New coating systems for temperature monitoring in turning processes

Biermann, Dirk; Kirschner, M.; Pantke, Klaus; Tillmann, Wolfgang; Herper, Jan

doi:10.1016/j.surfcoat.2012.08.086

Cited by 22 publications

(12 citation statements)

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“…The temperatures of cutting tool during the turning process has been measured using various methods including thermocouples/pyrometer [151] or depositing a temperature sensor coating on the tool [153,154]. Norrby et al [82] used an infrared (IR) CCD camera to map the temperature distribution on a cutting insert and found that it increases with cutting speed [155].…”

Section: Stress/temperature Distributionmentioning

confidence: 99%

Mechanical and thermal stability of hard nitride coatings

Chen

2018

Linköping Studies in Science and Technology. Dissertations

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Section: Stress/temperature Distributionmentioning

confidence: 99%

Mechanical and thermal stability of hard nitride coatings

Chen

2018

Linköping Studies in Science and Technology. Dissertations

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“…Some of the methods include the use of thermocouples [134], sensors deposited on the tools [135,136], pyrometers [137] and modeling [138]. In this work, a near infrared CCD detector [139][140][141] was used due to its high resolution (μm) and ability to extract a temperature profile along the rake face.…”

Section: Temperature Distributionmentioning

confidence: 99%

Microstructural evolution of TiAlN hard coatings at elevated pressures and temperatures

Norrby¹

2014

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LINKÖPING 2014The cover image shows nine two-dimensional x-ray diffractograms of TiAlN merged into one quarter circle. Going counterclockwise from an as-deposited sample, the parts show different stages of annealing. The color scheme is chosen to represent the motto "Stort hjärta, hårt arbete".Niklas Norrby, unless otherwise stated ISBN: 978-91-7519-372-4 ISSN: 0345-7524 Printed by LiU-Tryck, Linköping, Sweden, 2014 i Abstract A typical hard coating on metal cutting inserts used in for example turning, milling or drilling operations is TiAlN. At elevated temperatures, TiAlN exhibits a well characterized spinodal decomposition into coherent cubic TiN and AlN rich domains, which is followed by a transformation from cubic to hexagonal AlN. Using in-situ synchrotron x-ray radiation, the kinetics of the second transformation was investigated in this thesis and the strong temperature dependence on the transformation rate indicated a diffusion based nucleation and growth mechanism. The results gave additional information regarding activation energy of the transformation and the critical wavelength of the cubic domains at the onset of hexagonal AlN. After nucleation and growth, the hexagonal domains showed a striking resemblance with the preexisting cubic AlN microstructure.During metal cutting, the tool protecting coating is subjected to temperatures of ~900 ºC and pressure levels in the GPa range. The results in this thesis have shown a twofold effect of the pressure on the decomposition steps. Firstly, the spinodal decomposition was promoted by the applied pressure during metal cutting which was shown by comparisons with annealed samples at similar temperatures. Secondly, the detrimental transformation from cubic to hexagonal AlN was shown to be suppressed at elevated hydrostatic pressures. A theoretical pressure/temperature phase diagram, validated with experimental results, also showed suppression of hexagonal AlN by an increased temperature at elevated pressures.The spinodal decomposition during annealing and metal cutting was in this work also shown to be strongly affected by the elastic anisotropy of TiAlN, where the phase separation was aligned along the elastically softer <100> directions in the crystal. The presence of the anisotropic microstructure enhanced the mechanical properties compared to the isotropic case, mainly due to a shorter distance between the c-AlN and c-TiN domains in the anisotropic case. Further improvement of the metal cutting behavior ii was realized by depositing individual layers with an alternating bias. The individual bias layers exhibited microstructural differences with different residual stress states. The results of the metal cutting tests showed an enhanced wear resistance in terms of both crater and flank wear compared to coatings deposited with a fixed bias.iii Populärvetenskaplig sammanfattningI den här avhandlingen presenteras forskningsresultat på en keramisk beläggning, TiAlN (titanaluminiumnitrid), som ligger som ett skyddande skikt på svarvskär. Tjockleken på beläggni...

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“…However, there is also a need for thin film thermocouples in production processes. Therefore, different thin film thermocouples are currently developed for several applications, such as welding [5] or metal [6][7][8][9] and polymer processing [10,11]. However, the thin film thermocouples must be adapted to the respective application fields.…”

Section: Introductionmentioning

confidence: 99%

“…According to DIN EN 60584, eight different thermocouple pairs are available, whereas Fe-CuNi [12], Cu-CuNi [13], NiCr-Ni [6][7][8][9] and Pt-10%Rh/Pt [14] are the most reported thin film thermocouples deposited by means of PVD. Apart from the standardized thermocouples, TiC-TaC [15], Al-Au [11], Ni-Cu [12,16], Ni-Fe [12], Cu-Fe [12], Chromel-Alumel [5,12], and Pt-Pd [4] thin film thermocouples are synthesized.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, depending on the application, the thin film thermocouples need to be protected against wear or oxidation processes by means of a suitable tribological cover layer. To enhance the wear resistance of thin film sensors, protection layers consisting of Al 2 O 3 [7,14,16,17], AlN [17], or TiN [8,18] are mainly used. For electrical isolation purposes, HfO 2 [6] and Al 2 O 3 [16] layers are utilized.…”

Section: Introductionmentioning

confidence: 99%

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Combining Thermal Spraying and Magnetron Sputtering for the Development of Ni/Ni-20Cr Thin Film Thermocouples for Plastic Flat Film Extrusion Processes

et al. 2019

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In the digitalization of production, temperature determination is playing an increasingly important role. Thermal spraying and magnetron sputtering were combined for the development of Ni/Ni-20Cr thin film thermocouples for plastic flat film extrusion processes. On the thermally sprayed insulation layer, AlN and BCN thin films were deposited and analyzed regarding their structural properties and the interaction between the plastic melt and the surfaces using Ball-on-Disc experiments and High-Pressure Capillary Rheometer. A modular tool, containing the deposited Ni/Ni-20Cr thin film thermocouple, was developed and analyzed in a real flat film extrusion process. When calibrating the thin film thermocouple, an accurate temperature determination of the flowing melt was achieved. Industrial type K sensors were used as reference. In addition, PP foils were produced without affecting the surface quality by using thin film thermocouples.

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New coating systems for temperature monitoring in turning processes

Cited by 22 publications

References 2 publications

Mechanical and thermal stability of hard nitride coatings

Mechanical and thermal stability of hard nitride coatings

Microstructural evolution of TiAlN hard coatings at elevated pressures and temperatures

Combining Thermal Spraying and Magnetron Sputtering for the Development of Ni/Ni-20Cr Thin Film Thermocouples for Plastic Flat Film Extrusion Processes

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