Modeling of microwave heating of particulate metals

Mishra, Pratyush; Upadhyaya, Anish; Sethi, Guneet

doi:10.1007/s11663-006-0066-z

Cited by 128 publications

(64 citation statements)

References 18 publications

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“…[5][6][7][8][9] Magnetic and refractory powder metals appear to respond well to MW radiation compared with other powder metals which often show mild or weak responses. [10][11][12][13] Using the Heisenberg model, Tanaka et al [14] have recently shown that MW radiation can heat magnetic metal oxides to temperatures well above their Curie temperatures while it is essentially ineffective for non-magnetic oxides. Their modeling identified that such fast heating ''is caused by nonresonant response of electron spins in the unfilled 3d shell to the wave magnetic field,'' [14] and the effect ''persists above the Curie temperature T c because each electron spin is able to respond to the alternating magnetic field of MWs even above T c .''…”

Section: Introductionmentioning

confidence: 99%

Microwave Heating, Isothermal Sintering, and Mechanical Properties of Powder Metallurgy Titanium and Titanium Alloys

Luo¹,

Guan²,

Yang³

et al. 2012

Metall Mater Trans A

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This article presents a detailed assessment of microwave (MW) heating, isothermal sintering, and the resulting tensile properties of commercially pure Ti (CP-Ti), Ti-6Al-4V, and Ti-10V-2Fe-3Al (wt pct), by comparison with those fabricated by conventional vacuum sintering. The potential of MW sintering for titanium fabrication is evaluated accordingly. Pure MW radiation is capable of heating titanium powder to ‡1573 K (1300°C), but the heating response is erratic and difficult to reproduce. In contrast, the use of SiC MW susceptors ensures rapid, consistent, and controllable MW heating of titanium powder. MW sintering can consolidate CP-Ti and Ti alloys compacted from À100 mesh hydride-dehydride (HDH) Ti powder to~95.0 pct theoretical density (TD) at 1573 K (1300°C), but no accelerated isothermal sintering has been observed over conventional practice. Significant interstitial contamination occurred from the Al 2 O 3 -SiC insulation-susceptor package, despite the high vacuum used (£4.0 9 10 À3 Pa). This leads to erratic mechanical properties including poor tensile ductility. The use of Ti sponge as impurity (O, N, C, and Si) absorbers can effectively eliminate this problem and ensure good-to-excellent tensile properties for MW-sintered CP-Ti, Ti-10V-2Fe-3Al, and Ti-6Al-4V. The mechanisms behind various observations are discussed. The prime benefit of MW sintering of Ti powder is rapid heating. MW sintering of Ti powder is suitable for the fabrication of small titanium parts or titanium preforms for subsequent thermomechanical processing.

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Section: Introductionmentioning

confidence: 99%

Microwave Heating, Isothermal Sintering, and Mechanical Properties of Powder Metallurgy Titanium and Titanium Alloys

Luo¹,

Guan²,

Yang³

et al. 2012

Metall Mater Trans A

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“…The emitted heat of the plate warms the radiometer, so the prototype is enclosed and cooled with compressed air to maintain the radiometer temperature at 20 • C, avoiding gain drift due to temperature variations. Another problem found in the preliminary experiments was the low thermal emissivity of metals [9]. However, the measured plate is slightly oxidized.…”

Section: Experimental Hostile Scenariomentioning

confidence: 94%

Experimental Study of a Low-Cost Radiometer for Hostile Scenarios

León

2015

PIER Letters

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Abstract-Noncontact temperature measurements in industrial scenarios present great variety of difficulties (dust, vapor. . . ). In this work, the authors study the use of a low-cost microwave power radiometer to measure the temperature of hot metal plate during its cooling with water. Two different radiometers, centred at different frequency bands, have been experimentally considered. The radiometers have been surrounded with a metal box to reduce undesirable radiation. Several experiments have been carried out, showing the ability of these radiometers to detect the cooling of the plates. A recalibration of the radiometer gain can be done to compensate the gain variation of the circuitry of the radiometers.

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“…Density, specific heat capacity and thermal conductivity of the studied powders are assumed constant with respect to temperature in this study. However, the specific heat capacity of iron powder compact can be made temperature dependent considering the temperature dependent heat capacity function [23,24] expressed as: It is worth mentioning that use of temperature dependent C p as model input will make the high temperature processing of iron powder more effective.…”

Section: Estimation Of Effective Constitutive Propertiesmentioning

confidence: 99%

Multiphysics Model of Iron Powder Compacts for Efficient Microwave Processing

Devi¹,

Akhtar²,

Datta³

2017

PIER M

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Abstract-A generalized multiphysics model using COMSOL Multiphysics software for optimizing the sintering process of iron powders having various green densities is developed. The modeling is facilitated by designing a 30 GHz multimode applicator, where the test sample is placed for the microwave processing. The effective dielectric and magnetic properties of the resultant metal powder compact is estimated using the effective electromagnetic model considering the idea of core-shell particle approach followed by the Lichtenecker's mixture formula. A theoretical approach relating the penetration depth, proper impedance matching and volume fraction of different density powder compacts is also discussed here. From the study, it is clear that the effective dielectric and magnetic properties contribute to the microwave sintering process of metal powders.

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Modeling of microwave heating of particulate metals

Cited by 128 publications

References 18 publications

Microwave Heating, Isothermal Sintering, and Mechanical Properties of Powder Metallurgy Titanium and Titanium Alloys

Microwave Heating, Isothermal Sintering, and Mechanical Properties of Powder Metallurgy Titanium and Titanium Alloys

Experimental Study of a Low-Cost Radiometer for Hostile Scenarios

Multiphysics Model of Iron Powder Compacts for Efficient Microwave Processing

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