Hardness
The high surface hardness provided by the aluminum knife coating from a titanium plating manufacturer is one method to extend service life. Generally, the higher the hardness of the material or surface, the longer the service life. Aluminum knife coatings with titanium nitride have greater hardness than nitride coatings. With the addition of carbon content, the hardness of the coating is increased by 33%, with an approximate hardness range of Hv3000 to 4000 (depending on the manufacturer). The use of CVD diamond coatings with a surface hardness up to Hv9000 is already quite mature, and compared to tool coatings, the service life of CVD diamond coated tools is extended 10 to 20 times. The high hardness and cutting speed of diamond coatings, which can improve the ability by 2 to 3 times compared to uncoated tools, make them a good choice for machining non-ferrous materials.

Wear resistance
Wear resistance refers to the coating's ability to withstand abrasion. Even though the material of certain workpieces may not be particularly hard, elements added during the production process and the chosen techniques might cause the cutting edges to chip or become dull.

Common coating stacking methods for wear-resistant coatings on molds include Physical Vapor Deposition (PVD) and Chemical Vapor Deposition (CVD). Typically, PVD coatings are about 2 to 6 micrometers thick and apply a compressive stress to the tool coating substrate; while CVD coatings, also about 2 to 6 micrometers thick, apply a tensile stress to the blade substrate. The former is more beneficial for enhancing the substrate's strength.

Surface smoothness
High coefficient of friction adds cutting heat, which can shorten the lifespan of the coating and even cause it to fail. Reducing the coefficient of friction can extend the lifespan. A smooth or texture-regular aluminum coated blade surface is beneficial in reducing cutting heat, as a smooth surface allows chips to quickly slide off the leading edge, reducing heat generation. Compared to uncoated surfaces, coatings with better surface smoothness can be processed at higher cutting speeds, further preventing high-temperature melting and welding with the workpiece material.
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