Microwaves and Metals

Gupta, Manoj; Wong, Eugene Y.

doi:10.1002/9780470822746

Cited by 225 publications

(192 citation statements)

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“…In contrast, MW sintering of powder metals is only a recent development, [5] but it has attracted increasing attention because of its potential for both cost reduction and property improvements. [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.…”

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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“…Thus, microwave heating usually achieve more uniform sintering since the energy is dissipated within the layer due to internal friction between atoms with a thermal flux moving outward from the layer core [11]. While bulk metals are usually assumed to reflect microwave radiations, a coupling can be achieved with metallic powder [12].…”

Section: Microstructural Evolution With Respect To the Thermal Conditmentioning

confidence: 99%

Impact of variable frequency microwave and rapid thermal sintering on microstructure of inkjet-printed silver nanoparticles

et al. 2012

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The effect of thermal profile on microstructure is studied in the frame of thin films deposited by inkjet-printing technology. The role of sintering temperature and thermal ramp is particularly investigated. Fast heating ramps exhibit coarse grains and pores, especially when a hybrid microwave curing is performed. This enhanced growth is attributed to the quick activation of densifying sintering regimes without undergoing thermal energy loss at low temperature. Microstructural evolution of various sintered inkjet-printed films is correlated with electrical resistivity and with the Young's modulus determined by nanoindentation. A strong link between those three parameters is highlighted during experiments giving credit to either a surface or a fully volumetric sintering, according to the process. Sintering is then mainly triggered by surface mass transfer or by grain boundary diffusion respectively. Silver thin-films with an electrical resistivity 4 to 5 times higher than the bulk has been reached in a few minutes and with a Young's modulus of 38 GPa.

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“…The authors have developed a sintering setup which made use of microwave energy to rapidly sinter the magnesium nanocomposites without the need of an inert protective atmosphere. Details of the hybrid heating microwave sintering setup can be referenced from [24,25].…”

Section: High Performance Lightweight Magnesium Nanocomposites For Enmentioning

confidence: 99%

High Performance Lightweight Magnesium Nanocomposites for Engineering and Biomedical Applications

Wong¹,

Gupta²

2016

NanoWorld J

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Magnesium is the lightest structural metal that can be used for engineering applications and its non-toxic nature makes it attractive for use as a biomedical implant. The judicious addition of nanoparticles to magnesium assists in enhancing multiple engineering properties that are critical for its widespread use and are superior to that exhibited by conventional micron-size particles containing composites. The ability to improve mechanical properties with the use of smaller volume fraction of reinforcements while keeping density low makes magnesium nanocomposites an attractive choice for lightweight engineering and bio-resorbable biomedical applications. In view of the exceptional response of magnesium in presence of nano-length scale reinforcements, an attempt is made in this paper to provide a brief review of characteristics of several magnesium nanocomposites illustrating the effects of ceramic and metallic reinforcements to enhance mechanical properties.

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Microwaves and Metals

Cited by 225 publications

References 0 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

Impact of variable frequency microwave and rapid thermal sintering on microstructure of inkjet-printed silver nanoparticles

High Performance Lightweight Magnesium Nanocomposites for Engineering and Biomedical Applications

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