Process for manufacturing valve seat made of sintered FE alloy a

Details Process for manufacturing valve seat made of sintered FE alloy a Process for manufacturing valve seat made of sintered FE alloy a

1997-12-29

1999-11-02

Yuen, Henry C.

Internal-combustion engines

Valve

Valve seat relation

1231883, 298884, 75246, 419 6, B22F 500, B22F 702

Patent

active

059750391

ABSTRACT:
A process for manufacturing a valve seat which is made of a sintered Fe alloy and comprises a main layer of a valve seat and a contacting layer, comprises the steps of preparing either a powdery Cu or a powdery material containing Cu in a powdery Fe alloy, forming a green compact body with two green compact body layers, one of which is the main layer and the other of which is the contacting layer, and which are made of the prepared powdery Fe alloy containing Cu, sintering the green compact body. According to the present invention, the infiltration of Cu from the main layer to the contacting layer of the valve seat is not generated as the conventional sintering process for manufacturing the valve seat comprising the two layers without the independent infiltration treatment of Cu, and, therefore, the valve seat obtained of the present invention has an high abrasion resistance without decreasing of a strength of the main layer.

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