A thermal diagnostic for evaluating the performance of refractory coatings under a variety of heat loads is demonstrated. Heat flow through refractory coatings of TiC exposed to the edge plasma of Microtor II was measured using coated copper samples instrumented with thermocouples. Using interior temperature data, the inverse heat conduction problem was solved numerically to obtain the surface ...

Conventional and nanostructured YSZ coatings were deposited on the IN-738 Ni super alloy by the atmospheric plasma spray technique. The oxidation was measured at 1100°C in an atmospheric electrical furnace. According to the experimental results the nanostructured coatings showed a better oxidation resistance than the conventional ones. The improved oxidation resistance of the nanocoating could ...

Vertical carbon nanotube (CNT) forests bonded at room temperature with sprayed on nanoscale polymer coatings are found by measurement to produce thermal resistances that are on a par with those of conventional metallic solders. These results are achieved by reducing the high contact resistance at CNT tips, which has hindered the development of high performance thermal interface materials based ...

Nanophase (Ce, Zr, Pr)O2-doped alumina coatings were prepared by impregnating the cordierite ceramic honeycomb in the sol or in the slurry of already calcined powder, respectively. The effects of preparation methods on the crystal phase, texture, oxygen storage capacity (OSC), reducibility, surface morphology and thermal stability of coatings were investigated by X-ray diffraction (XRD), the Br...

Ceramic Thermal Barrier Coatings (TBCs) on superalloy components are being used successfully in land-based gas turbine and aircraft engines. These coatings are generally made by either air plasma spraying (APS) or electron beam physical vapour deposition (EB-PVD). In general, EB-PVD TBCs have superior durability due to the columnar structure, but they are very expensive compared to APS TBCs. EB...

Thermal fluctuations in the coatings used to make high reflectors are becoming significant noise sources in precision optical measurements and are particularly relevant to advanced gravitational-wave detectors. There are two recognized sources of coating thermal noise; mechanical loss and thermal dissipation. Thermal dissipation causes thermal fluctuations in the coating which produce noise via...

Attempts to increase the gas temperature within gas turbine engines are driving the development of thermal barrier coatings that reduce superalloy component oxidation rates by disrupting thermal transport processes. Novel metal–ceramic multilayer’s combining thin metal layers with low thermal conductivity oxide ceramics offer a potential approach for impeding both the radiative and conductive t...

The performance of a pyroelectric detector with a carbon multi-walled nanotube coating was evaluated in the 0.9 μm to 14 μm wavelength range. The relative spectral responsivity of this detector was shown to be flat over most of the wavelength range examined and the spectral flatness was shown to be comparable to the best infrared black coatings currently available. The performance of the detect...

Metallic coatings using thermal spraying techniques are widely applied to structural steels to protect infrastructure against corrosion and improve durability of the associated structures for longer service life. The thermal sprayed metallic coatings consisting of various metals, although have higher corrosion resistance, will still corrode in a long run and may also subject to corrosion induce...