the presence of melting signature in the particle temperature distribution was observed, which has been confirmed by simulation and through independent experimental observation by Mauer et al. This study aims to estimate the molten content of the spray stream (as an ensemble) from experimental measurement of in-flight (individual) particle characteristics. The significance of assessing, monitoring, and controlling the molten content in spray stream on achieving an efficient process and reproducible coating characteristics and properties is known.
We are able to measure a strong seismoelectric current that correlates with porosity of the cores.Particle melting is one of the key issues in air plasma spray processing of high temperature ceramics such as Yttria Stabilized Zirconia (YSZ). These porous bodies have a very high hydrodynamic resistance that prevents measurement of the classical streaming current. The last tests were performed with cylindrical sandstone cores. We were able to derive some conclusions about the dependence of the seismoelectric current on the pore size. Nevertheless, we measured a strong signal, which was apparently associated with the pores of the particles. According to classical theory, these glass particles are not supposed to generate any electroacoustic signal because colloid vibration current decays with increasing particle size due to the particles inertia. The second type of porous body was again a deposit, but instead of solid submicrometer particles, we used very large, porous glass spheres. We were also able to extract information about the porosity of the forming deposits. It allowed us to unambiguously confirm that the measured signal was generated by the deposit. We monitored the kinetics of the deposit formation on the surface of the electroacoustic probe. The first porous body was a deposit of solid submicrometer particles. We demonstrated such measurements of the seismoelectric current with electroacoustic devices in three different types of porous bodies. Such electroacoustic devices must first be calibrated with a liquid dispersion and then used to characterize a porous body. This electroacoustic effect is called the “seismoelectric current” the reverse process, when an electric field is the driving force, is called the “electroseismic current.” Seismoelectric currents can be measured with electroacoustic devices originally designed for characterizing liquid dispersions. Propagation of ultrasound through a porous body saturated with liquid generates an electric response.
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