Kinetics and mechanism of thermal oxidation of sialon ceramic powders

MacKenzie, Kenneth J.D.; Sheppard, C.M.; Barris, G.C.; Mills, Andrew; Shimada, Shiro; Kiyono, Hajime

doi:10.1016/s0040-6031(98)00333-5

Cited by 31 publications

(35 citation statements)

References 15 publications

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“…In this work, the value of ΔE for the oxidation of β-SiAlON synthesized from coal gangue with ferric oxide is 184.5 kJ/mol, which is similar to that (175.7 kJ/mol) synthesized from bauxite [18]. While the value is lower than the result (250 kJ/mol) obtained by MacKenzie et al [13]. This is probably because the impurities existing in raw materials lower the value of the activation energy required.…”

Section: Oxidation Kineticssupporting

confidence: 71%

“…This is in accordance with the previous results in Refs. [7][8][9][10][11][12][13][14][15][16][17][18].…”

Section: Oxidation Kineticsmentioning

confidence: 99%

“…Several articles have reported the oxidation behavior of SiAlON materials in powder form and bulk ceramic [7][8][9][10][11][12][13]. However, the works are far from enough, especially on the aspect of the oxidation of SiAlON synthesized from natural aluminosilicate minerals.…”

Section: Introductionmentioning

confidence: 99%

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Thermal oxidation of SiAlON powders synthesized from coal gangue

Hou

Yue

Zhang

et al. 2011

Int J Miner Metall Mater

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The oxidation behavior of different SiAlON phases (β-SiAlON, X-phase SiAlON and 12H powders) synthesized from coal gangue in air atmosphere was investigated using isothermal thermogravimetry (TG) and field-emission scanning electron microscopy (FE-SEM). The effect of ferric oxide impurities in coal gangue was studied. The results show that ferric oxide contributes to the growth of SiAlON crystalline during the synthesis process. In the oxidation experiment, the existence of ferric oxide decreases the oxidation resistance of SiAlON. The reason is that the impurity causes the formation of a liquid phase at a higher temperature. At 1423-1623 K, the oxidation of SiAlON powders is diffusion controlled and it can be described by Chou's model. A fair agreement is found between theoretical calculations and the experimental data.

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Section: Oxidation Kineticssupporting

confidence: 71%

“…This is in accordance with the previous results in Refs. [7][8][9][10][11][12][13][14][15][16][17][18].…”

Section: Oxidation Kineticsmentioning

confidence: 99%

See 1 more Smart Citation

Thermal oxidation of SiAlON powders synthesized from coal gangue

Hou

Yue

Zhang

et al. 2011

Int J Miner Metall Mater

View full text Add to dashboard Cite

show abstract

“…13 MacKenzie et al extended the powder oxidation study to O -SiAlON and X-phase SiAlON, which was synthesized by the silicothermal method. 14 15 ; therefore the parabolic rate law was too simple to describe the intrinsical oxidation mechanism and could not reach a consistent agreement. Even though most oxidation processes have been interpreted with the parabolic rate law, there have been reported for ␤-SiAlON ceramics with the z value of 1, 2.5 and 3.8, which deviated from the parabolic rate law at temperatures above 1300 • C. 5 The kinetics was interpreted with the modified rate law:…”

Section: Introductionmentioning

confidence: 98%

“…Most researchers studied the oxidation kinetics of SiAlON materials using this formula. 13,14 The oxidation kinetics of ␤-SiAlON (z = 2.45) powder prepared by carbothermal synthesis was studied by isothermal thermogravimetry at 1100-1300 • C and was found that it followed satisfactorily a parabolic rate law with an activation enthalpy of 161 kJ/mol. It was suggested that the rate was controlled by the permeation of oxygen through the product layer developing on the grains.…”

Section: Introductionmentioning

confidence: 99%