Multilayered coated cutting tool

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United States of America Patent

PATENT NO 8409696
APP PUB NO 20110111197A1
SERIAL NO

12867889

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Abstract

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A cutting tool includes a body of a hard alloy of cemented carbide, cermet, ceramics, cubic boron nitride based material or high speed steel and on which at least one of the functioning parts of the surface thereof, a hard and wear resistant coating is applied. The coating includes a polycrystalline laminar, multilayered structure of metal nitride compounds, in a repetitive form . . . MeN/(Ti1-xAlx)N/MeN/(Ti1-xAlx)N/MeN/(Ti1-xAlx)N/MeN/(Ti1-xAlx)N . . . of cubic structured (Ti1-xAlx)N layers where 0.3MeN/d(Ti,Al)N)<1/3 and a thickness dMeN≧1 nm that is essentially constant throughout its total thickness up to 20 μm. The coating hardens as a nanocomposite, adapting its strength during spinodal decomposition of (Ti1-xAlx)N in cubic TiN and cubic AlN domains where the additional cubic structured MeN layers provides elements for locking a predominantly overall cubic coating structure thus suppressing the hexagonal AlN phase formation leading to improved high temperature metal cutting properties.

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Patent Owner(s)

Patent OwnerAddress
SECO TOOLS AB737 82 FAGERSTA

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Johansson, Mats Linkoping, SE 100 999
Knutsson, Axel Linkoping, SE 2 19
Odén, Magnus Tullinge, SE 4 12
Sjölén, Jacob Fagersta, SE 4 31

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