Effect of impurities of Fe2O3 and TiO2 in bauxite on oxidation kinetics of β-SiAlON powders

Tian, Xuekun; Su, Kai; Ouyang, Deze; Jin, Gao; Jia, Quanli; Liu, Xinhong

doi:10.1016/j.corsci.2022.110374

Cited by 13 publications

(7 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Materials 2023, 16, x FOR PEER REVIEW 5 of 13 SiO2(s) further reacted with MgO to form Mg2SiO4 via Equation ( 4) [18]. Similar to the sialon phase [26], it was believed that MgO, Al2O3, SiO2, C, and N2 were formed with the oxidation of Mg-sialon (Equations ( 5) and ( 6)). After that, the Al2O3 would further react with MgO to form MgAl2O4 (Equation ( 7)) [7].…”

Section: Resultsmentioning

confidence: 99%

“…Mg-sialon(s) + O2(g) → MgO(s) + Al2O3(s) + SiO2(s) + N2(g) (5) Mg-sialon(s) + CO(g) → MgO(s) + Al2O3(s) + SiO2(s) + N2(g)+ C(s) (6) MgO(s) + Al2O3(s) = MgAl2O4(s), (7) The ΔrG θ for Equations ( 5) and ( 6) could not be calculated due to a lack of thermodynamic data from the Mg-sialon phase (Mg3.29Si1.89Al2.82O4.41N4.59), and this reaction was given based on the relevant references and the present experimental results [26]. Meanwhile, the thermodynamic calculations for Equations ( 4) and ( 7) are shown in Figure 4.…”

Section: Resultsmentioning

confidence: 99%

“…Meanwhile, the thermodynamic calculations for Equations ( 4) and ( 7) are shown in Figure 4. The ∆ r G θ for Equations ( 5) and (6) could not be calculated due to a lack of thermodynamic data from the Mg-sialon phase (Mg 3.29 Si 1.89 Al 2.82 O 4.41 N 4.59 ), and this reaction was given based on the relevant references and the present experimental results [26]. Meanwhile, the thermodynamic calculations for Equations ( 4) and ( 7) are shown in Figure 4.…”

Section: Resultsmentioning

confidence: 99%

“…Sialon belongs to the solid solutions of Al and O atoms in the crystal lattice of Si 3 N 4 [20,21], and it has gained much attention due to its high flexural strength (350~1100 MPa) [22], low thermal expansion (3.7~4.5 × 10 −6 / • C) [23], and excellent resistance to oxidation and corrosion [24][25][26]. Two types of polymorphs of Sialon, αand β-phases, were widely researched.…”

Section: Introductionmentioning

confidence: 99%

“…Two types of polymorphs of Sialon, αand β-phases, were widely researched. In comparison, α-Sialon has higher hardness and better thermal shock resistance than β-Sialon, and its crystal has large interstices, which could accommodate some metal cations [25,26]. Previous research has shown that the physical and chemical properties of the material are regulated due to the point defects and lattice distortion caused by ion substitution [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Effect of In Situ Mg-Sialon on the Oxidation Behavior of Low-Carbon MgO-C Refractories

Dong

Xing

et al. 2023

Materials

View full text Add to dashboard Cite

The in situ Mg-sialon in low-carbon MgO-C refractories was studied with respect to its oxidation behavior and mechanism at 1500 °C. The results indicated that the oxidation index and rate constant of low-carbon MgO-C refractories with Mg-sialon were 26.2% and 0.51 × 10−3 cm2/min at 1500 °C for 2 h, respectively. The formation of a dense MgO-Mg2SiO4-MgAl2O4 protective layer contributed to considerable oxidation resistance, and the generation of this thicker layer was due to the combined volume effect of Mg2SiO4 and MgAl2O4. The reduced porosity and more complex pore structure were also found in the refractories with Mg-sialon. Therefore, further oxidation was restricted as the oxygen diffusion path was effectively blocked. This work proves the potential application of Mg-sialon in improving the oxidation resistance of low-carbon MgO-C refractories.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of In Situ Mg-Sialon on the Oxidation Behavior of Low-Carbon MgO-C Refractories

Dong

Xing

et al. 2023

Materials

View full text Add to dashboard Cite

show abstract

Oxidation Behavior of Spent NdFeB Magnet Under Selective Oxidation Conditions

Seo,

Park,

et al. 2023

High Temperature Corrosion of mater.

