Effect of large β-Si3N4 particles on the thermal conductivity of β-Si3N4 ceramics

Yokota, Hiroshi; Yamada, Shinya; Ibukiyama, Masahiro

doi:10.1016/s0955-2219(02)00291-1

Cited by 31 publications

(22 citation statements)

References 16 publications

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“…Many studies have shown that the thermal conductivity of ␤-Si 3 N 4 ceramics indeed increases with increasing amount of purified large grains. 23,24 Therefore, one reason why sample RYbM shows higher thermal diffusivity/conductivity than sample RYM is related to the larger overall grain size. Also, Si 3 N 4 ceramics is actually a multiphase system consisting of Si 3 N 4 grains and secondary phases.…”

Section: Sintering Secondary Phases and Microstructurementioning

confidence: 99%

Effects of processing method and additive composition on microstructure and thermal conductivity of Si3N4 ceramics

Zhu

Zhou

Hirao

2006

Journal of the European Ceramic Society

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Section: Sintering Secondary Phases and Microstructurementioning

confidence: 99%

Effects of processing method and additive composition on microstructure and thermal conductivity of Si3N4 ceramics

Zhu

Zhou

Hirao

2006

Journal of the European Ceramic Society

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“…In this research, we chose the Maxwell–Eucken relation to calculate the effective thermal conductivity of highly porous Si 3 N 4 foam, because it has been successfully by many researchers . The Maxwell–Eucken relation can be expressed as following:

λ = λ_{s} \frac{λ_{p} + 2 λ_{s} + 2 ν_{p} ({normalλ}_{p} - {normalλ}_{s})}{λ_{p} + 2 λ_{s} - normalν ({normalλ}_{p} - {normalλ}_{s})}

where λ, λ s , and λ p are the thermal conductivity of porous material, thermal conductivity of solid phase, thermal conductivity of the pore (namely air), respectively. In addition, ν p is the porosity of the porous material.…”

Section: Resultsmentioning

confidence: 99%

“…Si 3 N 4 is a kind of ceramic with high thermal conductivity. The reported thermal conductivities of Si 3 N 4 are generally in the range of 20–150 W/(m·K), depending on the fabricating route .…”

Section: Resultsmentioning

confidence: 99%

Highly Porous Silicon Nitride Foam Prepared Using a Route Similar to the Making of Aerated Food

Yin

Zhou

et al. 2015

Int J Applied Ceramic Tech

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A new foaming route, which was imitated from the foaming of aerated foods, was used by the protein foaming method in preparing highly porous silicon nitride (Si 3 N 4 ) foams. Effects of air fraction on the structure and property of the products were investigated. It was indicated that the porosity increased with the air fraction exponentially, whereas the air fraction had little effect on the average pore sizes of Si 3 N 4 foams. Thermal conductivity of the product measured using the laser flash method decreased from 4.07 to 2.29 W/(mÁK) when the porosity increased from 80.00% to 87.61%.

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“…Recently, Yokota et al 6 concluded that grain growth could improve thermal conductivity due to the volumetric increase of purified large b-Si 3 N 4 grains. They also concluded that the amount of dissolved oxygen in Si 3 N 4 crystalline lattice lattice oxygen content controls the thermal conductivity of b-Si 3 N 4 ceramics.…”

Section: -12mentioning

confidence: 99%

Effect of Post-Sintering Heat-Treatment on Thermal Conductivity of Si3N4 Ceramics Containing Different Additives

Wasanapiarnpong

Wada

Imai

et al. 2005

J. Ceram. Soc. Japan

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as sintering aids, following by gas-pressured sintering at a temperature of 2123 K for 2 h under a nitrogen gas pressure of 1.0 MPa with Si 3 N 4 BN packing powder. Subsequently, these specimens were heat-treated at a temperature up to 2223 K for 8 h under a nitrogen gas pressure of 1.0 MPa without any packing powder. Mass loss, density, oxygen content and thermal conductivity of the specimens before and after the post-sintering heat-treatment were measured. Due to the heat-treatment, the reduction of oxygen content, via the reaction of Si 3 N 4 and SiO 2 , without decrease of relative density was found to be effective in improving thermal conductivity of the Si 3 N 4 ceramics sintered with Y 2 O 3 -SiO 2 additives. The effect of post-sintering heat-treatment was not significant for the Si 3 N 4 specimen sintered with Y 2 O 3 -Al 2 O 3 additives due to formation of SiAlON. Thermal conductivity of one of the former specimens reached 84 WmெK at room temperature.

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Effect of large β-Si3N4 particles on the thermal conductivity of β-Si3N4 ceramics

Cited by 31 publications

References 16 publications

Effects of processing method and additive composition on microstructure and thermal conductivity of Si3N4 ceramics

Effects of processing method and additive composition on microstructure and thermal conductivity of Si3N4 ceramics

Highly Porous Silicon Nitride Foam Prepared Using a Route Similar to the Making of Aerated Food

Effect of Post-Sintering Heat-Treatment on Thermal Conductivity of Si3N4 Ceramics Containing Different Additives

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