The Reaction Mechanism and Kinetics of α‐<scp>BN</scp> Powder in Wet Air at 1273 K

Hou, Xinmei; Yu, Ziyou; Chen, Zhi Yuan; Chou, Kuo‐Chih; Zhao, Baojun

doi:10.1111/jace.12276

Cited by 32 publications

(58 citation statements)

References 20 publications

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“…Xi) Carbon dioxide diffuses to the bulk gas phase. Generally, the chemical reaction at the reacted interface or gas diffusion in the product layer is the controlling step, 31,32) and this mainly depends on the substance, reaction, reaction temperature, particle size and even gas concentration. Taking particle size as an example, the particle size can influence the reduction mechanism.…”

Section: Reduction Mechanism Of Metal Oxides By Comentioning

confidence: 99%

A Model for the Reduction of Metal Oxides by Carbon Monoxide

Dang

Chou

2018

ISIJ International

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The reduction of metal oxides by carbon monoxide is a very significant reaction in metallurgical and chemical industries. In current study, a kinetic model describing the reduction reaction of metal oxides by CO has been developed. The model is in the analytic function of parameters such as temperature, radius of the particle, CO content, density of metal oxides and time, which is, therefore, convenient for usage and theoretical analysis. The developed model can be applied to describe the reduction kinetics of metal oxides under both isothermal and non-isothermal conditions. Particularly, it can be used to describe the kinetics of both single reduction reaction (single reaction interface) and dual reduction reactions (double reaction interfaces, such as, the reduction of Fe 2 O 3 to FeO with Fe 3 O 4 being the intermediate product) as well. Application of the developed model to practical systems validated that its predicted values agreed very well with the experimental data in literatures.

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Section: Reduction Mechanism Of Metal Oxides By Comentioning

confidence: 99%

A Model for the Reduction of Metal Oxides by Carbon Monoxide

Dang

Chou

2018

ISIJ International

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“…in them that it cannot offer an explicit expression. Because of the above reasons, the curves obtained from the above equation are very sensitive to the variation of k p and k l as pointed out by Jacobson et al (2) RPP model Chou et al 15) has proposed a real physical picture (RPP) model to deal with the gas-solid reaction under the condition where all kinds of possible controlling steps exist based on the physical principles and mathematical calculation. Compared with the paralinear kinetic model, the biggest character of the RPP model is that it gives an explicit expression of the reacted fraction as a function of time, temperature, gas partial pressure and sample shape etc.…”

Section: Reaction Kinetics 321 Kinetic Modelsmentioning

confidence: 99%

“…This advantage has been proved in our recent work in dealing with the oxidation reaction of nonoxide materials. 17) It is well known that the activation energy, ¦E, is a very useful parameter to evaluate the stability of material. It can be obtained from both the two models.…”

Section: Jcs-japanmentioning

confidence: 99%

“…Therefore, it is meaningful to get an explicit model in which the reacted fraction can be expressed as a function of temperature, water content and other factors. Recently Chou et al 15) has developed a new model based on gas-solid reaction, i.e. RPP model (real physical picture), in which it can explicitly express the reacted fraction as a function of time, temperature, sample size as well as many other related physical properties.…”

Section: Introductionmentioning

confidence: 99%

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Reaction of CVD BN ceramics in water vapor at 1023–1173 K using different kinetic model

Wang

Liu

Zhang

et al. 2014

J. Ceram. Soc. Japan

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The reaction behavior of chemically vapor-deposited BN ceramics in wet air was investigated. The results showed that the oxidation reaction occurred simultaneously with the volatile reaction. The long-term degradation rate of BN was determined by the volatilization reaction of B 2 O 3 with H 2 O. The reaction kinetics was discussed using different kinetic models, i.e. the paralinear kinetic model and RPP model. Although both models could be adopted to fit the experimental data, RPP model was preferred because the model not only gave an explicit expression of the reaction fraction as the function of all parameters that would be convenient for theoretical discussion, but also it would perform a simple calculation.

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“…Furthermore, a series of oxidation kinetic models were proposed during past decades. 14)19) These models were based on gas-solid reactions and have been successfully applied to treat the oxidation behaviour of nitrides or oxynitride. However, no oxidation kinetic models have been proposed to investigate the oxidation involved with the evaporation of oxidation products.…”

Section: Introductionmentioning

confidence: 99%

Oxidation kinetics of magnesium aluminum oxynitride–boron nitride (MgAlON–BN) composites

Sun

Seetharaman

et al. 2014

J. Ceram. Soc. Japan

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The oxidation behaviour of MgAlONBN composite was investigated under the air atmosphere using thermogravimetry (TG), scanning electron microscopy (SEM) and X-ray diffraction (XRD) techniques in the present articles. Non-isothermal experimental results indicated that the rate of oxidation can be neglected at low temperature and, with further increasing temperatures, an increase of the oxidation was observed. While BN addition promoted the oxidation above 1100 K, and the weight gain was observed to decrease due to the fast evaporation of boron oxide as the temperature was beyond 1580 K. Isothermal studies also clearly indicated the decrease of weight gain due to evaporation after a certain oxidation time. The oxidation mechanism was investigated, and the results showed the oxidation products were £-Al 2 O 3 at low temperature and transformed to ¡-Al 2 O 3 as the temperature was above 1100°C. BN addition promoted the transformation from £-Al 2 O 3 to ¡-Al 2 O 3 . From the isothermal oxidations, the kinetics of oxidation and evaporation were evaluated, and the overall kinetics of oxidation and evaporation were studied, and the activation energy for evaporation of B 2 O 3 and for the oxidation of MgAlON15 vol %BN at the later stage are 115.4 and 196.1 kJ/mol, respectively. The present paper provides a way to deal with oxidation of composites containing evaporating component.

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The Reaction Mechanism and Kinetics of α‐BN Powder in Wet Air at 1273 K

Cited by 32 publications

References 20 publications

A Model for the Reduction of Metal Oxides by Carbon Monoxide

A Model for the Reduction of Metal Oxides by Carbon Monoxide

Reaction of CVD BN ceramics in water vapor at 1023–1173 K using different kinetic model

Oxidation kinetics of magnesium aluminum oxynitride–boron nitride (MgAlON–BN) composites

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