the housing body 43 is formed on a surface of the exhaust gas passage 41 in the housing body 43.</p> |
