Textured alumina layer
AssigneeSeco Tools AB
InventorsTommy Larsson, Mats Johansson
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Abstract
A cutting tool insert for machining by chip removal comprising a body of a hard alloy of cemented carbide, cermet, ceramics or cubic boron nitride based material onto which a hard and wear resistant coating is deposited by CVD, and the methods of making and using the same. The coating includes at least one α-Al2O3 layer with a thickness between 0.5 μm and 40 μm having a {01-15} and/or {10-15} texture exhibiting excellent wear and metal cutting performance.
Claims12
Cutting tool insert for machining by chip removal comprising a body of a hard alloy of cemented carbide, cermet, ceramics or cubic boron nitride based material onto which a hard and wear resistant coating is deposited by CVD comprising at least one α-Al2O3 layer with a thickness between 0.5 μm and 40 μm characterised in that said α-Al2O3 layer is {01-15} and/or {10-15} textured.
Method of making a cutting tool insert comprising a body of cemented carbide, cermet, ceramics or cubic boron nitride based material onto which a hard and wear resistant coating is deposited comprising at least one α-Al2O3 layer by chemical vapour deposition at a temperature between 950° C. and 1050° C. in mixed H2, CO2, CO, H2S, HCl and AlCl3 at a gas pressure between 50 and 150 mbar characterised in that the CO2/CO gas flow ratio is cyclically varied, upwards and downward, continuously or stepwise between a lower gas flow ratio of 0.3≦(CO2/CO)|low≦1.2 and a higher gas flow ratio of 1.8≦(CO2/CO)|high≦3.0 with a periodicity between 1 minute and 60 minutes, preferably between 2 minutes and 30 minutes.
Dependencies are inferred from the claim text.