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Poster Session: Nanomaterial Coatings
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Proceedings Papers
ITSC2014, Thermal Spray 2014: Proceedings from the International Thermal Spray Conference, 866-873, May 21–23, 2014,
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Nanostructured WC-Co powders were cold sprayed on different substrate materials at different accelerating gas temperatures. Splat morphology and microstructure were examined, showing that the splats are partially embedded in plain carbon and stainless steel substrates with a contour similar to that of the feedstock powder. Gaps and revers were observed around the splats and corrugations or ripples were found on the surface. In contrast, splats on the surface of WC-Co substrates are relatively flat with ejectas on the periphery. A comparison of splats also shows that particle deformation increases with increasing gas temperature and substrate hardness.
Proceedings Papers
ITSC 2011, Thermal Spray 2011: Proceedings from the International Thermal Spray Conference, 1284-1294, September 27–29, 2011,
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Composite coatings of titanium powder were deposited on aluminium samples by using the cumulative-detonation equipment. Consumption of fuel mixture components (propane-oxygen-air) was up to 4.3 m 3 per kilo of a coating. The coatings were examined by scanning electron microscopy (SEM), transmission electron microscopy (TEM) with diffraction, X-ray phase analysis, hardness measurements, as well as plasticity and adhesion/cohesion resistance scratch tests. It is shown that the coatings are characterised by the presence of nanodispersed ceramic formations, and feature high values of plasticity, hardness and adhesion strength.
Proceedings Papers
ITSC 2011, Thermal Spray 2011: Proceedings from the International Thermal Spray Conference, 1295-1299, September 27–29, 2011,
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ZrOCl 2 •8H 2 O and NH 4 OH were regarded as original materials to prepare zirconia sol by co-precipitation, and nano-zirconia coatings were prepared by sol plasma spraying. The structure of the coatings was analyzed by SEM, XRD, and influence of power and stabilizer, concentration and dispersed phase on the coatings was investigated primarily. The result showed that the sol was non-crystal structure after spontaneously dried, the coatings were mixed of nanostructure of monoclinic and cubic phase after plasma jet heated. Increasing power decreased the content of non-crystal phase, adulterating yttria had good crystal phase stabilization, and the content of monoclinic phase decreased greatly. Coatings were denser when higher concentration and ethanol qua dispersed phase were used. Porosity of coatings decreased prior and increased later along with concentration increasing.
Proceedings Papers
ITSC 2011, Thermal Spray 2011: Proceedings from the International Thermal Spray Conference, 1300-1306, September 27–29, 2011,
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The manufacture of submicrometer-structured coatings by thermal spraying is subjected nowadays to increasing research efforts in order to obtain unique and often enhanced properties compared to conventional coatings. Injecting suspensions of submicron ceramic particles into the plasma jet or the flame enables to deposit finely-structured coatings. Such fine microstructures can be advantageous for applications in the field of thermal barrier coatings (TBCs) for gas turbines. Often, suspension plasma sprayed (SPS) TBCs show unique mechanical, thermal and optical properties compared to conventional atmospheric plasma sprayed (APS) TBCs. They have thus the potential of providing increased TBC performances under severe thermo-mechanical loading. Experimental results show the capability of SPS to obtain yttria-stabilized zirconia (YSZ) coatings with high density of vertical segmentation cracks, yielding high strain tolerance and low Young’s modulus, while the porosity is still large compared to APS segmented coatings. Besides, sintering behavior of complete TBC systems under a thermal gradient exposure is of high importance. The evolution of the coating microstructure during thermal cycling test at very high temperature (1400°C) in our burner rigs as well as under isothermal annealing and its effects on the coating properties such as Young’s modulus were investigated.
Proceedings Papers
ITSC 2011, Thermal Spray 2011: Proceedings from the International Thermal Spray Conference, 1307-1312, September 27–29, 2011,
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Liquid injection plasma spraying is of growing interest for thermal spray applications like thermal barrier coatings and solid oxide fuel cells, since finely structured coatings offer improved properties over conventionally spray ones, for example lower thermal diffusivity and higher catalytic activity. One challenge is the optimization and understanding of the injection process. With a new high speed shadowgraphy setup, the injection and atomization of individual drops was observed and described in detail in this work which is, to our best knowledge, not reported before. A drop atomization cone model is derived from observations. A new modelling approach is developed which allows the prediction of the drop atomization cones by analytical calculations. The simulations are compared to measurements and deviations are explained by neglected effects which will be included in further developments of this model.