S.P 19 Mechanical properties of industrial glassware after action of the impulse magnetic field
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SHARAGOV, Vasile, OLARU, Ion, BOTEZATU, Vitalie, LYSENKO, Galina, AZARENCO, Olga. S.P 19 Mechanical properties of industrial glassware after action of the impulse magnetic field. In: Materials Science and Condensed Matter Physics, 13-17 septembrie 2010, Chișinău. Chișinău, Republica Moldova: Institutul de Fizică Aplicată, 2010, Editia 5, p. 295.
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Materials Science and Condensed Matter Physics
Editia 5, 2010
Conferința "Materials Science and Condensed Matter Physics"
Chișinău, Moldova, 13-17 septembrie 2010

S.P 19 Mechanical properties of industrial glassware after action of the impulse magnetic field


Pag. 295-295

Sharagov Vasile, Olaru Ion, Botezatu Vitalie, Lysenko Galina, Azarenco Olga
 
"Alecu Russo" State University of Balti
 
 
Disponibil în IBN: 22 aprilie 2021


Rezumat

The main disadvantage of the majority of types of glass is its low mechanical strength. During the recent years the demand for some types of glass (containers, assorted ware, illuminating articles, tubes, etc.) has fallen, because of their low mechanical strength. Besides, low mechanical strength leads to great production losses during the production stage, transportation and exploitation. Special methods of surface treatment (ion exchange, various types of coating, etching in hydrofluoric acid, dealkalization by acid gases and others) have been worked out for glass strengthening [1, 2]. But such kind of approach is not always effective for mass production of glassware. The aim of presented work was to investigate the influence of impulse magnetic field on mechanical characteristics of industrial glassware. As objects of investigation sheet glass, jars and bottles of colourless glass and bottles of green glass were used. Glass containers are made using sectional glass-forming machines (IS-8-2, AL106-2). Experiments on the thermo-magnetic treatment of glassware were held in laboratory and industrial conditions. Parameters of treatment of glass samples in laboratory conditions: value of vector’s magnitude of the magnetic induction - up to 0.15 T, temperature – between 300 and 600 oC, duration – between 1 and 300 s. The procedure of treatment of glass by magnetic field in laboratory conditions is the following. After the annealing glassware was broken and some flat pieces were picked up. Treatment of samples in the impulse magnetic field was held in inductors of different types. The kiln with samples of glass was introduced into the inductor at room temperature. Then the temperature was raised to the designed, heating was stopped and treatment by constant magnetic field was held. After the treatment samples were cooled in a closed kiln up to the room temperature. Microhardness of laboratory samples was measured. The value of microhardness was measured by the microhardness meter PMT-3M. The load on the indenter of the diamond pyramid Vickers made 0.5 N. The relative error of determination of microhardness did not exceed ± 4 %. The main regimes of the thermo-magnetic treatment of glass containers in industrial conditions were the following: temperature – between 500 and 550 oC, the value of vector’s magnitude of the magnetic induction – up to 0.25 T, duration – between 1 and 4 s. Jars and bottles were subjected to the effect of magnetic fields just after molding at transportation them into lehrs. There had not been taken any special precautionary measures with the treated glass containers. Mechanical properties of glassware were characterized by resistance to internal hydrostatic pressure, resistance on the compression in the direction perpendicular to the body walls and microhardness. The pressure had been risen until the glassware was broken. The absolute error of measuring of pressure didn’t exceed ± 0.01 MPa. Not less than 20 glassware were used for each treatment regime. Additionally the jars were tested on the resistance of the compression in the directions both along and perpendicular to the body walls. Loading speed was 20 mm/min using the press UMM-5. The jars were placed between support plates of press, the joint line being aligned always at the same position. The absolute error of measuring was ± 10 N. The number of jars used for testing in one experiment was not less than 20. To obtain comparable results the jars were taken up from the same form of glass-forming machine. Primarily influence of impulse magnetic field on microhardness of industrial glasses has been investigated. It has been established that with elevation of temperature, of value of vector’s magnitude of the magnetic induction and duration of thermo-magnetic treatment in laboratory conditions microhardness of all types of glass grows up. Increment of microhardness of industrial glasses after the effect of magnetic field makes from 10 to 20 %. Thermo-magnetic treatment of jars and bottles in industrial conditions increases their mechanical strength up to 40 % and microhardness up to 15 %. The main merits of the method of electromagnetic treatment of glass are: the possibility of strengthening the glassware of any form at the stage of their manufacturing. Technology of manufacturing the glassware does not change and sanitary conditions of work do not impair.