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Coating Performance Features With the increased demand for faster metal removal rates, the acceptance of coated product is advancing. The most proven coatings are TiN, TiCN and TiALN. Under the appropriate conditions, they will provide for an increase in production rates which ultimately lower cost. The key elements of the coating which impact the tool performance are:	Hardness Provides abrasion resistance. The higher the hardness, the more resistant the tool is to abrasion. Surface Roughness Provides enhanced chip flow. The smoother the finish, the better the chip flow and heat dissipation. Oxidation Temperature Provides the ability to withstand heat which causes the coating to break down. The higher the oxidation temperature, the more thermal resistance of the coating, which enables the tool to operate at higher metal removal rates.

How To Use Coatings

Coating Characteristics Coating Micro Hardness (HV 0.05) Coefficient of Friction Coating Thickness Max. Working Conditions Key Characteristics TiN 2700-3100 .4 – .5 2–4 microns 750° – 950° F Good general purpose coating TiCN 4100-4900 .3 – .4 2–4 microns 650° – 750° F High hardness, wear-resistance, enhanced toughness TiALN 4000-5000 .3 – .4 2–5 microns 1450° – 1650° F Excellent oxidation temperature Coating Selector Performance Material to be Machined Excellent   Very Good   Good   High alloy steels, low alloy steels, stainless steels at medium and high cutting speeds TiALN   TiCN   TiN   High alloy steels, low alloy steels, stainless steels at low cutting speeds TiCN   TiALN   TiN   Aluminum alloys, cast aluminum, grey cast iron, aluminum silicon alloys TiALN   TiCN   ——   Copper alloys, bronze, aluminum bronze, nickel-silver ——   ——   TiCN   Nickel, nickel alloys, hastelloy, inconel, titanium, titanium alloys TiALN   ——   ——   Copper alloys, bronze, aluminum bronze, nickel-silver ——   ——   TiALN