Chemical reactivity of hot-pressed Si3N4–ZrB2 ceramics at 1500–1700 °C

Guo, Wei‐Ming; Wu, Li‐Xiang; Ma, Tao; Gu, Shang-Xian; You, Yang; Lin, Hua‐Tay; Wu, Shanghua; Zhang, Guojun

doi:10.1016/j.jeurceramsoc.2015.04.031

Cited by 28 publications

(12 citation statements)

References 20 publications

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“…The heat treatment led to further reactions in Si 3 N 4 –ZrB 2 ceramics. Previous study has shown that the formation of ZrSi 2 phase at 1550°C was attributed to the following reaction:

3 Zr {normalB}_{2} (normals) + 2 Si (normals) + 4 {normalN}_{2} (normalg) \to 2 ZrN (normals) + 6 BN (normals) + ZrS {normali}_{2} (normals)

where Si resulted from the decomposition of Si 3 N 4 , and N 2 was provided by atmosphere and decomposition of Si 3 N 4 . The ZrB 2 phase in heat‐treated SZAYb sample became much weaker than that in heat‐treated SZMYb sample.…”

Section: Resultsmentioning

confidence: 99%

“…In addition to ZrB 2 phase, secondary ZrN phase was detected in Si 3 N 4 –ZrB 2 ceramics. Recent study showed that the formation of ZrN was due to the reaction of ZrB 2 with N 2 which was provided by atmosphere and decomposition of Si 3 N 4 at 1500°C or above:

2 Zr {normalB}_{2} (normals) + 3 {normalN}_{2} (normalg) \to 2 ZrN (normals) + 4 BN (normals)

…”

Section: Resultsmentioning

confidence: 99%

“…It is expected that ZrB 2 as second phase could further improve the mechanical properties and electrical conductivity of Si 3 N 4 ceramics . Recently, Guo et al have reported that ZrB 2 would react with Si 3 N 4 above 1500°C . So, it will be important to obtain dense Si 3 N 4 –ZrB 2 ceramics with no reaction.…”

Section: Introductionmentioning

confidence: 99%

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Densification and Thermal Stability of Hot‐Pressed Si₃N₄–ZrB₂ Ceramics

Guo

You

et al. 2015

J. Am. Ceram. Soc.

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Densification and thermal stability of hot‐pressed Si3N4–ZrB2 ceramics with and without additives were investigated in N2 atmosphere. The addition of MgO–Yb2O3, MgO–Y2O3, and Al2O3–Yb2O3 resulted in significant increase in relative density of the ceramics hot‐pressed at 1500°C from 48.5% to 98.0%, 97.3%, and 95.6%, respectively. There was weak reaction of ZrB2 with N2 to form ZrN in hot‐pressed ceramics. Then heat treatment at 1550°C resulted in the further reactions to produce ZrN, ZrSi2, and BN. The Si3N4–ZrB2 ceramics with MgO–Yb2O3 showed much better thermal stability as compared to the ceramics with Al2O3–Yb2O3. The small difference in density led to the obvious difference in thermal stability. Therefore, Si3N4–ZrB2 ceramics should be densified to full density, to obtain high thermal stability.

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“…The heat treatment led to further reactions in Si 3 N 4 –ZrB 2 ceramics. Previous study has shown that the formation of ZrSi 2 phase at 1550°C was attributed to the following reaction:

3 Zr {normalB}_{2} (normals) + 2 Si (normals) + 4 {normalN}_{2} (normalg) \to 2 ZrN (normals) + 6 BN (normals) + ZrS {normali}_{2} (normals)

Section: Resultsmentioning

confidence: 99%

2 Zr {normalB}_{2} (normals) + 3 {normalN}_{2} (normalg) \to 2 ZrN (normals) + 4 BN (normals)

…”

Section: Resultsmentioning

confidence: 99%

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Densification and Thermal Stability of Hot‐Pressed Si₃N₄–ZrB₂ Ceramics

