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10.3390/ma9080684 http://scihub22266oqcxt.onion/10.3390/ma9080684 C5512350!5512350!28773807     free     free     free Deprecated: Implicit conversion from float 231.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534       Materials+(Basel) 2016 ; 9 (8): ä Nephropedia Template TP {{tp|p=28773807|t=2016. On the Mechanism of Microwave Flash Sintering of Ceramics |pdf=|usr=}}{{28773807}} gab.com Text On the Mechanism of Microwave Flash Sintering of Ceramics JO: Materials (Basel) http://www.kidney.de/pget.php?&tw=1&pmid=28773807 #FOAvip The results of a study of ultra-rapid (flash) sintering of oxide ceramic materials under microwave heating with high absorbed power per unit volume of material (10?500 W/cm3) are presented. Ceramic samples of various compositions?Al2O3; Y2O3; MgAl2O4; and Yb(LaO)2O3?were sintered using a 24 GHz gyrotron system to a density above 0.98?0.99 of the theoretical value in 0.5?5 min without isothermal hold. An analysis of the experimental data (microwave power; heating and cooling rates) along with microstructure characterization provided an insight into the mechanism of flash sintering. Flash sintering occurs when the processing conditions?including the temperature of the sample; the properties of thermal insulation; and the intensity of microwave radiation?facilitate the development of thermal runaway due to an Arrhenius-type dependency of the material?s effective conductivity on temperature. The proper control over the thermal runaway effect is provided by fast regulation of the microwave power. The elevated concentration of defects and impurities in the boundary regions of the grains leads to localized preferential absorption of microwave radiation and results in grain boundary softening/pre-melting. The rapid densification of the granular medium with a reduced viscosity of the grain boundary phase occurs via rotation and sliding of the grains which accommodate their shape due to fast diffusion mass transport through the (quasi-)liquid phase. The same mechanism based on a thermal runaway under volumetric heating can be relevant for the effect of flash sintering of various oxide ceramics under a dc/ac voltage applied to the sample. Twit Text FOAVip On the Mechanism of Microwave Flash Sintering of Ceramics ????Materials (Basel) http://www.kidney.de/pget.php?&tw=1&pmid=28773807 #FOAvip Twit Text # Free Paper on # # # # # LINK http://www.kidney.de/pget.php?&tw=1&pmid=28773807 #FOAvip English Wikipedia <ref>{{Cite pmid|28773807}}</ref> On the Mechanism of Microwave Flash Sintering of Ceramics #MMPMID28773807 Bykov YV; Egorov SV; Eremeev AG; Kholoptsev VV; Plotnikov IV; Rybakov KI; Sorokin AA Materials (Basel) 2016[Aug]; 9 (8): ä PMID28773807show ga The results of a study of ultra-rapid (flash) sintering of oxide ceramic materials under microwave heating with high absorbed power per unit volume of material (10?500 W/cm3) are presented. Ceramic samples of various compositions?Al2O3; Y2O3; MgAl2O4; and Yb(LaO)2O3?were sintered using a 24 GHz gyrotron system to a density above 0.98?0.99 of the theoretical value in 0.5?5 min without isothermal hold. An analysis of the experimental data (microwave power; heating and cooling rates) along with microstructure characterization provided an insight into the mechanism of flash sintering. Flash sintering occurs when the processing conditions?including the temperature of the sample; the properties of thermal insulation; and the intensity of microwave radiation?facilitate the development of thermal runaway due to an Arrhenius-type dependency of the material?s effective conductivity on temperature. The proper control over the thermal runaway effect is provided by fast regulation of the microwave power. The elevated concentration of defects and impurities in the boundary regions of the grains leads to localized preferential absorption of microwave radiation and results in grain boundary softening/pre-melting. The rapid densification of the granular medium with a reduced viscosity of the grain boundary phase occurs via rotation and sliding of the grains which accommodate their shape due to fast diffusion mass transport through the (quasi-)liquid phase. The same mechanism based on a thermal runaway under volumetric heating can be relevant for the effect of flash sintering of various oxide ceramics under a dc/ac voltage applied to the sample. äOn the Mechanism of Microwave Flash Sintering of Ceramics (epmc).pdf DeepDyve Pubget Overpricing