Fabrication and Evaluation of Thermal Insulation Materials by Using Nanoparticle/Fiber Composites for High Temperature

Ohmura, Takahiro; Ito, Yasuo; Abe, Isami; Abe, Hiroya; Naito, Makio

doi:10.4164/sptj.46.806

Cited by 4 publications

(4 citation statements)

References 11 publications

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“…The compact treated at 1000 rpm for 10 min also shows a low thermal conductivity of 0.037 W/m•K. The values are close to those of another fibrous alumina as determined by the cyclic heat method [20]. Figure 7 suggests that the rotating speed is an important parameter in terms of thermal conductivity.…”

Section: Characterization Of Fibrous Alumina Compactsupporting

confidence: 66%

“…The micrograph of the starting fibers is shown in Figure 1. The addition of ceramic fibers might enhance the strength and thermal resistance of the resulting insulation compact [20]. The diameter and length of the fibers were around 4 μm and several centimeters, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…The use of alumina nanoparticles may improve the high-temperature insulation capability. Though a lot of attention has been given to the use of alumina nanoparticles for engineering purposes, its application for thermal insulation is relatively lacking [20]. The present study aims to develop a compact composing of ceramic fiber and fumed alumina particles.…”

Section: Introductionmentioning

confidence: 99%

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Effect of mechanical processing on thermal and mechanical properties of fibrous fumed alumina compacts

Lian

Kondô

Kozawa

et al. 2018

Journal of Asian Ceramic Societies

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In the present study, the fibrous fumed alumina compact with low thermal conductivity is prepared with a mechanical processing technique. The thermal conductivity of the compact remains low up to a temperature of 350°C. For the fibrous compact, the mechanical processing parameters play important role on controlling the thermal insulation capability. The thermal conductivity of compact increases from 0.036 to 0.042 W/m•K by increasing the rotating speed of rotor. On the other hand, the value remains low by increasing processing time. The strength is decreased due to the increase of processing time. Thus, a lower rotating speed and a shorter processing time could result in a compact with favorable thermal insulation and strength. The results can be related to the surface structure of the coated alumina fibers and granulated structure within the compacts.

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Section: Characterization Of Fibrous Alumina Compactsupporting

confidence: 66%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of mechanical processing on thermal and mechanical properties of fibrous fumed alumina compacts

Lian

Kondô

Kozawa

et al. 2018

Journal of Asian Ceramic Societies

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“…近年，低炭素社会を実現するために，さまざまな分野で省エネルギー化を推進するための活動が数多くなされている。中でも，建築物や設備の省エネルギー化は喫緊の課題として取り上げられており，特に高断熱化が不可欠とされ，真空断熱材 [1]やナノ多孔質断熱材などの新しい断熱材が開発されている。これらは，従来から広く使われている人造鉱物繊維断熱材，無機多孔質保温材，発泡プラスチック断熱材 [2][3][4] Joining and Welding Research Institute, Osaka University (11-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan) * Corresponding Author tasaka@jtccm.or.jp への利用が期待されている。このため近年，実用化のための検討が活発に行われており [5][6][7][8]，すでに 800°C まで使用できるものが実用化されている [9]。しかしながら，ナノ多孔質断熱材として代表的なフュームドシリカ粒子をベースとしたものは，800°C を超えるとナノ粒子が焼結して熱伝導率が急激に増大するとの報告もあり [10]…”

Section: 緒言unclassified

Effect of Heat Processing on the Thermal and Mechanical Properties of Fibrous Fumed Alumina Compacts

Tasaka¹,

Ohmura

Kondô

et al. 2021

Funtai Kogakkaishi

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In recent years, new thermal insulation materials with lower thermal conductivity and lightweight have been fabricated. However, due to the problems such as heat resistance, their practical use is limited to only below 1000°C. In this paper, the thermal insulation performance of fibrous fumed alumina compacts was evaluated by repeatedly measuring the thermal conductivity at temperatures up to 1200°C. As a result, it revealed that the compacts have low thermal conductivity of 0.040-0.065 W/(m•K) between 200°C and 1000°C. After receiving the heat processing up to 1200°C, its thermal conductivity rapidly increased. However, it was less than half of that of existing ceramic fiber insulation. The compressive strength and flexural strength also increased by the repeated heat processing. The increase of thermal conductivity by the repeated heat processing was explained by the increase of solid thermal flux due to the sintering of particles in the compact and the increase in thermal radiation flux due to the surface oxidation of SiC particles.

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Microstructure Control of Composite Porous Materials and its Application

Naito¹,

Abe²,

Kondô³

et al. 2013

J. Jpn. Soc. Powder Powder Metallurgy

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Fabrication and Evaluation of Thermal Insulation Materials by Using Nanoparticle/Fiber Composites for High Temperature

Cited by 4 publications

References 11 publications

Effect of mechanical processing on thermal and mechanical properties of fibrous fumed alumina compacts

Effect of mechanical processing on thermal and mechanical properties of fibrous fumed alumina compacts

Effect of Heat Processing on the Thermal and Mechanical Properties of Fibrous Fumed Alumina Compacts

Microstructure Control of Composite Porous Materials and its Application

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