Oxidation behavior of titanium-aluminium nitrides

Joshi, A.; Hu, H. S.

doi:10.1016/0257-8972(95)02566-9

Cited by 68 publications

(25 citation statements)

References 21 publications

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“…Moreover, during the high temperature oxidation, the surface layer serves as the interface between the coating and ambient atmosphere where the mixing process of O and the coating's elements occurs. On the other hand, it is well known, that Al diffusion rate in Al 2 O 3 at 900°C is higher than that of O [58], so it is likely that Al diffuses through the Al 2 O 3 as well and oxidizes near the free surface, whereas diffusivity of Ti in alumina is very low. Thus, due to the Al 2 O 3 overgrowth, Ti, B, and N containing bonds give low contribution to the intensity of the signals.…”

Section: Xps Studiesmentioning

confidence: 96%

High temperature behavior of functional TiAlBSiN nanocomposite coatings

Pshyk

Coy

Nowaczyk

et al. 2016

Surface and Coatings Technology

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This article reports on the thorough characterization of structural-phase transformation in amorphous TiAlBSiN coating after high temperature annealing at 900°C in ambient air. The influence of annealing on the tribomechanical behavior of the coating at nano and micro scale was also examined. The research included multiple experimental techniques, i.e. AFM, SEM, TEM, HR-TEM, EDS, XPS and Raman spectroscopy. Experiments showed that the amorphous phase of the TiAlBSiN coating undergoes a structural transformation, evidenced in the changes of parameters such as topological and chemical short-range order after the post-deposition annealing at 900°C in air. The observed structural transformation, leads to a phase separation with the formation of a three dimensional nc-TiAl 3 /a-SiBN(O) nanocomposite structure. The relative increase of hardness, reduced elastic modulus, H/Er ratio and H 2 /E 3 r ratio after high temperature treatment of TiAlBSiN coatings is also reported. The complex interdependency between chemistry, morphology and relative composition of the amorphous TiAlBSiN coating phase, during the high temperature treatment, with the respective change of the tribo-mechanical characteristics, are evidence of the improvement of the coating properties in response to the environmental conditions and high temperature. This work contributes particularly to the development and understanding of flexible nanocomposite protective coatings and their changes at high temperature of operation.

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Section: Xps Studiesmentioning

confidence: 96%

High temperature behavior of functional TiAlBSiN nanocomposite coatings

Pshyk

Coy

Nowaczyk

et al. 2016

Surface and Coatings Technology

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“…The presence of Al in the coating leads to formation of a glassy alumina-oxide protective layer on the surface of coating, thus, increasing the tool resistance at high operating temperatures. [26] B. Work-Piece Materials Both alloys investigated in this study-Ti 15V 3Al 3Cr 3Sn (alloy A) and Ti 15V 3Al 3Cr 2Zr 0.9 La (alloy B)-have similar b-transus temperatures and can be age-hardened to more than 1100 MPa (UTS). The presence of strong b-stabilizing alloying elements, such as V and Cr as well as a-stabilizer Al renders alloys sensitive to solution and aging treatments.…”

Section: Methodsmentioning

confidence: 99%

Ti Alloy with Enhanced Machinability in UAT Turning

Maurotto

Siemers

Muhammad

et al. 2014

Metall Mater Trans A

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Metastable b-titanium alloys such as Ti 15V 3Al 3Cr 3Sn are of great technological interest thanks to their high fatigue strength-to-density ratio. However, their high hardness and poor machinability increase machining costs. Additionally, formation of undesirable long chips increases the machining time. To address those issues, a metastable b-titanium alloy (Ti 15V 3Al 3Cr 2Zr 0.9La) with enhanced machinability was developed to produce short chips even at low cutting speeds. A hybrid ultrasonically assisted machining technique, known to reduce cutting forces, was employed in this study. Cutting force components and surface quality of the finished work-pieces were analyzed for a range of cutting speeds in comparison with those for more traditional Ti 15V 3Al 3Cr 3Sn. The novel alloy demonstrated slightly improved machining characteristics at higher cutting speeds and is now ready for industrial applications.

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Section: Annealed Crtan Coatingsmentioning

confidence: 84%

“…A high (O+ N)/(Cr + Ta) ratio of up to 1.31-1.51 was achieved for the 8 h-annealed CrTaN coatings with a Cr/(Cr + Ta) ratio ranging from 0.59 to 0.61, which was attributed to [35][36][37]. The oxidation mechanisms for (Ti,Al)N coatings were proposed by Joshi and Hu [37]. A layered Al 2 O 3 /TiO 2 /nitride structure formed as the (Ti 0.5 ,Al 0.5 )N coatings were annealed in air at temperatures of approximately 800°C and higher; the formation was attributed to the rapid outward diffusion of Al in (Ti,Al)N and related oxides, which resulted in the growth of a protective Al 2 O 3 layer on the surface.…”

Section: Annealed Crtan Coatingsmentioning

confidence: 93%