Nitrided Engine Valve with HVOF Coating
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United States of America Patent
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Issued Date -
Apr 7, 2016
app pub date -
Oct 6, 2014
filing date -
Oct 6, 2014
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A valve for use in an internal combustion engine is disclosed. The valve includes a stem connected to a fillet disposed between the stem and a seat face. A thermal spray technique, such as a high velocity oxy fuel coating spray (HVOF) is applied to the seat face. A nitriding treatment that includes a nitrogen source, which may or may not contain carbon, and heat may be applied after the HVOF spray. The heat allows the nitrogen and/or carbon to penetrate the HVOF layer and the seat face to form a compound zone. The compound zone enhances the wear resistance of the surface during engine operation.
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