Phase investigations of manganese-bismuth alloyed in a microwave furnace

2020 ◽  
Vol 27 (8) ◽  
pp. 2220-2226
Author(s):  
Panita Thongjumpa ◽  
Thanida Charoensuk ◽  
Upsorn Boonyang ◽  
Phimphaka Harding ◽  
Chitnarong Sirisathitkul
Keyword(s):  
Microwave Furnace ◽  
Manganese Bismuth

Firing of Bauxite Extrudates in a Variable Frequency Microwave Furnace

1998 ◽  
Vol 33 (1) ◽  
pp. 31-35 ◽  
Author(s):  
X. Tan ◽  
N. Munroe ◽  
Z. Fathi ◽  
R. Garard
Keyword(s):  
Variable Frequency ◽  
Microwave Furnace

Microwave Sintering of YSZ Electrolyte Materials for SOFC

2008 ◽  
Vol 368-372 ◽  
pp. 238-240 ◽  
Author(s):  
Xi Tang Wang ◽  
Girish M. Kale
Keyword(s):  
Microwave Sintering ◽  
X Ray Diffraction ◽  
Final Phase ◽  
X Ray ◽  
Microwave Furnace ◽  
Scanning Electron Microcopy ◽  
Conventional Sintering ◽  
Y2o3 Content ◽  
Ysz Electrolyte ◽  
Considerable Enhancement

Microwave sintering behaviors of four different compositions of YSZ electrolyte materials were investigated. The samples were sintered in 2.45GHz microwave furnace. For comparison, conventional sintering was performed at 1821K.The densities of sintered samples showed considerable enhancement in the densification process under the influence of microwave fields. The samples with lower Y2O3 content are easy to sinter. The influence of the composition and sintering methods on the final phase composition and microstructure were investigated by X-ray diffraction and scanning electron microcopy. Finer and more uniform microstructures were observed in the microwave sintered samples comparing to the conventionally sintered samples.

scholarly journals Numerical modeling of microwave heating

2010 ◽  
Vol 42 (1) ◽  
pp. 99-124 ◽  
Author(s):  
A.K. Shukla ◽  
A. Mondal ◽  
A. Upadhyaya
Keyword(s):  
Thermal Conductivity ◽  
Numerical Modeling ◽  
Temperature Distribution ◽  
Microwave Heating ◽  
Two Dimensional ◽  
Conventional Furnace ◽  
Microwave Furnace ◽  
Simulation Results ◽  
Heating Behavior ◽  
Cylindrical Samples

The present study compares the temperature distribution within cylindrical samples heated in microwave furnace with those achieved in radiatively-heated (conventional) furnace. Using a two-dimensional finite difference approach the thermal profiles were simulated for cylinders of varying radii (0.65, 6.5, and 65 cm) and physical properties. The influence of susceptor-assisted microwave heating was also modeled for the same. The simulation results reveal differences in the heating behavior of samples in microwaves. The efficacy of microwave heating depends on the sample size and its thermal conductivity.

scholarly journals Effect of porosity and particle size on microwave heating of copper

2010 ◽  
Vol 42 (2) ◽  
pp. 169-182 ◽  
Author(s):  
A. Mondal ◽  
A. Shukla ◽  
A. Upadhyaya ◽  
D. Agrawal
Keyword(s):  
Particle Size ◽  
Particle Sizes ◽  
Metallic Materials ◽  
Bulk Materials ◽  
Microwave Furnace ◽  
Particulate Form ◽  
Heating Profiles ◽  
Powder Compacts ◽  
Heating Behavior ◽  
Difference Time

The present study investigates the effect of varying particle size and porosity on the heating behavior of a metallic particulate compact in a 2.45GHz multimode microwave furnace. Experiments on copper suggest that unlike monolithic (bulk) materials, metallic materials do couple with microwaves when they are in particulate form. The powder compacts having higher porosity and smaller particle sizes interact more effectively with microwaves and are heated more rapidly. A dynamic electromagnetic-thermal model was developed to simulate the temporal temperature distribution using a 2-D finite difference time domain (FDTD) approach. The model predicts the variation in temperature with time during heating of copper powder compacts. The simulated heating profiles correlate well with those observed from experiments.

Microwave Processing of Silicon Nitride

1990 ◽  
Vol 189 ◽  
Author(s):  
T. N. Tiegs ◽  
J. O. Kiggans ◽  
H. D. Kimrey
Keyword(s):  
Silicon Nitride ◽  
Grain Boundary ◽  
Microwave Heating ◽  
Grain Growth ◽  
Microwave Power ◽  
Microwave Sintering ◽  
Microwave Processing ◽  
Microwave Furnace

ABSTRACTMicrowave sintering of Si3N4—based materials showed improved densification as compared to samples heated conventionally under similar conditions. Accelerated nitridation of Si in the microwave furnace to produce Si3N4 was also observed. Dense Si3N4, annealed by microwave heating, exhibited enhanced grain growth; however preferential coupling of the microwave power to the grain—boundary phases in the present experiments resulted in their degradation.

Comparison Study in Consolidation of Yttria Reinforced Iron-Chromium Composites Using Conventional and Microwave Sintering Technique

2013 ◽  
Vol 594-595 ◽  
pp. 832-836
Author(s):  
M. Marina ◽  
M.Z.M. Zamzuri ◽  
Mohd Nazree Derman ◽  
Mohd Asri Selamat ◽  
Z. Nooraizedfiza
Keyword(s):  
Mechanical Properties ◽  
Powder Metallurgy ◽  
Microwave Sintering ◽  
Slow Heating ◽  
Comparison Study ◽  
Sintering Time ◽  
Microwave Furnace ◽  
Crucible Furnace ◽  
Iron Based ◽  
Iron Chromium

This research is focused on studying the density and mechanical properties of iron-chromium composites consolidated by innovative rapid microwave sintering technology against conventionally sintered counterparts using slow heating crucible furnace. Another aim of this study is to assess the viability of yttria (Y2O3) ceramic particulates as reinforcement to the iron-chromium composites. Fabrication of iron-chromium-yttria composites consolidated in microwave furnace and conventional crucible furnace was successfully accomplished. Improvement of density is evident in microwave sintered composites. The Y2O3 addition significantly increases the hardness of the composite (118 Hv for microwave specimens as opposed to 110Hv for conventional specimens). The study also successfully established the viability of microwave sintering technique for consolidating iron based powder metallurgy composites by up to 80% reduction of sintering time.

Low-density silicon nitride beads as high-temperature microwave furnace insulation

1997 ◽  
Vol 32 (6) ◽  
pp. 749-754 ◽  
Author(s):  
Ross H. Plovnick ◽  
Zak Fathi ◽  
James O. Kiggans
Keyword(s):  
High Temperature ◽  
Silicon Nitride ◽  
Low Density ◽  
Microwave Furnace
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