View full text Add to dashboard Cite

Oxidation behavior of the spent NdFeB magnet was investigated when exposed to the selective oxidation conditions to achieve effective separation of Nd element by forming an oxide form from metallic Fe one. XRD results con rmed that the selective oxidation heat treatment successfully leaded to the formation of Nd 2 O 3 and α-Fe phases, which was ascribed to the dissociation of the Nd 2 Fe 14 B phase as a consequence of only Nd's oxidation. The oxidation of the Nd element kept proceeding with time and temperature of the heat treatment, requiring 60 min when heat treated at 950 °C for the 100% oxidation degree based on the weight gain calculation. From the SEM analysis, it can be inferred that the oxygen diffusion for the oxidation mainly occurred through grain boundary at the initial stage and then, α-Fe lattice diffusion for inside grains. TEM analysis con rmed that the Nd 2 O 3 formed at the early oxidation had hcp structure and only coarsening with oxidation, maintaining its structure. As the no oxidation of the Fe element did not induced diffusion barriers such as the outmost Fe 2 O 3 layer and Fe 2 O 3 matrix, facile oxygen diffusion through the grain boundary and α-Fe lattice was possible, leading to the activation energy for oxygen diffusion as low as 28 kJ/mol. The speci c oxidation condition maintained the good microstructure for oxygen diffusion, α-Fe matrix containing submicron Nd 2 O 3 particles, which made it possible that the good diffusion paths such as grain boundary and α-Fe lattice kept working during the oxidation.

show abstract

Structure-property relationship and emerging applications of nano- and micro-sized fillers reinforced sialon composites: a review

Ogunbiyi,

Jamiru,

Adekoya

et al. 2024

J Aust Ceram Soc

View full text Add to dashboard Cite

Oxonitridoaluminosilicates (SiAlON) are renowned in advanced ceramics for their exceptional properties: high temperature stability, excellent oxidation resistance, and good wear resistance. Incorporating micro- and nano-sized fillers into SiAlON matrices enhances their properties, yielding SiAlON composite materials with superior mechanical, tribological, and thermal characteristics. This review examines fabrication techniques for producing SiAlON micro/nanocomposites and the structure-property relationships governing their performance across different phase compositions (β, α, X, and O-phases). A comprehensive literature review scrutinized fabrication techniques and structure-property relationships from various databases and scholarly articles. Although SiAlON composites with micro/nano inclusions hold promise across applications, understanding their fabrication processes, structure-property relationships, and potential applications in different fields is crucial. The review highlights diverse fabrication techniques for SiAlON micro/nanocomposites and provides insights into their structure-property relationships. Additionally, emerging applications in structural domains, cutting tools, coatings, corrosion protection, solar cells, LEDs, biomedical realms, and filtration membranes are discussed. This review is a valuable resource for researchers and engineers interested in designing SiAlON products tailored for sophisticated applications. It emphasizes understanding fabrication processes and structure-property relationships to unlock SiAlON-based materials' full potential across industries.

show abstract

Effect of impurities of Fe2O3 and TiO2 in bauxite on oxidation kinetics of β-SiAlON powders

Cited by 13 publications

References 25 publications

Effect of In Situ Mg-Sialon on the Oxidation Behavior of Low-Carbon MgO-C Refractories

Effect of In Situ Mg-Sialon on the Oxidation Behavior of Low-Carbon MgO-C Refractories

Oxidation Behavior of Spent NdFeB Magnet Under Selective Oxidation Conditions

Structure-property relationship and emerging applications of nano- and micro-sized fillers reinforced sialon composites: a review

Contact Info

Product

Resources

About