The article is devoted to mathematical modeling of high frequency electrothermic of thermoplastics in relation to a technological system in the form of the component plate, including electrodes, insulators, the processed material, and the study of the influence of termoisolation on heating of the thermoplastic. In the article the mathematical model in the form of a system of nonstationary heat transfer in considering the internal heat sources with different boundary conditions and delivers its software.
The software provided in article enables to study the influence of geometrical and electrophysical parameters of technological systems of high-frequency heating of the thermoplastic. In this article the results of research of influence of termoisolation on the nature of the heating of the thermoplastic. Based on the calculations presented in numerical and graphic kind, identified the following areas of heating polymer: uniform heating, regional zones of thermal influence of insulators. Heat-affected zone is characterized by depth and temperature of the contacting surfaces. The thickness increase of insulators over a certain value does not change the zone of thermal influence of insulators, which allows to speak about effective from the energy point of view of the thickness of the insulator, the excess of which increase energy consumption, time of heating of the polymer.
Conclusion is made according to result of the study about the necessity of the presence and settings termoisolations when building technological processes electrothermic of polymers. The developed software allows a new approach to the study of the RF heating, ensuring minimal energy consumption while ensuring uniform heating details.
Keywords: electrothermics, thermoplastic, mathematical model, polymer, thermoinsulator, welding, drying, polyamide, high-frequency treatment
High purity ultrafine aluminum nitride is produced by gas-phase approach, however there is an issue to divide AlF3 and AlN at the final step of synthesis. Recently, the problem is solved by sublimation of aluminum trifluoride in vacuum, but due to high temperatures aluminum nitride particles agglomerate into chunks with dimension about 8 μm, hence the new alternate methods of separation is in a great interest. Flotation in organic environment is considered to divide aluminum trifluoride and aluminum nitride. The process of AlN and AlF3 interaction with organic and element-organic matters was investigated and the following conclusions were made: there is agglomeration and sedimentation stability of AlN and AlF3 in organic environments and flotation possibility was experimentally proved, hence, flotation after special treatment is a possible approach to divide powders of aluminum trifluoride and nitride.
Keywords: aluminum trifluoride, aluminum nitride, gas-phase synthesis, aglomeration, sedimentation, sublimation
Information about authors of issue №1 (2013)
Keywords: authors
The short analysis of treatments of the concepts "monitoring", «social monitoring», «economic monitoring», "environmental monitoring" is provided in article. Consideration of complex system of ekologo-sotsoi-economic monitoring is offered, making elements of this system, and as its paramount tasks are defined.
Keywords: monitoring, environmental monitoring, social monitoring, economic monitoring, complex system ekologo-sotsoi-economic monitoring.
Information about authors of issue №4 (2011)
Keywords: authors