Densification of Alumina Ceramics Sintered by Using Submillimeter Wave Gyrotron

Sudiana, I Nyoman; Ito, Rei; Inagaki, Shunsuke; Kuwayama, Kenta; Sako, K.; Mitsudo, S.

doi:10.1007/s10762-013-0011-6

Cited by 39 publications

(32 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The maximum density of sintered alumina by using the electric furnace (conventional), on the other hand, was approximately 97%. The details of the comparative study of densification of alumina heated with these frequencies as well as with the conventional heating have been reported previously [9]. Figure 3 shows pore eliminations of alumina after sintering.…”

Section: Resultsmentioning

confidence: 86%

“…Notice that such curves were obtained from a set of 3-5 samples for each point. The conspicuous difference in temperatures of the shrinkages might not mislead because they were in a volumetric microwave heating condition [9]. The maximum temperatures at the central part and the surface of the samples could not be significantly different.…”

Section: Resultsmentioning

confidence: 97%

“…The applicator had a cylindrical shape with a diameter of 45 cm, and a height of 88 cm. The detail of the system has been published elsewhere [7,9]. All experiments were performed at temperatures of 700 o C to 1700 o C.…”

Section: Sinteringmentioning

confidence: 99%

“…The systems have been applied on various ceramics [8][9][10]. Some enhancements caused by such high frequencies were revealed.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The microwave effects on the properties of alumina at high frequencies of microwave sintering

Sudiana¹,

Mitsudo²,

Sako³

et al. 2016

AIP Conference Proceedings

View full text Add to dashboard Cite

Section: Resultsmentioning

confidence: 86%

Section: Resultsmentioning

confidence: 97%

Section: Sinteringmentioning

confidence: 99%

“…The systems have been applied on various ceramics [8][9][10]. Some enhancements caused by such high frequencies were revealed.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The microwave effects on the properties of alumina at high frequencies of microwave sintering

Sudiana¹,

Mitsudo²,

Sako³

et al. 2016

AIP Conference Proceedings

View full text Add to dashboard Cite

“…The alternating electrical field component in microwave processing is used to polarize the ceramic, an inherently lossy process, thereby transferring energy to the crystal lattice with every reversal while rapidly heating the material (Sudiana et al, 2013). Notably, the higher frequencies above about 28 GHz that are needed to prevent formation of standing waves in the chamber and resultant hot spots in the material (Sudiana et al, 2013) may prevent its use in a co-sintering application of a battery device, since the bulk of the device would be effectively shielded by any electronically conductive materials (Bokhan et al, 1995).…”

mentioning

confidence: 99%

Improving NASICON Sinterability through Crystallization under High-Frequency Electrical Fields

Lisenker

Stoldt

2016

Front. Energy Res.

View full text Add to dashboard Cite

The effect of high-frequency (HF) electric fields on the crystallization and sintering rates of a lithium aluminum germanium phosphate (LAGP) ion conducting ceramic was investigated. LAGP with the nominal composition Li1.5Al0.5Ge1.5(PO4)3 was crystallized and sintered, both conventionally and under effect of electrical field. Electrical field application, of 300 V/cm at 1 MHz, produced up to a 40% improvement in sintering rate of LAGP that was crystallized and sintered under the HF field. Heat sink effect of the electrodes appears to arrest thermal runaway and subsequent flash behavior. Sintered pellets were characterized using X-ray diffraction, scanning electron microscope, TEM, and electrochemical impedance spectroscopy to compare conventionally and field-sintered processes. The as-sintered structure appears largely unaffected by the field as the sintering curves tend to converge beyond initial stages of sintering. Differences in densities and microstructure after 1 h of sintering were minor with measured sintering strains of 31 vs. 26% with and without field, respectively. Ionic conductivity of the sintered pellets was evaluated, and no deterioration due to the use of HF field was noted, though capacitance of grain boundaries due to secondary phases was significantly increased.

show abstract

Development of the Multifrequency Gyrotron FU CW GV with Gaussian Beam Output

Tatematsu¹,

Yamaguchi²,

Ichioka³

et al. 2015

J Infrared Milli Terahz Waves

View full text Add to dashboard Cite

Gyrotron FU CW GV has been developed as a multifrequency gyrotron for operation over the frequency range from 162 to 265 GHz at frequencies separated by steps of approximately 10 GHz. The oscillation modes were selected; the radii of the caustic surfaces for the electromagnetic waves of the modes had similar values in the waveguide, and it was therefore expected that these modes would be converted into Gaussian beams by a mode converter. In reality, more than ten modes oscillated and the Gaussian-like beams were radiated. A double-disk window with variable spacing maintains the transmittance through the window at a high level over a wide range of frequencies. Using this window, output powers of more than 1 kW were observed for almost all the expected modes.

show abstract

Densification of Alumina Ceramics Sintered by Using Submillimeter Wave Gyrotron

Cited by 39 publications

References 12 publications

The microwave effects on the properties of alumina at high frequencies of microwave sintering

The microwave effects on the properties of alumina at high frequencies of microwave sintering

Improving NASICON Sinterability through Crystallization under High-Frequency Electrical Fields

Development of the Multifrequency Gyrotron FU CW GV with Gaussian Beam Output

Contact Info

Product

Resources

About