Fabrication and Characterization of In Situ Porous <scp>S</scp>i3<scp>N</scp>4‐<scp>S</scp>i2<scp>N</scp>2<scp>O</scp>‐<scp>BN</scp> Ceramic

Wang, Shengjin; Yang, Zhihua; Duan, Xiaoming; Jia, Dechang; Ma, Fei‐Xiang; Sun, Boqian; Zhou, Yu

doi:10.1111/ijac.12134

Cited by 21 publications

(10 citation statements)

References 33 publications

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“…In general, the mechanical properties of porous ceramics are related to the porosities, the microstructure and the phase compositions. 49) For porous alumina samples using graphite waste and yeast as a pore-forming agent, the hardness decreases with increasing poreforming agent content. While the hardness of porous alumina ceramics with rice husk ash decreases at 20% and continues to increase at 30 and 50%, due to the formation of the ceramic phases mullite, cristobalite and sillimanite which have high a hardness value.…”

Section: )31)mentioning

confidence: 99%

Preparation and characterization of porous alumina ceramics using different pore agents

Ali

Hanim

Tahir

et al. 2017

J. Ceram. Soc. Japan

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Graphite waste from primary batteries, active yeast and commercial rice husk ash have been used as pore-forming agents to fabricate porous alumina ceramics using a fugitive materials technique. The pore-forming agent ratios were between 10 to 50 wt %. The effects of the pore-forming agent ratios on the mechanical properties, the porosity and the microstructure have been investigated in this study. The results showed that through increasing the pore-forming agent ratio for graphite waste, yeast and rice husk ash, the porosity increased from 37.3 to 61.1%, 30.2 to 63.8% and 42.9 to 49.0%, respectively. The hardness also decreased from 172.6 to 38.1 HV 1 and from 160.6 to 15.0 HV 1 for porous alumina ceramics using graphite waste and yeast as pore-forming agents, respectively. However, the hardness of the porous alumina ceramics with rice husk ash as a pore-forming agent increased at 30 wt % (150.9 HV 1 ) and 50 wt % (158.9 HV 1 ). The tensile strength for porous alumina ceramics using graphite waste and yeast as pore-forming agents decreased from 24.9 to 14.3 MPa and from 26.2 to 5.4 MPa. The compressive strength decreased from 112.3 to 34.3 MPa and from 19.5 to 1.8 MPa, respectively. However, for porous alumina ceramics using rice husk ash, the tensile strength increased at 30 wt % (24.1 MPa) and 50 wt % (21.9 MPa). The compressive strength also increased at 30 wt % (69.7 MPa) and at 50% (60.1 MPa).

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Section: )31)mentioning

confidence: 99%

Preparation and characterization of porous alumina ceramics using different pore agents

Ali

Hanim

Tahir

et al. 2017

J. Ceram. Soc. Japan

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“…In thus a way the improvement of mechanical strength of the obtained porous Si 3 N 4 ceramics could be achieved. As shown in Table , with the same porosity level around 48%, it is fascinating to note the flexural strength of Si 3 N 4 ceramics prepared via dispersant reaction method (108.30 ± 3.84 MPa) are improved by an order of magnitude, in comparison to that prepared via gelcasting method (8.80 ± 1.39 MPa) . In addition, the present work imparts porous Si 3 N 4 ceramic extremely high fracture toughness of 2.45 ± 0.03 MPa · m 1/2 (with porosity of 48.2 ± 1.2%), which is much higher than the previously reported values (see Table ).…”

Section: Resultsmentioning

confidence: 87%

Si₃N₄ Hollow Microsphere Toughened Porous Ceramics from Direct Coagulation Method via Dispersant Reaction

