scholarly journals Microwave Heating of Cordierite Ceramic Substrate for After Treatment Systems

2020 ◽  
Vol 31 ◽  
pp. 23-29
Author(s):  
R. C. Marin ◽  
S. V. Savu
Keyword(s):  
Composite Material ◽  
Microwave Heating ◽  
Microwave Power ◽  
Reduction Process ◽  
Ceramic Substrate ◽  
Nox Emissions ◽  
Fast Heating ◽  
Load Impedance ◽  
Catalytic Core ◽  
Matching Load

Selective catalyst reduction is one of the most affordable and successful technologies aimed at reducing NOx emissions from diesel engines. However, the reduction process can be achieved if a certain temperature is reached for the ceramic substrate of the catalytic core. The required temperatures for catalytic reaction vary from 2500 C to 4500 C depending on the technology applied in the catalytic processes. This paper aims at presenting preliminary research in microwave cordierite heating, which is a type of magnesium aluminium silicate used as ceramic honeycomb substrate (catalyst monolith) in the after treatment system in the automotive industry. The research focused on testing the Mg2Al4Si5O18 composite material (cordierite) for different microwave heating regimes in order to establish the level of microwave power required for fast heating. This application will be subject for the further development of new MW-SCR after treatment systems in order to reduce the NOx emissions at cold start engine or low operating regimes of non-road mobile machinery engines. The ceramic composite material was heated for 5 levels of microwave power, from 600 W to 1400 W, using a 6 kW microwave generator coupled with a matching load impedance tuner, and the temperatures were recorded using an IR pyrometer.

Behavior of Microwave Heating of 316 Stainless Steel Green Body

2014 ◽  
Vol 936 ◽  
pp. 1694-1700
Author(s):  
Zhi Wei Li ◽  
Kai Yong Jiang ◽  
Fei Wang ◽  
Ji Liang Zhang
Keyword(s):  
Particle Size ◽  
Stainless Steel ◽  
Microwave Heating ◽  
Powder Particle ◽  
Microwave Power ◽  
Arc Discharge ◽  
Steel Powder ◽  
Powder Particle Size ◽  
Auxiliary Heating ◽  
316 Stainless Steel

This paper mainly introduces the mechanism of microwave heating: electric conduction loss, eddy current loss and arc discharge. The microwave heating behavior of 316 stainless steel powder body which made by gel casting was investigated in the paper. Experiments on different microwave power, powder particle size, and the content of auxiliary heating material showed that the smaller the powder particle size, the larger microwave power and auxiliary heating materials help 316 stainless steel body for sintering.

scholarly journals The multiplicity of steady-state solutions arising from microwave heating. I. Infinite Biot number and small penetration depth

2001 ◽  
Vol 43 (1) ◽  
pp. 87-103 ◽  
Author(s):  
M. I. Nelson ◽  
G. C. Wake ◽  
X. D. Chen ◽  
E. Balakrishnan
Keyword(s):  
Steady State ◽  
Microwave Heating ◽  
Penetration Depth ◽  
Biot Number ◽  
Microwave Power ◽  
Phase Plane ◽  
Solid Materials ◽  
Temperature Function ◽  
Class A ◽  
Steady State Solutions

AbstractMicrowave heating of porous solid materials has received considerable attention in recent years because of its widespread use in industry. In this study, the microwave power absorption term is modelled as the product of an exponential temperature function with function that decays exponentially with distance. The latter describes the penetration of material by the microwaves.We investigate the phenomena of multiplicity in class A geometries, paying particular attention to how the penetration function affects the behaviour of the system. We explain why the phase-plane techniques which have been used in the case when the penetration term is constant do not extend to non-constant penetration.

