Mechanical, dielectric properties and thermal shock resistance of porous silicon oxynitride ceramics by gas pressure sintering

Lin, Shaojie; Ye, Feng; Dong, Shangli; Ma, Jie; Zhang, Biao; Ding, Junjie

doi:10.1016/j.msea.2015.03.064

Cited by 29 publications

(21 citation statements)

References 23 publications

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“…There is a difference between the grain size of the β-eucryptite in LAS materials(5)(6) μm) and that obtained in the LAS/Al 2 O 3 composite (2-3 μm). Alumina, homogeneously dispersed in the LAS matrix, acted as an inhibitor of β-eucryptite grain size, even at very low sintering temperatures (1100 °C).…”

mentioning

confidence: 86%

High thermal stability of microwave sintered low-εr β-eucryptite materials

Benavente

Salvador

Peñaranda‐Foix

et al. 2015

Ceramics International

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Low-temperature sinterable microwave LiAlSiO 4 -based solid-state material was investigated with regard to microwave dielectric properties as functions of the sintering temperature. β-eucryptite materials and alumina-reinforced β-eucryptite composites were sintered by microwave technology at 1100 ºC and 1200 °C. The combination of fast heating and the dramatic reduction in cycle time, along with the non-conventional heating source, opens the way to produce materials with desired multifunctional properties. 2The microstructure and crystalline composition of the materials were characterised, and the mechanical, thermal and microwave dielectric behaviours were analyzed. X-ray diffraction showed good chemical stability in materials without between-phase reactions during the microwave sintering process. The excellent mechanical (~8 GPa of hardness and ~100 GPa of Young's modulus), thermal (-0.23·10 -6 K -1 ) and microwave dielectric properties (ε r = 4.10; Q = 1494) were obtained from the LAS/Al 2 O 3 composites sintered at a very low temperature (1100 ºC). The results achieved show the possibility of designing ceramic nanocomposites at low sintering temperatures using microwave technology with near-zero thermal expansion coefficients, high mechanical and chemical stability and low dielectric properties.

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mentioning

confidence: 86%

High thermal stability of microwave sintered low-εr β-eucryptite materials

Benavente

Salvador

Peñaranda‐Foix

et al. 2015

Ceramics International

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“…With the increase of Li 2 O in starting materials, the diffraction peak intensities of β-Si 3 N 4 increased apparently. β-Si 3 N 4 was produced by the decomposition of Si 2 N 2 O, which was thermaldynamically easier in the liquid rich environment and accelerated by increasing the Li 2 O content [11]. The formation and decomposition reactions of Si 2 N 2 O could be described in the following equations [21,22]:…”

Section: Phase Assemblagesmentioning

confidence: 99%

“…This comparison proved that the oxidation at high temperatures is the main mechanism of strength failure. Being exposed to an oxidizing atmosphere, the network of porous Si 2 N 2 O ceramics would be damaged if the oxidation derived SiO 2 layer cannot seal the surface and stop the internal oxidation [11]. The porosity of L 5.0 BN 12.5 and L 5.0 BN 15.0 was higher and their surfaces were difficult to be sealed, so they experienced a drastic strength degradation above 900°C.…”

Section: Thermal Shock Resistancementioning

confidence: 99%

“…However, the as-sintered dense bodies showed poor thermal shock resistance (critical temperature difference ΔT c = 600°C), and the dielectric constant (ε = 6.17) is still too high for use in broadband missile antenna shield [8][9][10]. Our previous work showed that the porous Si 2 N 2 O ceramics obtained by gas pressure sintering (GPS) possess high strength, excellent thermal shock resistance (ΔT c = 1200-1300°C) and improved dielectric properties (ε b 4.59, tanδ b 0.0049) [11], however, the processability of the asobtained specimen is not satisfied. For instance, the hardness reached 4.5-6.2 GPa and requires 20-25 min to cut down a rectangular bar (3 mm × 4 mm × 36 mm) using diamond blade.…”

Section: Introductionmentioning

confidence: 99%

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

Lin

et al. 2015

Materials & Design

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“…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%

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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Mechanical, dielectric properties and thermal shock resistance of porous silicon oxynitride ceramics by gas pressure sintering

Cited by 29 publications

References 23 publications

High thermal stability of microwave sintered low-εr β-eucryptite materials

High thermal stability of microwave sintered low-εr β-eucryptite materials

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

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

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Mechanical, dielectric properties and thermal shock resistance of porous silicon oxynitride ceramics by gas pressure sintering

Cited by 29 publications

References 23 publications

High thermal stability of microwave sintered low-εr β-eucryptite materials

High thermal stability of microwave sintered low-εr β-eucryptite materials

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

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

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