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U. Eritt
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Proceedings Papers
ITSC1999, Thermal Spray 1999: Proceedings from the United Thermal Spray Conference, 777-782, March 17–19, 1999,
Abstract
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In this paper, a comprehensive mathematical model is developed for the integrated simulation of the coating plasma spraying process under low pressure. This simulation models powder particles that are heated and moved in a plasma jet, the heat transfer in the "coating substrate" system, and the formation of thermal loads. Basic software is developed for the practical implementation of the model. The process of alumina spraying is simulated. Paper includes a German-language abstract.
Proceedings Papers
ITSC1998, Thermal Spray 1998: Proceedings from the International Thermal Spray Conference, 367-372, May 25–29, 1998,
Abstract
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During the formation of coating systems we find strong temperature gradients within the coating-substrate system resulting in thermally induced stresses in the coating after the spraying process. The purpose of this investigation is to develop numerical tools which provide insight into the relationship between coating parameters and the thermomechanical response of the produced composite. Transient finite element modelling is applied to calculate temperature and stress histories in thermally sprayed coatings due to the deposition process. Two different models with different levels of complexity have been developed to investigate the spraying process on a macroscopic and on a microscopic scale. Experimental investigations of the temperature history during spraying in the substrate have been carried out to determine boundary conditions for the mathematical model and to enable a verification of the obtained results.
Proceedings Papers
ITSC1998, Thermal Spray 1998: Proceedings from the International Thermal Spray Conference, 425-429, May 25–29, 1998,
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The main purpose of this work is the development of mathematical and computer models for the integrated simulation of all stages of the atmospheric plasma spraying process (APS) with temperature dependent thermophysical and mechanical properties of the used materials and gases and experimental verification of the simulated results. The following mathematical models of APS were created: particle heating and movement in the plasma jet; coating structure formation; heat transfer and residual stresses in the coating-substrate system. The computer realization of these models enables us to model all stages of APS (integrated or separately). Databases of coating, substrate and plasma-gas substances include the temperature dependent properties. The model of APS is divided in 3 parts, which are connected by continuous data interface. Two dimensional approximation of plasma-gas velocity and temperature in the free plasma jet was used for computation of particle velocity, trajectory and temperature. This information was created with a special Graphic program module and included in database. Computer experiments for plasma spraying of Ah03 and ZrO 2 +8%Y 2 O 3 in Ar/H 2 plasma were carried out. The experimental verification of developed models with High-Velocity-Pyrometry (HVP) and Laser-Doppler-Anemometry (LDA) have shown the satisfactory precision of simulated results.