Measurement of thermal diffusivity and anisotropy of plasma-sprayed coatings

Houlbert, A.S.; Cielo, P.; Moreau, Christian; Lamontagne, Mario

doi:10.1007/bf01563712

Cited by 16 publications

(9 citation statements)

References 23 publications

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“…To eliminate the machine broadening effect, Equation 1 was used to find the corrected peak width B , where b is the measured peak width and β is the machine broadening as determined from the peak width of a reference LaB6 single crystal. The thermal diffusivity of the coatings was measured at room temperature using the laser flash technique 27. In this method, a thermal pulse generated by a laser beam is applied on one face of the free‐standing coating of a 7 mm square and the temperature history on the opposite side is used for calculations of thermal diffusivity through the coating thickness.…”

Section: Methodsmentioning

confidence: 99%

High‐Temperature Performance of Alumina–Zirconia Composite Coatings Containing Amorphous Phases

Tarasi

Medraj

Dolatabadi

et al. 2011

Adv Funct Materials

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Amorphous phases are commonly found in nanostructured plasma‐sprayed coatings. Nonetheless, the role of these phases in the resulting coatings’ properties has remained uninvestigated until now. In the present work, pseudo‐eutectic coatings—based on alumina and 8 wt% yttria‐stabilized zirconia (YSZ)—containing amorphous phases are produced using a suspension‐plasma‐spray process. These composite materials are a potential choice for thermal‐barrier coating applications. The role of the amorphous phase on the performance of the coatings is investigated before and after heat treatment. Results show that, although the amorphous phases in untreated coatings reduce the thermal conductivity, they impair the mechanical properties. However, treatment above the crystallization temperature leads to better mechanical properties as well as enhanced high‐temperature stability of the resulting nanostructure. Moreover, the role of alumina as a stabilizer of high‐temperature YSZ phases (tetragonal and cubic) is confirmed and the high‐temperature phase stability of the alumina–YSZ composite is demonstrated. The amorphous phases are found to crystallize into their corresponding high‐temperature stable phases; i. e., α‐alumina and tetragonal zirconia.

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Section: Methodsmentioning

confidence: 99%

High‐Temperature Performance of Alumina–Zirconia Composite Coatings Containing Amorphous Phases

Tarasi

Medraj

Dolatabadi

et al. 2011

Adv Funct Materials

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“…The measurements were made on coatings that had been removed from the substrate. More details on how this technique can be employed to evaluate the thermal diffusivity of thermal spray coatings can be found elsewhere [13].…”

Section: Thermal Diffusivitymentioning

confidence: 99%

Nanostructured YSZ thermal barrier coatings engineered to counteract sintering effects

Lima

Marple

2008

Materials Science and Engineering: A

217

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“…The coated copper plates were further cut and used as specimens for microscopic analysis. The coatings formed on aluminium substrates were separated from the substrate by dissolving the aluminium in 40% KOH solution to obtain free-standing specimens for thermal diffusivity measurements by the laser flash method as explained in [25]. Thermal diffusivity values were converted to thermal conductivity based on the properties of pure Cu (ρ = 8900 kg m −3 ,…”

Section: Materials and Experimental Methodsmentioning

confidence: 99%

Effect of cathode microstructure on arc velocity and erosion rate of cold cathodes in magnetically rotated atmospheric pressure arcs

Rao¹,

Munz²

2008

J. Phys. D: Appl. Phys.

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Atmospheric pressure arc velocity and arc erosion measurements were performed on thermal sprayed copper cathodes having grain size distributions from submicrometre to a few micrometres in a continuous running arc system. Ultrahigh purity (UHP), 99.99% pure, argon and a mixture of UHP argon with 10% (volumetric) extra dry air were used as plasma forming gases. An external magnetic field of 0.10 T was used to rotate the arc which was operated at a constant power setting of 6 kW (150 A and 40 V). Cathodes having different microstructures were formed using high velocity oxygen fuel (HVOF) spraying and vacuum plasma spraying (VPS) methods with different annealing times. HVOF sprayed cathodes were tested for arc erosion and arc velocity in their as-sprayed state and also after annealing them at 300 and 600 °C for 1 and 8 h durations in an inert argon atmosphere. VPS sprayed coatings were tested as-sprayed. The effect of the initial coating thickness on erosion rates was investigated. Annealing HVOF coatings at 600 °C for 8 h produced near equi-axed grains with a 2–3 µm average size. These coatings showed 60% higher steady state arc velocities and up to 68% lower erosion rates compared with massive copper cathodes having a 20–23 µm average grain size. VPS coatings having a 0.9–1.5 µm average grain size gave up to 70% lower erosion rates when compared with massive copper cathodes. The results show a clear effect of the cathode microstructure on the arc velocity and the erosion rate.

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Measurement of thermal diffusivity and anisotropy of plasma-sprayed coatings

Cited by 16 publications

References 23 publications

High‐Temperature Performance of Alumina–Zirconia Composite Coatings Containing Amorphous Phases

High‐Temperature Performance of Alumina–Zirconia Composite Coatings Containing Amorphous Phases

Nanostructured YSZ thermal barrier coatings engineered to counteract sintering effects

Effect of cathode microstructure on arc velocity and erosion rate of cold cathodes in magnetically rotated atmospheric pressure arcs

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