Development of material processing system by using a 300 GHz CW gyrotron

Mitsudo, S.; Hoshizuki, H.; Idehara, T.; Saito, T.

doi:10.1088/1742-6596/51/1/124

Cited by 26 publications

(10 citation statements)

References 10 publications

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“…As a radiation source for microwave sintering a sub-millimeter wave gyrotron (Gyrotron FU CW I, [19,20]) with an output power of 1.75 kW and a frequency of 300 GHz in a continuous wave (CW) operation has been used. The tube operates on TE 22,8 mode at the fundamental of the cyclotron frequency, corresponding to a magnetic field intensity of 10.9 T. The gyrotron is installed in a liquid cryogen free supper-conducting magnet with a maximum field intensity of 12 T. The tube has an internal quasi-optical mode converter, which transforms the wave generated in the resonant cavity to a well-collimated linearly polarized Gaussian beam.…”

Section: Silica Xerogel Ceramic Sinteringmentioning

confidence: 99%

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Rapid Sintering of Silica Xerogel Ceramic Derived from Sago Waste Ash Using Sub-millimeter Wave Heating with a 300 GHz CW Gyrotron

Aripin

Mitsudo

Sudiana

et al. 2011

J Infrared Milli Terahz Waves

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In this paper, we present and discuss experimental results from a microwave sintering of a silica-glass ceramic, produced from a silica xerogel extracted from a sago waste ash. As a radiation source for the microwave heating a sub-millimeter wave gyrotron (Gyrotron FU CW I) with an output frequency of 300 GHz has been used. The powders of silica xerogel have been dry pressed and then sintered at temperatures ranging from 300°C to 1500°C. The influence of the sintering temperature on the technological properties such as porosity and bulk density was studied in detail. Furthermore, X-ray diffraction (XRD) and Fourier Transform Infrared (FTIR) spectroscopy have been used in order to study the structure of the produced silica glass-ceramics. It has been found that the silica xerogel crystallizes at a temperature of 800°C, which is about 200°C lower than the one observed in the conventional process. The silica xerogel samples sintered by their irradiation with a sub-millimeter wave at 900°C for 18 minutes are fully crystallized into a silica glassceramic with a density of about 2.2 g/cm 3 and cristobalite as a major crystalline phase. The results obtained in this study allow one to conclude that the microwave sintering with sub-millimeter waves is an appropriate technological process for production of silica glass-ceramics from a silica xerogel and is characterized with such advantages as shorter times of the thermal cycle, lower sintering temperatures and higher quality of the final product.

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Section: Silica Xerogel Ceramic Sinteringmentioning

confidence: 99%

“…Figure 1 shows the experimental set-up. Besides the gyrotron the system includes an applicator, a transmission system, and a control system [20]. The output power of the gyrotron was tuned smoothly by varying the electron beam voltage.…”

Section: Silica Xerogel Ceramic Sinteringmentioning

confidence: 99%

Rapid Sintering of Silica Xerogel Ceramic Derived from Sago Waste Ash Using Sub-millimeter Wave Heating with a 300 GHz CW Gyrotron

Aripin

Mitsudo

Sudiana

et al. 2011

J Infrared Milli Terahz Waves

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show abstract

“…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%

“…For ceramic sintering, millimeter and sub-millimeter wave processing systems by using gyrotrons as radiation sources have been developed [6][7]. The systems have been applied on various ceramics [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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

Sudiana¹,

Mitsudo²,

Sako³

et al. 2016

AIP Conference Proceedings

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“…As a radiation source the gyrotron FU CW I was used [19,20]. This device, which is specially designed with parameters that are appropriate for a microwave treatment, generates radiation in a continuous wave (CW) mode and delivers a well-collimated linearly polarized Gaussian beam (formed by an internal mode converter).…”

Section: Silica Xerogel Ceramic Sinteringmentioning

confidence: 99%

Structural and Microwave Properties of Silica Xerogel Glass-Ceramic Sintered by Sub-millimeter Wave Heating using a Gyrotron

Aripin

Mitsudo

Prima

et al. 2012

J Infrared Milli Terahz Waves

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In this paper, we present and discuss experimental results from a microwave sintering of silica glass-ceramics, produced from amorphous silica xerogel extracted from sago waste ash. As a radiation source for a microwave heating a sub-millimeter wave gyrotron (Gyrotron FU CW I) with an output frequency of 300 GHz has been used. The powders of the amorphous silica xerogel have been dry pressed and then sintered at temperatures ranging from 300°C to 1200°C. Microwave absorbing properties of the sintered samples were investigated by measuring the dielectric constant, the dielectric loss, and the reflection loss at different frequencies in the interval from 8.2 to 12.4 GHz. Furthermore, the characteristics of the formation process for producing silica glassceramics were studied using a Raman Spectroscopy and a Scanning Electron Microscopy (SEM). The results indicate that the samples sintered at 1200°C are characterized by lower reflection losses and a better transparency due to the formation of a fully crystallized silica glass-ceramic at sufficiently high temperature.

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Development of material processing system by using a 300 GHz CW gyrotron

Cited by 26 publications

References 10 publications

Rapid Sintering of Silica Xerogel Ceramic Derived from Sago Waste Ash Using Sub-millimeter Wave Heating with a 300 GHz CW Gyrotron

Rapid Sintering of Silica Xerogel Ceramic Derived from Sago Waste Ash Using Sub-millimeter Wave Heating with a 300 GHz CW Gyrotron

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

Structural and Microwave Properties of Silica Xerogel Glass-Ceramic Sintered by Sub-millimeter Wave Heating using a Gyrotron

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