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.

scholarly journals Effect of Microwave Heating Conditions on the Preparation of High Surface Area Activated Carbon from Waste Bamboo

2015 ◽  
Vol 34 (7) ◽  
pp. 667-674
Author(s):  
Jian Wu ◽  
Hongying Xia ◽  
Libo Zhang ◽  
Yi Xia ◽  
Jinhui Peng ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Microwave Heating ◽  
Surface Area ◽  
Microwave Power ◽  
High Surface ◽  
High Surface Area ◽  
Significant Proportion ◽  
Heating Time ◽  
Raw Material ◽  
Carbon Surface

Abstract The present study reports the effect of microwave power and microwave heating time on activated carbon adsorption ability. The waste bamboo was used to preparing high surface area activated carbon via microwave heating. The bamboo was carbonized for 2 h at 600°C to be used as the raw material. According to the results, microwave power and microwave heating time had a significant impact on the activating effect. The optimal KOH/C ratio of 4 was identified when microwave power and microwave heating time were 700 W and 15 min, respectively. Under the optimal conditions, surface area was estimated to be 3441 m2/g with pore volume of 2.093 ml/g and the significant proportion of activated carbon was microporous (62.3%). The results of Fourier transform infrared spectroscopy (FTIR) were illustrated that activated carbon surface had abundant functional groups. Additionally the pore structure is characterized using Scanning Electron Microscope (SEM).

Esterification of Rice Straw Cellulose Using Microwave Heating for Plastic Film Preparation

2016 ◽  
Vol 709 ◽  
pp. 86-90
Author(s):  
Phanumas Chaiworn ◽  
Usarat Ratanakamnuan
Keyword(s):  
Microwave Heating ◽  
Rice Straw ◽  
Microwave Power ◽  
Cellulose Ester ◽  
Solvent Casting ◽  
Casting Method ◽  
Elongation At Break ◽  
Cellulose Films ◽  
Film Preparation ◽  
Modified Cellulose

Esterified rice straw cellulose was synthesized by the reaction of cellulose with lauroyl chloride in the presence of toluene medium. Microwave heating was used to accelerate the esterification of cellulose. The optimum condition for esterification was investigated in term of microwave power and reaction time. Solubility of modified cellulose was characterized. The cellulose films were prepared by solvent casting method and mechanical properties of cellulose films were tested. The result shows that the best condition for cellulose esterification was 100 W of microwave power and 15 minute of esterification time. Percentage of weight increase of esterified cellulose at this condition was 143.83 %. Modified cellulose can be dissolved in organic solvent such as toluene, dichloromethane and chloroform. Tensile properties of cellulose films were examined. Tensile strength, Young’s modulus and % elongation at break of rice straw cellulose ester film were 2.33 MPa, 56.63 MPa and 4.21 %, respectively.

702 Effects of The Microwave Power on Spray Diffusion of The Liquid Injector with The Local Contact Microwave Heating

2007 ◽  
Vol 2007.44 (0) ◽  
pp. 263-264
Author(s):  
Tetsuya IIDA ◽  
Hiroshi ENOMOTO ◽  
Noboru HIEDA ◽  
Yukiko IMAI ◽  
Hitoshi HARA
Keyword(s):  
Microwave Heating ◽  
Microwave Power ◽  
Local Contact ◽  
Liquid Injector

Processing Parameters of Continuous Microwave Heating of Ethylene-Propylene Terpolymer

1984 ◽  
Vol 57 (1) ◽  
pp. 134-144 ◽  
Author(s):  
C. S. Wang
Keyword(s):  
Microwave Heating ◽  
Energy Absorption ◽  
Residence Time ◽  
Temperature Rise ◽  
Microwave Power ◽  
Power Level ◽  
Processing Parameters ◽  
Heating Process ◽  
Microwave Power Level ◽  
Absorption Characteristics

Abstract In continuous microwave heating, the temperature rise of rubber extrudates and the level of unabsorbed or reflected microwave power are strongly dependent upon the microwave power level, residence time, and extrudate configuration. It is therefore essential to control these processing parameters, together with the energy absorption characteristics of rubber materials, to improve the efficiency of microwave heating process.

scholarly journals Microwave power absorption profile of detergent surfactant agglomerates during microwave heating

2017 ◽  
Vol 36 (3) ◽  
pp. 325-331 ◽  
Author(s):  
Muhammad Y. Sandhu ◽  
Sharjeel Afridi ◽  
Qari Khalid ◽  
Ian C. Hunter ◽  
Nigel S. Roberts
Keyword(s):  
Microwave Heating ◽  
Microwave Power ◽  
Absorption Profile ◽  
Power Absorption
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