Fabrication and properties of porous boron nitride/silicon oxynitride ceramic composites via gas pressure sintering

Lin, Shaojie; Ye, Feng; Ma, Jie; Ding, Junjie; Liu, Qiang; Dong, Shangli

doi:10.1016/j.matdes.2015.08.032

Cited by 24 publications

(14 citation statements)

References 29 publications

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“…On the other hand, the actual weight loss due to Si 2 N 2 O decomposition showed an increase trend with increase in the Li 2 O addition. According to our previous observations on the decomposition of the Si 2 N 2 O compound, it was assumable that the atomic diffusion in association with decomposition of the Si 2 N 2 O compound became easier when the Si 2 N 2 O crystals were wetted by a low viscous melt of Li 2 O–SiO 2 . The increase in the Li 2 O content reduced the viscosity of the melts to facilitate the Si 2 N 2 O decomposition.…”

Section: Resultsmentioning

confidence: 98%

“…13,14 On the other hand, the actual weight loss due to Si 2 N 2 O decomposition showed an increase trend with increase in the Li 2 O addition. According to our previous observations on the decomposition of the Si 2 N 2 O compound, 9,10 Figure 6A is the TG-DTA curve of the sample AL5.0 in air from room temperature up to 1200°C. The endothermic peak at~100°C was attributed to evaporation of the absorbed moisture.…”

Section: Weight Lossesmentioning

confidence: 83%

“…However, synthesis the Si 2 N 2 O is always problematic because it decomposes at around 1500°C and above. The formation of the Si 2 N 2 O compound from Si 3 N 4 and SiO 2 and the Si 2 N 2 O decomposition could be expressed by Reactions and …”

Section: Introductionmentioning

confidence: 99%

“…The formation of the Si 2 N 2 O compound from Si 3 N 4 and SiO 2 and the Si 2 N 2 O decomposition could be expressed by Reactions 1 and 2. 9,10 Si 3 N 4 (s) þ SiO 2 (s) ¼ 2Si 2…”

Section: Introductionmentioning

confidence: 99%

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Effects of pore diameters on phase, oxidation resistance, and thermal shock resistance of the porous Si₂N₂O ceramics

et al. 2017

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Porous silicon oxynitride (Si2N2O) ceramics were prepared by gas pressure sintering at 1650°C for 2 hour under 1.5 MPa N2 in two different powder beds, that is, h‐BN/Si3N4 or h‐BN/(Si3N4 + SiO2). Effects of the gaseous atmosphere in the powder bed and the pore diameter in the ceramics on formation of the Si2N2O phase and the oxidation resistance of the sintered porous ceramics were investigated. Results showed that presence of the gaseous SiO in the powder bed played a crucial role in suppressing decomposition of the Si2N2O phase at the outer surface of the material. Permeability of the gaseous substances was decreased when the pore diameter was small, to affect the phase composition and the oxidation behavior of the porous Si2N2O ceramics. The oxidation weight gain curves of the porous Si2N2O ceramics fitted the asymptotic law. No significant changes in the dielectric constant of the Si2N2O ceramics were observed after oxidation at 1000°C‐1200°C for up to 30 minutes, whereas the dielectric loss tangent was reduced by oxidation due to formation of SiO2. The as‐obtained porous Si2N2O ceramics could withstand a highest thermal shock of 1200°C when the outer surface could be sealed by the oxidation‐derived SiO2 layer.

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Section: Resultsmentioning

confidence: 98%

Section: Weight Lossesmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

“…The formation of the Si 2 N 2 O compound from Si 3 N 4 and SiO 2 and the Si 2 N 2 O decomposition could be expressed by Reactions 1 and 2. 9,10 Si 3 N 4 (s) þ SiO 2 (s) ¼ 2Si 2…”

Section: Introductionmentioning

confidence: 99%

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Effects of pore diameters on phase, oxidation resistance, and thermal shock resistance of the porous Si₂N₂O ceramics

et al. 2017

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“…In general, porous ceramics have better TSR and lower dielectric constant and loss than dense ceramics . The porous boron nitride/silicon oxynitride (BN/Si 2 N 2 O) ceramic composites are promising high temperature structural/functional material for radome or antenna window applications because of its good mechanical property, low density, high thermal stability, positive machinability, and outstanding dielectric property . However, little work has been done on the TSR of the porous BN/Si 2 N 2 O ceramic composites.…”

Section: Introductionmentioning

confidence: 99%

Thermal shock resistance of the porous boron nitride/silicon oxynitride ceramic composites

Sun

Cai

Yang

et al. 2018

Int J Applied Ceramic Tech

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The thermal shock resistance of the porous boron nitride/silicon oxynitride (BN/Si2N2O) ceramic composites were tested by the quenching‐strength method with temperature differences of 600‐1400°C. The residual flexural strength of the composites decreased with increasing temperature difference from 600°C to 900°C. This weakening in flexural strength was attributed to the formation of microcracks in the matrix caused by thermal stress damage. Afterward, as the formation of a dense oxidized layer sealed the surface and hindered further oxidation, the residual flexural strength increased with the further increase of temperature difference from 900°C to 1100°C. Finally, when the temperature differences were above 1100°C, the residual flexural strength gradually decreased with increasing temperature difference, which was attributed to the further oxidation and large thermal stress damage. And the thermal shock resistance of the porous BN/Si2N2O ceramic can be improved by the introduction of high contents of sintering aids and h‐BN.

