Factors affecting the mechanical strength of glass containers exposed to impulse magnetic field
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SHARAGOV, Vasile; AGACHI, Mariana; OLARU, Ion. Factors affecting the mechanical strength of glass containers exposed to impulse magnetic field. In: Materials Science and Condensed Matter Physics. Ediția a 9-a, 25-28 septembrie 2018, Chișinău. Chișinău, Republica Moldova: Institutul de Fizică Aplicată, 2018, p. 275.
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Materials Science and Condensed Matter Physics
Ediția a 9-a, 2018
Conferința "International Conference on Materials Science and Condensed Matter Physics"
Chișinău, Moldova, 25-28 septembrie 2018

Factors affecting the mechanical strength of glass containers exposed to impulse magnetic field


CZU: 539.2+661.11
Pag. 275-275

Sharagov Vasile, Agachi Mariana, Olaru Ion
 
Alecu Russo Bălţi State University
 
Disponibil în IBN: 12 februarie 2019


Rezumat

The nature of interaction of inorganic glasses with impulse magnetic field has been insufficiently studied. This research seeks to determine the influence of electromagnetic fields on the operational properties of industrial glassware. The aim of the experiments was to investigate the factors affecting the mechanical strength of glass containers exposed to impulse magnetic field. Jars, bottles and flasks of colorless glass of different capacities were subjects of the experiment. The chemical composition of colorless glass is the following (weight, %): 71.58 SiO2, 2.55 Al2O3, 0.07 Fe2O3, 6.64 CaO, 4.19 MgO, 14.69 Na2O, 0.33 SO3. Newly-formed glassware was subjected to thermomagnetic treatment on the conveyor, when they were transported from the sectional glass-forming machine to the annealing furnace. The main regimes of thermomagnetic treatment of glass containers were the following: temperature – between 450 and 600 oC, the value of vector‘s magnitude of the magnetic induction (VMMI) – up to 80 mT, field strength - 0.064 MA/m, duration of an impulse - 25 μs, number of pulses per one glassware - between 2 and 10, pulses follow at a frequency - between 1 and 7 Hz. The glassware was exposed to the homogeneous magnetic field for approximately 2 to 4 s. The mechanical strength of jars, bottles and flasks is characterized by resistance to internal hydrostatic pressure (RIHP). Additionally, the jars were tested on the resistance of compressive force in the directions of vertical axis to the body (RCFDVAB) and the resistance of compressive force in the directions perpendicular to the body walls (RCFDPBW). In our experiments, the maximum mechanical strength of glassware was measured. For this purpose, the glassware was tested on RCFDVAB, RCFDPBW and RIHP to its complete destruction. The number of glassware items for testing in each batch was not less than 20 pieces. Attention must be paid to such an important factor in determining the operational properties of glass containers, as the number of section on the glass-forming machine. Our experiments showed that the strength of the jars, produced at the same time in different sections, is not the same. Consequently, for each series of experiments jars molded in the same section were used. Thermomagnetic treatment of glass was carried out in conditions of stable operation of glass-forming machine. No special measures were taken to prevent damaging the glass surface. The effect of the magnetic field on the glass did not change its state visually. This research determined the influence of the following factors on the mechanical strength of a glass container exposed to impulse magnetic field: glass temperature, MVMI value, duration of treatment, frequency of pulses, and the position of magnetic field lines in relation to the plane of the walls of the glassware. Experiments have shown that the average value of mechanical strength of glassware subjected to thermomagnetic treatment increases up to 20 %, and the minimum level of strength increases by almost up to 30 %, which is especially important. The higher the temperature of glass and the value of the MVMI, the longer the duration of treatment, the greater the mechanical strength of the glassware. A higher effect is achieved, if the position of the magnetic lines is perpendicular in relation to the plane of the glass walls. The strengthening of glass containers means that it becomes possible to reduce the specific weight of glassware by 5-10 %, and this will make it possible to reduce the cost of material and energy resources for its production