Publication

Strengthening mechanisms and thermal stability of arc deposited nanostructured TiAlN-based thin films

2004
Theses

Abstract

Titanium aluminium nitride (TiAlN)-based coatings are designed specially for applications where oxidation and wear resistance are primary demands, as in the case of cutting tools. Moreover the coatings are required to be thermally stable as well as have good "hot" hardness and fracture toughness for temperatures around 1000°C. Once these requirements are fulfilled, improved wear resistance is expected for standing extremely high shear forces developed on the tool rake face during high speed machining (HSM) in dry conditions. HSM also requires good shock resistance of coatings particularly demanding at the first second of the cutting process when the tool temperature has not reached "high temperature enhanced" plasticity. In this work, nanocrystalline films have been found to better respond to the complex paradox of conciliating high wear resistance with high fracture toughness. The synthesis of nanostructures with elevated mechanical properties became possible by using ultra high vacuum (UHV) deposition technologies such as cathode arc deposition. Compared to sputtering, for the same deposition conditions, arc permits to increase the average energy of particles extracted from the cathode. Moreover physical vapour deposition (PVD) techniques (Arc and Sputtering) permit to have good adherent coatings deposited at low temperature (

Official source

2004
Theses

Abstract

Official source

Related concepts (32)

Physical vapor deposition

Physical vapor deposition (PVD), sometimes called physical vapor transport (PVT), describes a variety of vacuum deposition methods which can be used to produce thin films and coatings on substrates including metals, ceramics, glass, and polymers. PVD is characterized by a process in which the material transitions from a condensed phase to a vapor phase and then back to a thin film condensed phase. The most common PVD processes are sputtering and evaporation.

Grain boundary strengthening

In materials science, grain-boundary strengthening (or Hall–Petch strengthening) is a method of strengthening materials by changing their average crystallite (grain) size. It is based on the observation that grain boundaries are insurmountable borders for dislocations and that the number of dislocations within a grain has an effect on how stress builds up in the adjacent grain, which will eventually activate dislocation sources and thus enabling deformation in the neighbouring grain as well.

Coating

A coating is a covering that is applied to the surface of an object, usually referred to as the substrate. The purpose of applying the coating may be decorative, functional, or both. Coatings may be applied as liquids, gases or solids e.g. Powder coatings. Paints and lacquers are coatings that mostly have dual uses of protecting the substrate and being decorative, although some artists paints are only for decoration, and the paint on large industrial pipes is for preventing corrosion and identification e.g.

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