Avoiding the high-temperature decomposition and softening of (Al1−xTix)N coatings by the formation of stable superhard nc-(Al1−xTix)N/a-Si3N4 nanocomposite

Vepřek, S.; Männling, H.-D.; Jílek, Mojmír; Holubar, Pavel

doi:10.1016/j.msea.2003.08.052

Cited by 174 publications

(56 citation statements)

References 22 publications

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“…At 1100 ºC, peaks of the coating, substrate, aluminium oxide (corundum), h-(AlN) and cubic cobalt were identified. The diffusion of cobalt from the substrate into these kinds of coatings at temperatures around 1100 ºC, leading to the formation of Co 2 (Ti, Al) alloys has been reported [2]. Nevertheless, our pattern only shows cobalt in the fcc crystal structure.…”

Section: Microstructural Characterisation After Annealing In Argonmentioning

confidence: 50%

“…The decomposition of the fcc-AlTiN is produced via the formation of the cubic fcc AlN phase by spinodal mechanism, which leads to a small increase of the hardness. Upon further annealing, the fcc-AlN transforms to the stable Würtzite h-(AlN) [2].…”

Section: Microstructural Characterisation After Annealing In Argonmentioning

confidence: 99%

“…Ternary nitride coatings, such as AlTiN and AlCrN, have been investigated in different thermal treatment conditions, mainly in air and vacuum conditions, where its behaviour is outstanding. In air atmosphere, AlTiN and AlCrN present high oxidation resistance up to 800 ºC [2] and 900 ºC [3], respectively. In both cases, the aluminium and chromium oxide films are expected to be thermal barriers as well as lubricating layers, which can improve the cutting performance.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Silicon Addition on Microstructure and Mechanical Properties of Chromium and Titanium Based Coatings

Ardila-Téllez¹,

Sanchez

Téllez

2014

Fac. Ing.

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<p>The changes in the microstructure, mechanical properties and residual stresses of AlTiN, AlTiSiN, AlCrN and AlCrSiN coatings, has been studied before and after annealing at 900 ºC and 1100 ºC, using scanning and transmission electron microscopy, along with nano-indentation and X-ray diffraction techniques. The As-deposited coatings show a columnar structure, with a crystallite size between 18 nm and 28 nm. Despite the silicon addition, no effect on the crystallite size refinement was observed.<br />However, the addition of silicon increases hardness, elastic modulus and compressive residual stresses. After annealing at 900 ºC, the crystallite size growth and the residual stress relaxes; therefore, the coating hardness decreases. At 1100 ºC, the oxide layers formed in AlTiN and AlTiSiN, which act as protective layers enhancing oxidation resistance; meanwhile, a complete oxidation of AlCrN and AlCrSiN coatings take place. The Titanium based coatings present some superior mechanical properties and oxidation resistance than the chromium based coatings at 900 ºC and 1100 ºC.</p>

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Section: Microstructural Characterisation After Annealing In Argonmentioning

confidence: 50%

Section: Microstructural Characterisation After Annealing In Argonmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Silicon Addition on Microstructure and Mechanical Properties of Chromium and Titanium Based Coatings

Ardila-Téllez¹,

Sanchez

Téllez

2014

Fac. Ing.

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“…Therefore, the development of hard coatings was mostly focused on the improvement in their hardness [7,100,101] and thermal and oxidation stability [47,[102][103][104][105][106], as well as on the reduction of their thermal conductivity [47,95,[107][108][109]. A few categories of nanocomposite coatings are used most widely for cutting tools applications [2, 27, 89-93, 96, 110-112]: (i) designed as a combination of various compounds synthesized during coating deposition, such as TiN and AlTiN or AlCrN/Si 3 N 4 [47,113,114], as well as TiN/c-BN coatings [97,98,115]; (ii) formed as a result of annealing (for example of AlTiN coating with a high Al content of ∼ 65 at%) [2,[102][103][104][105][106]116].…”

Section: Nanocomposite Hard Coatingsmentioning

confidence: 99%

Hierarchical adaptive nanostructured PVD coatings for extreme tribological applications: the quest for nonequilibrium states and emergent behavior

Fox-Rabinovich

Yamamoto

Beake

et al. 2012

Science and Technology of Advanced Materials

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Adaptive wear-resistant coatings produced by physical vapor deposition (PVD) are a relatively new generation of coatings which are attracting attention in the development of nanostructured materials for extreme tribological applications. An excellent example of such extreme operating conditions is high performance machining of hard-to-cut materials. The adaptive characteristics of such coatings develop fully during interaction with the severe environment. Modern adaptive coatings could be regarded as hierarchical surface-engineered nanostructural materials. They exhibit dynamic hierarchy on two major structural scales: (a) nanoscale surface layers of protective tribofilms generated during friction and (b) an underlying nano/microscaled layer. The tribofilms are responsible for some critical nanoscale effects that strongly impact the wear resistance of adaptive coatings. A new direction in nanomaterial research is discussed: compositional and microstructural optimization of the dynamically regenerating nanoscaled tribofilms on the surface of the adaptive coatings during friction. In this review we demonstrate the correlation between the microstructure, physical, chemical and micromechanical properties of hard coatings in their dynamic interaction (adaptation) with environment and the involvement of complex natural processes associated with self-organization during friction. Major physical, chemical and mechanical characteristics of the adaptive coating, which play a significant role in its operating properties, such as enhanced mass transfer, and the ability of the layer to provide dissipation and accumulation of frictional energy during operation are presented as well. Strategies for adaptive nanostructural coating Topical Review design that enhance beneficial natural processes are outlined. The coatings exhibit emergent behavior during operation when their improved features work as a whole. In this way, as higher-ordered systems, they achieve multifunctionality and high wear resistance under extreme tribological conditions.

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“…In particular TiN-SiN x has become a model system in the field, 1,2 which may be extended to more complex multicomponent nitrides by, for example, Al and Cr addition in TiAlSiN 3,4 and CrAlSiN. 5 Due to the extreme immiscibility of Si 3 N 4 in TiN, solid solutions are typically not formed to a considerable extent during vapor deposition thin film growth.…”

Section: Introductionmentioning

confidence: 99%

First-principles study of the SiNx/TiN(001) interface

et al. 2012

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The structure of the SiN x tissue phase in superhard TiN/SiN x nanocomposites has been debated in the literature. We present a theoretical investigation of the possibility of crystalline and coherent (001) interfaces that satisfies the two necessary criteria, stability with respect to lattice vibrations as well as to variations in stoichiometry. It is found that one monolayer of Si tetrahedrally coordinated by N in a B3-like geometry embedded between B1-TiN(001) surfaces is both dynamically stable and thermodynamically stable with respect to vacancy formation. However, with increasing layer thickness the B3-type structure becomes unstable with respect to Si vacancy formation. Instead we suggest that a tetragonal D0 22 -like order of Si vacancies can stabilize the interface. These structures are in line with the experimental findings of the crystalline tissue phase which has coherent interfaces with TiN.

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Avoiding the high-temperature decomposition and softening of (Al1−xTix)N coatings by the formation of stable superhard nc-(Al1−xTix)N/a-Si3N4 nanocomposite

Cited by 174 publications

References 22 publications

Effect of Silicon Addition on Microstructure and Mechanical Properties of Chromium and Titanium Based Coatings

Effect of Silicon Addition on Microstructure and Mechanical Properties of Chromium and Titanium Based Coatings

Hierarchical adaptive nanostructured PVD coatings for extreme tribological applications: the quest for nonequilibrium states and emergent behavior

First-principles study of the SiNx/TiN(001) interface

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