| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing a composite sintered compact which can efficiently produce a composite sintered compact of high quality composed of different kinds of metallic materials per parts by setting an atmospheric gas upon sintering, to provide a composite sintered compact having high mechanical properties and dimensional precision which is produced by using the method for producing a sintered compact, and to provide a fuel injection valve provided with a component composed of the composite sintered compact. SOLUTION: The method comprises: a molding stage where, using a first kneaded matter 21 comprising first metal powder and a binder and a second kneaded matter 22 comprising second metal powder having a composition and crystal structure different from those of the first metal powder and a binder, a secondary molded body 4 is produced in such a manner that, in the respective kneaded matters 21, 22, the second kneaded matter 22 is subjected to insert-molding with the primary molded body 3 of the first kneaded matter 21 as an insert work; and a firing stage where the second molded body 4 is fired so as to obtain a composite sintered compact, wherein, the atmospheric gas in the firing stage is set in such a manner that the crystal structure of the second metal powder shifts to the structure same as that of the first metal powder. COPYRIGHT: (C)2010,JPO&INPIT
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