High α-β phase transition and properties of YbF3-added porous Si3N4 ceramics obtained by low temperature pressureless sintering

Ding, Honghui; Zhao, Zhihao; Qi, Te; Li, Xiaolei; Ji, Huiming

doi:10.1016/j.ijrmhm.2018.09.004

Cited by 9 publications

(3 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Most of the Al and AlN will be converted to α‐Al 2 O 3 , and the rest will be solid‐dissolved in the lattice of other Al‐containing substances under high‐temperature sintering. The oxides in the SAD, such as Fe 2 O 3 , SiO 2 , CaO, can be solid‐dissolved in the crystal lattice, which is inadequate to be detected by XRD, while the salts in SAD can also act as flux during sintering 38 . Table 1 illustrates that with the increase of ball‐milling time, the sintering linear shrinkage changed from 1.38% to 3.60%, and the bulk density of porous ceramics gradually increased from 1.65 to 1.85 g/cm 3 .…”

Section: Resultsmentioning

confidence: 99%

“…The oxides in the SAD, such as Fe 2 O 3 , SiO 2 , CaO, can be solid-dissolved in the crystal lattice, which is inadequate to be detected by XRD, while the salts in SAD can also act as flux during sintering. 38 Table 1 illustrates that with the increase of ball-milling time, the sintering linear shrinkage changed from 1.38% to 3.60%, and the bulk density of porous ceramics gradually increased from 1.65 to 1.85 g/cm 3 . Correspondingly, the open porosity decreased from 43.49% to 36.34%, and thermal conductivity ranged from 0.65 to 1.67 W/(m⋅K).…”

Section: Properties Of Green Bodies and Porous Ceramicsmentioning

confidence: 99%

See 1 more Smart Citation

Hydrolysis‐induced simultaneous foaming and coagulation casting of secondary aluminum dross aqueous suspension

Zhang

Shen

et al. 2023

J Am Ceram Soc.

View full text Add to dashboard Cite

The reactive AlN, heavy metal ions, and salts in secondary aluminum dross make them harmful to the environment and difficult to handle, and therefore categorized as hazardous solid waste. A novel, simple, and versatile technique has been proposed here to prepare hierarchically porous ceramics using secondary aluminum dross as the sole raw material, namely, the hydrolysis-induced simultaneous foaming and coagulation casting method. As the main component, Al and AlN could be hydrolyzed to generate aluminum hydroxide sol, which can form three-dimensional network and lead to the outstanding compressive strength of green body (7.03 MPa). Gas release during hydrolysis, high-temperature oxidation of AlN, and metallic Al based on Kirkendall effect could account for the final multilevel pores. The utilization of harmful components in secondary aluminum dross, supplys an alternative colloidal forming way for porous green body with complex shape when combined with other ceramic powders or inorganic solid waste. Low sintering shrinkage of 1.38%-3.60% for hierarchically porous ceramics offers this highly effective and low-cost method to be easily promoted for industrial production.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Properties Of Green Bodies and Porous Ceramicsmentioning

confidence: 99%

Hydrolysis‐induced simultaneous foaming and coagulation casting of secondary aluminum dross aqueous suspension

Zhang

Shen

et al. 2023

J Am Ceram Soc.

View full text Add to dashboard Cite

show abstract

“…The resulting material has a porosity of 33.49%, a dielectric constant of 5.82, and a dielectric loss tangent of 6.0 × 10 −3 . Ding et al 11 . produced porous silicon nitride ceramics, with a dielectric constant of 5.2 and a dielectric loss of 2.0 × 10 −3 by sintering at 1550°C in a nitrogen atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Dielectric and mechanical properties of porous Si₃N₄–Kovar composites prepared by low‐temperature oxidation sintering

Lin,

Xia,

Cao

et al. 2024

J Am Ceram Soc.

View full text Add to dashboard Cite

The aim of this study is to investigate the impact of the Kovar glass content on the mechanical and electrical properties of Si3N4–Kovar composites sintering at air atmosphere. To achieve this, Si3N4–Kovar composites were prepared using molding technology with the Kovar glass powder ranging from 20 to 70 wt%. The phase composition, morphology, bulk density, apparent porosity, flexural strength at room temperature, dielectric constant, and dielectric loss of the composites were all examined in relation to changing the Kovar glass content. During the sintering process, the α‐quartz on the surface of Si3N4 particles acted as the crystal nucleus, inducing the crystallization of the glass at the wetting position that the Kovar glass and the surface of the Si3N4 particles. A small amount of the β‐quartz phase was crystallized at 750–850°C, followed by a large amount of the β‐quartz phase crystallizing above 900°C. Additionally, some β‐quartz phase transformed into the metastable β‐cristobalite phase that could exist below 1470°C. During the cooling process, the β‐cristobalite phase transformed into a low‐temperature α‐cristobalite phase, while the β‐quartz phase transformed into a low‐temperature α‐quartz phase. The results indicate that the Si3N4–Kovar glass composite with 60 wt% the Kovar glass content sintered at 900°C exhibits higher density (1.88 g/cm3), lower porosity (25.4%), higher flexural strength (55.34 MPa), lower dielectric constant (3.46), and lower dielectric loss (4.26 × 10−3).

show abstract

Fabrication and flexural strength of porous Si3N4 ceramics with Li2CO3 and Y2O3 as sintering additives

Luo

2020

J. Cent. South Univ.

View full text Add to dashboard Cite

High α-β phase transition and properties of YbF3-added porous Si3N4 ceramics obtained by low temperature pressureless sintering

Cited by 9 publications

References 30 publications

Hydrolysis‐induced simultaneous foaming and coagulation casting of secondary aluminum dross aqueous suspension

Hydrolysis‐induced simultaneous foaming and coagulation casting of secondary aluminum dross aqueous suspension

Dielectric and mechanical properties of porous Si₃N₄–Kovar composites prepared by low‐temperature oxidation sintering

Fabrication and flexural strength of porous Si3N4 ceramics with Li2CO3 and Y2O3 as sintering additives

Contact Info

Product

Resources

About

High α-β phase transition and properties of YbF3-added porous Si3N4 ceramics obtained by low temperature pressureless sintering

Cited by 9 publications

References 30 publications

Hydrolysis‐induced simultaneous foaming and coagulation casting of secondary aluminum dross aqueous suspension

Hydrolysis‐induced simultaneous foaming and coagulation casting of secondary aluminum dross aqueous suspension

Dielectric and mechanical properties of porous Si3N4–Kovar composites prepared by low‐temperature oxidation sintering

Fabrication and flexural strength of porous Si3N4 ceramics with Li2CO3 and Y2O3 as sintering additives

Contact Info

Product

Resources

About

Dielectric and mechanical properties of porous Si₃N₄–Kovar composites prepared by low‐temperature oxidation sintering