Criteria for revealing structural changes in industrial glassware treated by electromagnetic fields
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2024-02-29 22:08
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SHARAGOV, Vasile, AGACHI, Mariana, OLARU, Ion. Criteria for revealing structural changes in industrial glassware treated by electromagnetic fields. In: Achievements and perspectives of modern chemistry, 9-11 octombrie 2019, Chişinău. Chisinau, Republic of Moldova: Tipografia Academiei de Ştiinţe a Moldovei, 2019, p. 144. ISBN 978-9975-62-428-2.
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Achievements and perspectives of modern chemistry 2019
Conferința "International Conference "Achievements and perspectives of modern chemistry""
Chişinău, Moldova, 9-11 octombrie 2019

Criteria for revealing structural changes in industrial glassware treated by electromagnetic fields


Pag. 144-144

Sharagov Vasile, Agachi Mariana, Olaru Ion
 
"Alecu Russo" State University of Balti
 
Disponibil în IBN: 7 noiembrie 2019


Rezumat

The effect of electromagnetic fields on molten glass and newly-formed hot industrial glassware has been studied to a lesser extent. To increase the mechanical strength of glass containers in industrial conditions, Bulgarian scientists resorted totreatment with electromagnetic fields [1-2]. Depending on the regime of thermomagnetic treatment, the minimum mechanical strength of bottles increased by 1.5-2 times. The aim of the undertaken experiments was to develop the criteria necessary to reveal the structural changes in industrial glassware for different purposes subjected to treatment with electromagnetic fields. Objects of experiment were containers (jars, bottles and flasks) of transparent colorless glass, bottles and flasks of green glass, illuminating and assorted glassware made from transparent colorless and milk glasses,ampoules made from medical glassand samples of sheet glass.The samples of glass and glassware were exposed to constant, alternating and pulsed magnetic fields. Thermomagnetic treatment of glass samples was conducted in laboratory and industrial conditions. Parameters of thermomagnetic treatment of glass samples in laboratory conditions are: value of vector’s magnitude of the magnetic induction - up to 0.15 T, temperature – between 300 and 600oC, duration – between 1 and 300 s. The main regimes of magnetic treatment of the newly-formed glass containers in industrial conditions are: temperature – between 500 and 550oC, the value of vector’s magnitude of magnetic induction – up to 0.22 T, duration – between 1 and 4 s. Jars, bottles and flasks were subjected to the influence of magnetic fields just after molding being transported into lehrs. Glass containers subjected to treatment did not require any special caution measures. On the basis of the experiments performed, the following criteria to reveal structural changes in industrial glassware for different purposes, treated with electromagnetic fields have been identified: 1) reducing the etching rate with a HF solution of glass samples subjected to thermomagnetic treatment; 2) increasing the microhardness and mechanical strength of glass after thermomagnetic treatment. With the increase of temperature, the value of vector’s magnitude of the magnetic induction, the duration of thermomagnetic treatment, the resistance of industrial glasses to the effects of HF solution, as well as their microhardness and mechanical strength increase.