Stock material or miscellaneous articles – Composite – Of inorganic material
Reexamination Certificate
2004-04-26
2008-09-09
Turner, Archene (Department: 1794)
Stock material or miscellaneous articles
Composite
Of inorganic material
C051S307000, C051S309000, C428S325000, C428S336000, C428S697000, C428S699000
Reexamination Certificate
active
07422803
ABSTRACT:
Wear resistance of the prior-art Ti(C,N) layers can be considerably enhanced by optimising the grain size and microstructure. This invention describes a method to obtain controlled, fine, equiaxed grain morphology in Ti(C,N) layers produced using moderate temperature CVD (MTCVD). The control of the grain size and shape can be obtained by doping using CO, CO2, ZrCl4and AlCl3or combinations of these. Doping has to be controlled carefully in order to avoid nanograined structures and oxidisation. This kind of coatings shows new enhanced wear properties. The fine grain size together with equiaxed grain morphology enhances the toughness of the coating with at least maintained wear resistance, which can be seen especially in sticky steels like stainless steels. The optimum grain size is from about 50 to about 300 nm, preferably from about 50 to about 150. The coatings according to this invention are characterised by the lack of any strong preferred growth orientation, the length-to-width ratio (L/W) around 1 and only with a slight to moderate XRD line broadening.
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Drinker Biddle & Reath LLP
Seco Tools AB
Turner Archene
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