Hard films - History

                 

With the rapid development of science and technology, mining continues to be a variety of extreme conditions, more and more difficult to machine materials, the development of metal-cutting technology, especially the emergence of high-speed cutting, dry machining and micro-lubrication of the cutting process.

Metal cutting tools made increasingly stringent technical requirements. Hard film coating can reduce friction and wear of the workpiece, effectively improve the surface hardness, toughness, wear resistance and high temperature stability, greatly improve the life of the coated product. Is being adapted to the requirements of modern high-tech manufacturing metal cutting tools, causing the tool material and performance changes, is considered to be a revolution in metal cutting tool technology history.

In addition, many used in the friction environment components, rigid film material can greatly improve their life, so hard film is widely used in different fields of machinery, electronics, metallurgy, automobile, aerospace, etc.

[1] on the surface properties of materials have become increasingly demanding, followed by R & D progress, various kinds of rigid films and a variety of synthetic hard film technology, but also increasingly reflect the surface technology as a new type of comprehensive discipline has a very high value. On the surface of the mechanical material properties, chemical properties and resistance to high temperature oxidation and corrosion resistance has many advantages on a hard film is particularly impressive. A hard film such as DLC, TiN, TiAlN, Al 2 O 3, MoS 2 - Ti etc. in order to improve the wear-resistant materials, corrosion resistance and high temperature properties and the layer material is applied to cover the surface of which is rigid film can significantly improve the durability of the components

[2]. From a technical point of view, a thickness of a few microns and below the cover layer is generally known as a hard film; overlay and even more commonly referred to several tens of microns thick, hard coating

[3], where the hard film has a wear-resistant, corrosion-resistant, high temperature oxidation, self-lubricating and other aspects of performance characteristics.