Thermal shock behavior of 30wt%BAS/Si3N4 self-reinforced composite

Ye, Feng; Liu, Limeng; Zhang, Haijiao; Wen, Baosan

doi:10.1016/j.jallcom.2009.12.078

Cited by 19 publications

(8 citation statements)

References 23 publications

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Section: Resultsmentioning

confidence: 94%

“…Several researchers reported that a dense SiO 2 layer formed by oxidation on outer surface could acted as a thermal barrier which effectively decreased the cooling rate and the intensity of thermal shock, thus enhanced the thermal shock resistance. 28,29 In the samples AL7.5 and AL 10.0 where the porosity and the diameter of the pore channel were small, the outer surfaces of the samples were sealed quickly In contrast, in the samples where the porosity and the diameters of the pore channel were large, such as the sample AL2.5 and AL5.0, it was difficult for the oxidation-derived SiO 2 to form a protective SiO 2 sealant layer in a short time of 5 minutes, as shown in Figure 10A and B. In addition, the water might flow into the porous ceramic quickly through the open pores and the cooling rate was too high, so microcracks were observed on surface.…”

Section: Effects Of Oxidation On Dielectric Properties Of the Poroumentioning

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: 94%

Section: Effects Of Oxidation On Dielectric Properties Of the Poroumentioning

confidence: 99%

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

et al. 2017

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“…Compared with the original surface morphology of the coating (Figure A), it is found that a dense glass layer was formed on the coating surface. During thermal cycling at high temperature, Si 3 N 4 particles exposed on the coating surface are easily oxidized into SiO 2 glass . By the cumulative thermal cycling, quantity of the SiO 2 glass gradually increased, thus a SiO 2 glass layer present on the coating surface.…”

Section: Discussion and Analysismentioning

confidence: 99%

Fabrication, thermal shock resistance, and dielectric property of α‐Si₃N₄‐based ceramic coating on porous Si₃N₄ ceramics

Wang

Xia

Qiao

et al. 2019

Int J Applied Ceramic Tech

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A dense α-Si 3 N 4 -based ceramic protective coating was successfully prepared on porous Si 3 N 4 ceramics by a liquid infiltration and filling method. The coating composed of a primary α-Si 3 N 4 phase and secondary O'-Sialon, β-Sialon, and Y-Si-Al-O-N glass phase. After thermal shock at ΔT = 1000°C for five times, cracks were produced, but the tip of crack stopped inside the coating; so the coated porous Si 3 N 4 ceramics still had a good waterproof ability and its water absorption was only 7%. During thermal shock, toughening mechanisms involving needle-like O'-Sialon particle bridging, crack deflection, and rough fracture, occurred within the cracks, contributing to thermal shock resistance of the coating. The dielectric constant of the coated porous Si 3 N 4 ceramics showed a slow increase trend with increasing temperature, and it reached the maximum value of 3.57 at 1100°C at the frequency of 11 GHz. The dielectric loss increased slowly as the temperature increased from room temperature to 900°C, but it started to increase evidently when the temperature was over 900°C. K E Y W O R D Scoating, dielectric properties, porous Si 3 N 4 ceramics, thermal shock resistance

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“…Though incomparable with the extensive report on the thermal shock behavior of dense Si 3 N 4 ceramics and Si 3 N 4 based composites, the investigation of thermal shock behavior of porous Si 3 N 4 ceramics had already received attention for decades as well. For example, She et al reported the effect of porosity and grain morphology on the initiation and growth of cracks under thermal shock conditions .…”

Section: Introductionmentioning

confidence: 99%

Thermal shock behavior of porous Si₃N₄ ceramics with Nd₂O₃as sintering additive

Liang

Yin

Zuo

et al. 2019

Int J Applied Ceramic Tech

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The thermal shock behavior of porous Si 3 N 4 ceramics with Nd 2 O 3 as sintering additive was investigated by the water quenching method in the temperature difference range from 200 to 1500°C. The porosity and residual flexural strength of the specimens after single water quenching were measured to reveal the influence of thermal shock on porous Si 3 N 4 ceramics. It was found that the critical temperature was 780°C, which was almost 230°C higher than its dense counterpart reported by other researchers. Scanning electron microscope was used to examine the microstructure evolution of the external surface and interior after water quenching. Surface oxidation and cracks formation were found to be the primary cause of the strength degradation of porous Si 3 N 4 ceramics. The phase composition variation in the surface was also characterized by X-ray diffraction.

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Thermal shock behavior of 30wt%BAS/Si3N4 self-reinforced composite

Cited by 19 publications

References 23 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

Fabrication, thermal shock resistance, and dielectric property of α‐Si₃N₄‐based ceramic coating on porous Si₃N₄ ceramics

Thermal shock behavior of porous Si₃N₄ ceramics with Nd₂O₃as sintering additive

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Thermal shock behavior of 30wt%BAS/Si3N4 self-reinforced composite

Cited by 19 publications

References 23 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

Fabrication, thermal shock resistance, and dielectric property of α‐Si3N4‐based ceramic coating on porous Si3N4 ceramics

Thermal shock behavior of porous Si3N4 ceramics with Nd2O3 as sintering additive

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, thermal shock resistance, and dielectric property of α‐Si₃N₄‐based ceramic coating on porous Si₃N₄ ceramics

Thermal shock behavior of porous Si₃N₄ ceramics with Nd₂O₃as sintering additive