Salt bath ferritic nitrocarburizing of brake rotors
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United States of America Patent
Stats
-
Oct 16, 2012
Grant Date -
Jan 3, 2008
app pub date -
Jun 29, 2006
filing date -
Jun 29, 2006
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Ferritic nitrocarburized surface treatment of cast iron brake rotors providing oxidation resistance, good braking performance and absence of distortion. Machined brake rotors are pre-heated, then immersed into a high temperature molten nitrocarburizing salt bath for a first predetermined dwell time. After removing the brake rotors from the nitrocarburizing salt bath, the brake rotors are directly immersed into an oxidizing salt bath at a lower temperature than the nitrocarburizing salt bath so that the brake rotors are thermally quenched. After a predetermined second dwell time in the oxidizing salt bath, the brake rotors are removed therefrom and further cooled to room temperature, either by water application thermal quenching or slow cooling in air. A fixture provides stable holding the brake rotors with a minimum of contact during placement in the salt baths.
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Patent Citation Ranking
- 6 Citation Count
- C23C Class
- 4.98 % this patent is cited more than
- 13 Age
