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Constant demand for more efficient turbine engines requires applying thermal barrier coatings (TBC) on the crucial engine components. However, one of the main problems encountered in designing new kinds of ceramic coatings intended for high temperature residential components is the residual stresses generated during the exploitation of these components at elevated temperatures. In the present work,...
The thermal shock behavior and microstructural investigation of CoNiCrAlYSi coatings applied by Low Vacuum Plasma Spray (LVPS) and High-Velocity Oxy Fuel (HVOF) techniques on the Ni-base superalloy IN738LC were examined. Thermal shock resistance was investigated by forced water quenching of coated samples from high temperature (1100°C) to room temperature. Thermal shock life time of coatings were...
Ni 60 Nb 20 Zr 20 glass composite coatings were successfully produced in a single step using gas tunnel type plasma spraying torch. The resultant phases and structures obtained were characterized using X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques, respectively. The sliding wear behavior of the developed metallic glass composite coatings was evaluated...
The CoNiCrAlYSi coatings were produced by using low vacuum plasma spray (LVPS) and high velocity oxy-fuel (HVOF) techniques on the Inconel-738. Hot corrosion behavior and microstructure characterization was investigated by exposing the sample to a molten film of Na 2 SO 4 -20٪ wt NaVO 3 at 880 °C for up to 560 h. The hot corrosion rate was determined by measuring the weight...
As one of the applications of high-energy type plasma to environmental problems, the treatment of carbon dioxide gas was studied, and the fundamental experiment was carried out by using a gas tunnel type plasma jet. In this paper, the results about the electrical characteristics of plasma torch and the thermal efficiency are shown. The thermal efficiency of the plasma torch was increased as the mixing...
The thermal barrier coatings (TBCs) by gas tunnel-type plasma spraying exhibited ceramic-composite features consisting of a host oxide matrix ceramic with an embedded second phase material. The densities of the composite TBC were found to be higher than those sprayed with 100wt% ZrO 2 or Al 2 O 3 . In the coatings produced with powder mixtures of 50wt%, the embedded splats...
Collaborative research between The University of Tennessee and Osaka University is directed toward the development of High Functionally Graded Materials (Vacuum 59(1) (2000) 194). Micro-composite coatings within the ZrO 2 -Al 2 O 3 system were fabricated by thermal spraying of material that was injected into the plasma using a hybrid technique (Functionally graded thermal sprayed...
By means of gas tunnel-type plasma spraying, a high-hardness zirconia coating could be obtained at a short spraying distance. For example, Vickers hardness of zirconia coating was H v =1050 at the spraying distance of L=30mm, when the power input was P=20kW. This high-hardness coating had a hardness layer near the surface. In this paper, the effect of heat treatment on the characteristic of...
A novel ZrO 2 -Al 2 O 3 thermal barrier composite coating was produced using a gas-tunnel-type plasma spraying torch. To enhance visualization of the microstructure features, image enhancement techniques were used during the microphotograph digitization processes. The unique microstructure features of this composite coating include a relatively even distribution of embedded...
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