et al. 2018

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In order to realize the toughening effect of Si 3 N 4 hollow microsphere, direct coagulation casting method via dispersant reaction is utilized to form porous green bodies of Si 3 N 4 ceramics for the first time. It is found that the combination state between Si 3 N 4 hollow microsphere and ceramic matrix is enhanced due to its superiority on the coagulation mechanism. This novel colloidal forming method efficiently contributes to the close contact between hollow microspheres and ceramic particles, leading to the improvement of interface strength between the pore-former and ceramic matrix. More importantly, it is proved that ceramic hollow microspheres could well perform as both pore-former and toughening phase. The porosity regulation of porous ceramics is realized by tailoring ludox and carbon amount through carbothermal reduction method. This method turns out to regulate the performance of porous ceramics better especially through the sintering parameters. Porous Si 3 N 4 ceramics prepared with 5 wt% ludox addition which are treated in argon at 1400 C possesses the optimal performance. They possess the fracture toughness of 2.45 MPa Á m 1/2 , dielectric constant of 3.49, and thermal conductivity of 2.57 W/(m Á K), which have promising applications in radome materials. Figure 6. SEM images of porous Si 3 N 4 ceramics fabricated by (a) gelcasting and (c) dispersant reaction method, the corresponding interfaces between Si 3 N 4 hollow microspheres and matrix are shown in (b) and (d), respectively; their relevant fracture paths are shown in (e) and (f), respectively.

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“…BN is an atomic crystal and is stable in the N 2 atmosphere. BN is able to absorb the oxygen released by other compounds . Therefore, when BN is added into the sample, Bi 2 O 3 of BBSZ glass is converted into Bi due to its oxygen being absorbed by BN at 850 °C.…”

Section: Resultsmentioning

confidence: 99%

High Performance of Low‐Temperature‐Cofired Ceramic with Al₂O₃/BN Biphasic Ceramics Based on B₂O₃–Bi₂O₃–SiO₂–ZnO Glass

et al. 2020

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With the rapid development of microelectronic information technology, highpower electronic devices require high heat dissipation. Herein, the preparation of low-temperature cofired ceramic (LTCC) applications with excellent thermal conductivity and dielectric properties is focused. B 2 O 3 -Bi 2 O 3 -SiO 2 -ZnO (BBSZ) glass/Al 2 O 3 /BN green sheets are prepared by tape casting and sintered at 850 C. The crystal phase composition, microstructure, thermal conductivity, thermal expansion coefficient, and dielectric properties of LTCC are investigated. It is shown that nanoscale rod crystals ZnAl 2 O 4 and Bi are formed in the composite. The generated nanoscale rod crystals build a 3D heat conduction channel in the composite. The thermal conductivity of the sintered sheet with 20 wt% BN is 5.165 W m À1 K À1 . The sintered sheet containing 20 wt% BN has a low coefficient of thermal expansion (2.92 ppm C À1 ) matched well with silicon and excellent dielectric properties (ε r ¼ 3.9672, tan δ ¼ 1.49 Â 10 À3 ) at 20 GHz. This material has great potential applications in electronic devices.

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Fabrication and Characterization of In Situ Porous Si₃N₄‐Si₂N₂O‐BN Ceramic

Cited by 21 publications

References 33 publications

Preparation and characterization of porous alumina ceramics using different pore agents

Preparation and characterization of porous alumina ceramics using different pore agents

Si₃N₄ Hollow Microsphere Toughened Porous Ceramics from Direct Coagulation Method via Dispersant Reaction

High Performance of Low‐Temperature‐Cofired Ceramic with Al₂O₃/BN Biphasic Ceramics Based on B₂O₃–Bi₂O₃–SiO₂–ZnO Glass

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Fabrication and Characterization of In Situ Porous Si3N4‐Si2N2O‐BN Ceramic

Cited by 21 publications

References 33 publications

Preparation and characterization of porous alumina ceramics using different pore agents

Preparation and characterization of porous alumina ceramics using different pore agents

Si3N4 Hollow Microsphere Toughened Porous Ceramics from Direct Coagulation Method via Dispersant Reaction

High Performance of Low‐Temperature‐Cofired Ceramic with Al2O3/BN Biphasic Ceramics Based on B2O3–Bi2O3–SiO2–ZnO Glass

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Product

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Fabrication and Characterization of In Situ Porous Si₃N₄‐Si₂N₂O‐BN Ceramic

Si₃N₄ Hollow Microsphere Toughened Porous Ceramics from Direct Coagulation Method via Dispersant Reaction

High Performance of Low‐Temperature‐Cofired Ceramic with Al₂O₃/BN Biphasic Ceramics Based on B₂O₃–Bi₂O₃–SiO₂–ZnO Glass