At the Kielce University of Technology, work has been undertaken to create new porous coatings for heating surfaces. It was assumed that sintering copper powder with the addition of copper oxide powder in an atmosphere of dissociated ammonia would result in the formation of diffusion-derived pores, which should lead to the development of the surface area within the structure and provide additional nucleation sites.The primary technology for manufacturing the structures is the sintering of copper powders with copper oxide powder of varying particle sizes. The second proposed technology is the application of coatings using the electrolytic method. The results of metallographic studies and the influence of the structural parameters of the coatings produced in this way on heat transfer during boiling are presented. For the sintered structure, a significant intensification of heat transfer during boiling was obtained.
MICROSTRUCTURE AND PROPERTIES OF STELLIT LAYERS CREATED BY THE ELECTROSPARKDEPOSITION TECHNOLOGY
In the paper the authors present the results of studies of boiling heat transfer on sintered and galvted, porous structures. It was assumed that hydrogen atmosphere sintering of copper powder with an ition of cuprous oxide powder will result in the formation of diffusive pores, which should lead to Irface extension inside the structure and a generation of new nucleation sites. Sintering of copper powders with different amounts of copper oxide added to them is the basic technology for structure generation. The paper discusses results of metallographic analysis the effect of prepared covering structural parameters on boiling heat transfer. (…)
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Source: Logistyka Magazine