Thermal emission properties of Al2O3/Er3Al5O12 eutectic ceramics

Nakagawa, Narihito; Ohtsubo, Hideki; Waku, Yoshiharu; Yugami, Hiroo

doi:10.1016/j.jeurceramsoc.2005.01.031

Cited by 91 publications

(46 citation statements)

References 12 publications

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“…Furthermore, thermal emission of these samples presented a more selective emission, i.e. emission out of Er 3+ emission bands was lower than those produced by the Bridgman technique [14]. Worth noting is that thermal emission of both DSE layers and eutectic particles presented significant differences when compared to the obtained in cylindrical geometry.…”

Section: Selective Thermal Emissionmentioning

confidence: 75%

Directionally solidified fabrication in planar geometry of Al_2O_3-Er_3Al_5O_12 eutectic composite for thermophotovoltaic devices

2016

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Abstract:In this work Al 2 O 3 -Er 3 Al 5 O 12 eutectic composite was manufactured in planar geometry departing from eutectic particles both produced by directional solidification using a CO 2 laser system at rates of 180 and 720 mm/h. Microstructure and mechanical properties were investigated as a function of the growth rate. Homogeneous and interpenetrated microstructure was found with phase size strongly dependent on the growth rate, decreasing when the processing rate was increased. Thermal emission of eutectic composites was studied in function of thermal excitation by using CO 2 laser radiation as a heating source. An intense narrow emission band at 1.55 µm matching with the sensitive region of the InGaAs photoconverter and a low emission band at 1 µm were obtained. Features of thermal emission bands were correlated with collecting angle, microstructure and laser power, and compared to those obtained from departing eutectic particles.

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Section: Selective Thermal Emissionmentioning

confidence: 75%

Directionally solidified fabrication in planar geometry of Al_2O_3-Er_3Al_5O_12 eutectic composite for thermophotovoltaic devices

2016

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“…CH 4 was used for fuel and air (O 2 ;21 %, N 2 ;79 %) was used for oxidant. The flow rate of CH 4 and air was controlled by mass flowmeters, and CH 4 and air were premixed in the mixing section. The premixed gas of CH 4 and air was supplied from the inlet port to the combustion chamber and the burned exhaust gas was exhausted from the outlet port to the vent.…”

Section: Experimental Apparatusmentioning

confidence: 99%

“…In particular, a thermophotovoltaic (TPV) generation system, which converts radiated infrared ray to electric power, is developed by many research groups, because of a lot of advantages such as high reliability as well as little demerits of the size reduction [2][3][4][5]. In the present research, to develop a small scale and high intensity heat source and to establish the method of generating near infrared ray (NIR) radiation for a TPV generation system, we proposed a new concept of the TPV generation system; the feature of the system is a small scale catalytic combustor applying the sphere-shaped pellet catalysts, which generate NIR as heat source / emitter and need lower activation energy for the combustion reaction.…”

Section: Introductionmentioning

confidence: 99%

Development of a Pellet Catalytic Combustor for a Small Scale Generation System Using Near Infrared Ray Irradiation

Ohmura

Keida

Seo

et al. 2009

JTST

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Several geometric types of the small scale catalytic combustors applying the pellet catalysts as both the heat source and the emitter for infrared ray generation were developed in order to investigate the catalytic combustion phenomenon and the effective operation conditions for the TPV generation system. The results of temperature measurements and exhaust gas analyses showed that there were the optimal width and length of the combustor geometry for the high combustion efficiency and the reduction of the residual CO concentration. The ultraviolet and visible spectral measurements showed that the surface chemical reaction was predominant in the catalytic combustion and the gas phase reaction which causes higher temperature and higher reaction rate than those of the surface reaction scarcely occurred in the developed combustor. The near infrared spectral measurements showed that the pellet catalysts in the combustor could play the role of the emitter for the TPV generation system.

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“…infrared thermal tubes) have good emissivity and high temperature reliability. Furthermore, compared with other rare earth oxide selective emitters such as Er 2 O 3 (erbia) and Yb 2 O 3 (ytterbia), 12,13 it is easier to fabricate broadband emitters into a cylindrical shape. Hence, the infrared thermal tube chosen is made from a mixture of Al 2 O 3 and ZrO 2 .…”

Section: Emitters and Photovoltaic Cellsmentioning

confidence: 99%

“…10,11 Most TPV power systems utilize hydrogen and gas hydrocarbons for fuel, but not liquid hydrocarbons so far. Furthermore, recent investigations have emphasized the application and improvement of selective emitters 12,13 and narrowband photovoltaic (PV) cells.…”

Section: Introductionmentioning

confidence: 99%

Performance of a mesoscale liquid fuel‐film combustion‐driven TPV power system

Lien

Chao

et al. 2008

Progress in Photovoltaics

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Combustion-driven thermophotovoltaic (TPV) systems have obtained increasing attention in recent decades, but most studies have focused on developing narrowband photovoltaic cells and selective emitters. In terms of the heat source, conventional combustion configurations and light gaseous fuels are extensively utilized in macro-or meso-scale TPV power systems to simplify thermal management and mechanical fabrication. As far as miniaturization is concerned, however, fuelling these systems with liquid hydrocarbons would provide inherent advantages of high energy density and low volatility. Liquid fuels also promise easy and safe fuel recharging for small-scale power systems. In this paper, a central porous-medium combustor was employed in a small scale TPV power system. The combustor incorporated an emitting chamber wall and a heat recuperator. The radiant efficiency and overall efficiency were compared using different liquid hydrocarbon fuels in the system. The electric output characteristics of the combustion driven TPV system have been investigated to demonstrate the feasibility of a GaSb cell-based TPV power system and to provide design guidance for mesoscale liquid-burning TPV systems.

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Thermal emission properties of Al2O3/Er3Al5O12 eutectic ceramics

Cited by 91 publications

References 12 publications

Directionally solidified fabrication in planar geometry of Al_2O_3-Er_3Al_5O_12 eutectic composite for thermophotovoltaic devices

Directionally solidified fabrication in planar geometry of Al_2O_3-Er_3Al_5O_12 eutectic composite for thermophotovoltaic devices

Development of a Pellet Catalytic Combustor for a Small Scale Generation System Using Near Infrared Ray Irradiation

Performance of a mesoscale liquid fuel‐film combustion‐driven TPV power system

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