Mechanical characterization of highly porous β-Si3N4 ceramics fabricated via partial sintering &amp; starch addition

Kalemtaş, Ayşe; Topateş, Gülsüm; Özcoban, Hüseyin; Mandal, Hasan; Kara, Ferhat; Janßen, Rolf

doi:10.1016/j.jeurceramsoc.2012.10.036

Cited by 62 publications

(22 citation statements)

References 51 publications

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“…With the content of starch increasing from 0wt% to 20wt%, the porosity of Si3N4 ceramics changed slightly from 53% to 60%. Similar results were also founded in other studies . It indicated that a wide porosity cannot be obtained with the addition of low content of starch.…”

Section: Resultssupporting

confidence: 90%

“…With the addition of 20wt% starch, a wider pore size distribution was obtained; however, the mean pore diameter slightly changed from 0.9 to 1.2 μm and there was no sign of bimodal pore size distribution caused by interlocking β‐Si 3 N 4 grains and the removal of starch, which can be seen in Fig. c and d. The difference between the results was attributed to the working principle of the mercury porosimetry, which reveals the smallest constricted size of the pores even if larger pores are present in the depths of the smallest constrictions …”

Section: Resultsmentioning

confidence: 89%

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The Microstructure and Mechanical Properties of Porous Silicon Nitride Ceramics Prepared via Novel Aqueous Gelcasting

Wan

Yao

Yin

et al. 2015

Int J Applied Ceramic Tech

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A novel aqueous gelcasting technique was employed to prepare porous silicon nitride ceramics using water-soluble copolymer of isobutylene and maleic anhydride (Isobam) as both dispersant and gelling agent. The effects of fabrication parameters, including sintering additives, the second phase (BN), and pore-forming agent (corn starch), on the microstructure and mechanical properties were separately investigated. The sample with Yb 2 O 3 as sintering additive, having a porosity of~48.6%, showed a high flexural strength of 233MPa and a high fracture toughness of 2.72 MPaÁm 1/2 . With addition of 2.5wt% BN, the sample exhibited a high flexural strength of 211 MPa due to the uniform microstructure with b-Si 3 N 4 grains. A high porosity of~60% and a flexural strength of 110 MPa were obtained by adding 20wt% starch into the sample.

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Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 89%

The Microstructure and Mechanical Properties of Porous Silicon Nitride Ceramics Prepared via Novel Aqueous Gelcasting

Wan

Yao

Yin

et al. 2015

Int J Applied Ceramic Tech

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“…Silicon nitride (Si 3 N 4 ) ceramics are of great scientific and technological interest due to their increasing widespread applications including bioreactors, catalyst carriers, metal-ceramic thermal engineering composites, separation membranes, and thermal insulators. 81 Silicon nitride submicron-diameter tubes and rods have been prepared by pyrolysis of wheat husk at a temperature of 1300-1450°C. 82 It was determined that the ceramics produced at 1300°C exhibited the formation of hexagonal α phase of Si 3 N 4 , whereas both α and β phases were formed at 1400°C.…”

Section: Silicon Nitridementioning

confidence: 99%

Review on a novel biosilica source for production of advanced silica‐based materials: Wheat husk

Terzioğlu

Yücel

Kuş

2018

Asia-Pacific J Chem Eng

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The growing cognizance of environmental matters elucidates the increasing attention thought the evaluation of bio‐based by‐products and waste materials in various applications. The agricultural‐based industry results in considerable amounts of residues containing silica. In the past decade, extensive research studies had been executed to evaluate agricultural waste materials such as rice husk and rice straw. The results of the studies point out the possibility of evaluating such wastes to produce silica‐based materials. Wheat husk is such an abundantly available waste obtained from the wheat milling process. It is containing noncrystalline silica, and thus, it can also be evaluated to produce value added materials. This study presents a comprehensive overview of the researches carried out on the properties and utilization of wheat husk as a silica source. The summary and discussion presented in this review would provide knowledge on wheat husk that is convenient to be utilized for the low‐cost and sustainable production of silica‐based materials such as aerogel, metal silicates, zeolite, silica‐based ceramics, and composites.

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“…[12] Another straightforward approach is partial sintering, where the sintering process is halted before full densification, thus retaining an open-porous pore network between partially connected Si 3 N 4 particles in the final material. [13] A distinct advantage of this approach is the possibility to combine it with colloidal processing strategies such as slip-casting [14] or gelcasting. [15,16] These techniques allow for the fabrication of complexshaped structures, an important requirement for potential applicability: in most previous reports on porous Si 3 N 4 ceramics, only simple geometries were obtained, thus limiting the applicability due to a decreased functional surface.…”

Section: Introductionmentioning

confidence: 99%

Open‐Porous Silicon Nitride‐Based Ceramics in Tubular Geometry Obtained by Slip‐Casting and Gelcasting

Brouczek

Konegger

2017

Adv Eng Mater

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Owing to its unique properties, silicon nitride is a frequently used materials choice in highly demanding applications in terms of thermal and mechanical load. In this work, porous silicon nitride-based support materials in hollowtube configuration are generated through colloidal forming, and their respective properties for potential applications in the fields of membranebased separation, filtration, or catalysis are evaluated. Shaping of the ceramics is achieved by two distinct casting techniques, slip-casting, and gelcasting, and the results of the respective methods are set in relation. Furthermore, a special focus is set on the correlation between sintering parameters and resulting porosity. Subsequently, air permeabilities of the generated structures are determined, illustrating a direct relation between processing parameters and resulting permeability. Darcian permeability values of up to 9 Á 10 À16 m 2 are observed for samples exhibiting total porosities between 32 and 41 %. The findings allow for a predictability of suitable permeation properties for the structures' anticipated application as complex-shaped non-oxide ceramic supports for membrane-based separation or catalysis, or as high-performance filter materials.

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Mechanical characterization of highly porous β-Si3N4 ceramics fabricated via partial sintering & starch addition

Cited by 62 publications

References 51 publications

The Microstructure and Mechanical Properties of Porous Silicon Nitride Ceramics Prepared via Novel Aqueous Gelcasting

The Microstructure and Mechanical Properties of Porous Silicon Nitride Ceramics Prepared via Novel Aqueous Gelcasting

Review on a novel biosilica source for production of advanced silica‐based materials: Wheat husk

Open‐Porous Silicon Nitride‐Based Ceramics in Tubular Geometry Obtained by Slip‐Casting and Gelcasting

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