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Change form of porous cast metals at plastic deformation

Journal: Bulletin of Prydniprovs'ka State Academy of Civil Engineering and Architecture (Vol.2019, No. 6)

Publication Date:

Authors : ;

Page : 77-84

Keywords : plastic deformation; porous cast metal; поглощательная ability; heat conductivity; cellular structure;

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The decision of a problem of transformation radiant energy in the thermal or electric is connected with necessity of application of new materials with high absorb ability and heat conductivity. Metals with a pure smooth surface have low values of degree of blackness and absorption abilities and, hence, high enough values of reflective ability. Special coverings and paints do not solve a problem because of decrease in heat conductivity and their degradation in due course. Application of porous cast metals and the alloys having cellular structure, considerably will increase the specific area of a surface of a design, and also will allow to carry out volume absorption of falling radiation. Purpose. Research laws change form of porous cast metals at plastic deformation for reception of the regulated structure and properties in design elements heat transfer devices. Results. It is experimentally established that change a thickness of partitions in porous cast metals in the course of deformation occurs according to laws change of an average thickness wall of a pipe at reduce. Porous cast metals at plastic deformation behave as a package of pipes in which deformation work is rather considerable as at axial, and radial loadings. At a proskating rink more intensive reduction of diameter a time and porosity in comparison with drawing is observed. Scientific novelty. It is shown that by means of plastic deformation of porous cast metals it is possible to operate their structure and physical properties, for example absorption and radiating abilities. Practical relevance. The received materials possess high absorption ability in a direction of orientation of a time. It promotes their wide application in absorbers of solar energy for solar collectors, radiators of refrigerators-radiators and other elements of a design of power installations. Use of porous cast metals in heat exchangers will sharply reduce metal consumption and will raise thermal efficiency of the unit.

Last modified: 2020-01-23 20:32:41