Examination of patterns in obtaining porous structures from submicron aluminum oxide powder and its mixtures
| Autor: | Edwin Gevorkyan, Liudmyla Voloshyna, Olga Melnik, Volodymyr Nerubatskyi, Yuriy Gutsalenko |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Liquid metal
Materials science 020209 energy polymer 0211 other engineering and technologies Energy Engineering and Power Technology chemistry.chemical_element aluminum oxide 02 engineering and technology ceramic filter Industrial and Manufacturing Engineering chemistry.chemical_compound silicon carbide Management of Technology and Innovation 021105 building & construction 0202 electrical engineering electronic engineering information engineering Silicon carbide T1-995 Industry Ceramic Electrical and Electronic Engineering Composite material Porosity Technology (General) porous structure Applied Mathematics Mechanical Engineering permeability coefficient Thermal decomposition HD2321-4730.9 Computer Science Applications Titanium oxide chemistry Control and Systems Engineering visual_art visual_art.visual_art_medium Dispersion (chemistry) Titanium |
| Zdroj: | Eastern-European Journal of Enterprise Technologies, Vol 6, Iss 6 (108), Pp 41-49 (2020) |
| Popis: | This paper proposes an economical thermal cycle of the production of ceramic articles from submicronic powders of aluminum oxide, titanium oxide, and manganese oxide. The implementation of a given cycle involves the introduction of a special aluminophosphate bond into the charge in order to reduce the temperature of firing. The optimal composition of the material for a foam-ceramic filter with the highest physical and mechanical properties has been determined; the optimal method for preparing the original charge and the baking mode have been selected. According to the results of tests under industrial conditions, the manufactured alumina filters became a decent alternative to known analogs used in aluminum metallurgy for the purification of liquid metal. The application and rational dosage of titanium dioxides, manganese, and aluminum aluminophosphate in porous ceramic compositions on an alumina base have made it possible to significantly reduce the time and, consequently, improve the productivity, of firing. The results obtained were evaluated by the level of maximum temperature in the cycle of heat treatment according to known technologies. Compared to those technologies, the developed technology ensures the growth of firing productivity when implementing the proposed solution by about 220%. It was found that the high true density of ceramic powder requires large dispersion as the relatively large powder particles are significantly worse retained in foam films and settle. At medium (intermediate) temperatures, a large weight loss occurs at a heating rate of 10°C/h. In this case, the decomposition progress changes in proportion to the heating speed. Changing the heating speed with temperature is the most effective technique for deparaffinization in the air. The heating time from the ambient temperature to 200°C significantly decreases. At a certain temperature, prior to the thermal decomposition, the bond would transfer from a strongly viscous state to a liquid state |
| Databáze: | OpenAIRE |
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