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Fabrication of Si₂N₂O Ceramic Foam by Combination of Direct Ink Writing and Biological Foaming Techniques

Jin

Yang

et al. 2020

Adv Eng Mater

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Ceramic foams possess the advantages of high-melting point, wear resistance, corrosion resistance, and low density in comparison with conventional polymers or metals. [1,2] Many attempts, for example, partial sintering, [3] polymeric sponge method, [4] sacrificial template method, [5] and direct foaming method, [6] have been implemented to develop ceramic foams for the applications of filters, radiant burners, bioreactors, heat exchangers, and catalyst supports. [1] However, there are still some disadvantages, such as the expansion of ice crystals in water-based systems and contraction of organic solvents during freeze forming, cracking of reticulated structure during pyrolysis of the polymeric template, and the toxicity and high cost of organic additives. [2,7] These will affect the stability of foams and practicability of preparation methods. The direct consolidation techniques based on the gelling of organic monomer [5] and several natural raw materials, such as starch, [7] proteins, or ovalbumin, [8] were proposed to improve strength of green body. Furthermore, these natural raw materials are cheap, environmentally friendly and easy to burn out. However, the preparation of the green body requires a heating crosslinking process, [1] and large amounts of pore-forming agents are needed to ensure high porosity. [7] Biological foaming (BF) technique could utilize small amounts of nutrients to release gases to form a lot of bubbles in the ceramic slurry. [7] The content of BF agent and the balance of bubble pressure and resistance of slurry determined the density of pore and pore size. Menchavez and Intong [7] combined direct consolidation technique with BF technique to fabricate red-clay-based ceramic with porosities from 17% to 70%. The starch was adopted as a growth substrate for yeast cell and a binder for ceramic particles. However, relatively complex consolidation process was inevitable due to gelatinization characteristics of starch. This method was designed and implemented on the basis of stable slurry. Thus, it has the potential to be applied to direct ink writing (DIW) technique by designing BF inks with suitable rheological properties. DIW, as a 3D printing technique, directly utilizes pastes or precursors with shear thinning characteristic to build complex geometries. [9,10] Minas et al. [11] and Muth et al. [12] have successfully utilized particle-stabilized foams to 3D print hierarchical porous ceramics, respectively. This strategy eliminates the need to manufacture moulds for custom components and shortens the cycle time from design to production. Si 2 N 2 O ceramic is a promising ceramic for high-temperature applications due to its low density, outstanding strength, superior thermal stability, and oxidation resistance. [13,14] Therefore, it is expected to be applied to high-temperature gas/liquid filters, thermal insulators or engineering components, separation membranes, catalyst carriers, etc. Herein, we report a versatile and simple strategy for the design and preparation of BF ink to fabricate h...

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Fabrication and properties of porous boron nitride/silicon oxynitride ceramic composites via gas pressure sintering

Cited by 24 publications

References 29 publications

Effects of pore diameters on phase, oxidation resistance, and thermal shock resistance of the porous Si₂N₂O ceramics

Effects of pore diameters on phase, oxidation resistance, and thermal shock resistance of the porous Si₂N₂O ceramics

Thermal shock resistance of the porous boron nitride/silicon oxynitride ceramic composites

Fabrication of Si₂N₂O Ceramic Foam by Combination of Direct Ink Writing and Biological Foaming Techniques

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Fabrication and properties of porous boron nitride/silicon oxynitride ceramic composites via gas pressure sintering

Cited by 24 publications

References 29 publications

Effects of pore diameters on phase, oxidation resistance, and thermal shock resistance of the porous Si2N2O ceramics

Effects of pore diameters on phase, oxidation resistance, and thermal shock resistance of the porous Si2N2O ceramics

Thermal shock resistance of the porous boron nitride/silicon oxynitride ceramic composites

Fabrication of Si2N2O Ceramic Foam by Combination of Direct Ink Writing and Biological Foaming Techniques

Contact Info

Product

Resources

About

Effects of pore diameters on phase, oxidation resistance, and thermal shock resistance of the porous Si₂N₂O ceramics

Effects of pore diameters on phase, oxidation resistance, and thermal shock resistance of the porous Si₂N₂O ceramics

Fabrication of Si₂N₂O Ceramic Foam by Combination of Direct Ink Writing and Biological Foaming Techniques