Guo

You

et al. 2015

J. Am. Ceram. Soc.

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“…Based on previous research [19], it is determined that a reaction between Si 3 N 4 and ZrB 2 occurs in the N 2 atmosphere. When the temperature is more than 1500°C, ZrB 2 will react with N 2 to form the ZrN and BN phases in accordance with the following equation:…”

Section: Resultsmentioning

confidence: 99%

Effects of ZrB₂ addition on texture development and properties of porous Si₃N₄-ZrB₂ composites by magnetic field alignment

Yang

Zhao

Wang

et al. 2019

Journal of Asian Ceramic Societies

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“…Various metal oxides such as lanthanide oxides and rare earth oxides were used as sintering additives. Conventional sintering techniques, such as pressureless sintering [12], reaction bonding sintering [13], gas pressure sintering [14], hot pressing sintering [15] and hot isostatic pressing sintering etc. [16], usually need high sintering temperature, slow heating rate and long holding time to obtain fully dense materials and fabricate silicon nitride ceramics with sintering additives.…”

Section: Introductionmentioning

confidence: 99%

Improved mechanical properties of dense β-Si3N4 ceramics fabricated by spark plasma sintering with Al2O3-YSZ additives

Gao

et al. 2018

PAC

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In this work the influence of sintering conditions on structure and mechanical properties of Si3N4 ceramics was investigated. Nearly full dense β-Si 3 N 4 ceramics with excellent mechanical properties and interlock microstructure of elongated grains was fabricated using Al 2 O 3 and yttria-stabilized zirconia (YSZ with 3 mol% Y 2 O 3) as sintering additives by spark plasma sintering (SPS) at relatively low temperature of 1600°C for 15 min. X-ray diffraction analysis shows that the SPSed sample is pure β-Si 3 N 4 phase without any secondary crystalline phase. The elements Al, Zr, Y and O of the additive can diffuse into Si 3 N 4 lattice forming β-Si 3 N 4based solid solution. The residual additive formed an amorphous phase at the β-Si 3 N 4 grain boundaries. The β-Si 3 N 4 ceramics obtained by SPS using 6.0 wt.% Al 2 O 3 and 6.0 wt.% YSZ as additives shows interlock elongated β-Si 3 N 4 grains of 500 nm in width and 3000 nm in length, high density of 3.29 g/cm 3 , Vickers hardness of 16.15 GPa and high fracture toughness K IC of 6.75 MPa m 1/2 .

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Chemical reactivity of hot-pressed Si3N4–ZrB2 ceramics at 1500–1700 °C

Cited by 28 publications

References 20 publications

Densification and Thermal Stability of Hot‐Pressed Si₃N₄–ZrB₂ Ceramics

Densification and Thermal Stability of Hot‐Pressed Si₃N₄–ZrB₂ Ceramics

Effects of ZrB₂ addition on texture development and properties of porous Si₃N₄-ZrB₂ composites by magnetic field alignment

Improved mechanical properties of dense β-Si3N4 ceramics fabricated by spark plasma sintering with Al2O3-YSZ additives

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Chemical reactivity of hot-pressed Si3N4–ZrB2 ceramics at 1500–1700 °C

Cited by 28 publications

References 20 publications

Densification and Thermal Stability of Hot‐Pressed Si3N4–ZrB2 Ceramics

Densification and Thermal Stability of Hot‐Pressed Si3N4–ZrB2 Ceramics

Effects of ZrB2 addition on texture development and properties of porous Si3N4-ZrB2 composites by magnetic field alignment

Improved mechanical properties of dense β-Si3N4 ceramics fabricated by spark plasma sintering with Al2O3-YSZ additives

Contact Info

Product

Resources

About

Densification and Thermal Stability of Hot‐Pressed Si₃N₄–ZrB₂ Ceramics

Densification and Thermal Stability of Hot‐Pressed Si₃N₄–ZrB₂ Ceramics

Effects of ZrB₂ addition on texture development and properties of porous Si₃N₄-ZrB₂ composites by magnetic field alignment