Oxidation of Boron Nitride Powder in Wet Oxygen.

Oda, Kōhei; Aoki, Kai; Inada, Satoshi; Nagae, Masahiro; Yoshio, Tetsuo

doi:10.2109/jcersj.111.81

Cited by 9 publications

(8 citation statements)

References 6 publications

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“…It was reported that oxidation of BN to B 2 O 3 (l) starts at about 1123 K and B 2 O 3 (l) further reacts with water vapor to form various H x B y O z (g) species . A number of studies have been performed on the oxidation behavior of BN and the oxidation reaction of BN proposed by Oda and Yoshio is generally accepted as following:

BN (s) + \frac{3}{4} O_{2} (g) = \frac{1}{2} B_{2} O_{3} (l) + \frac{1}{2} N_{2} (g)

In view of the recession of BN in water, Coffer and Economy examined a series of BN powder with different interplanar [d (002)] spacings between 0.333 and 0.367 nm in water vapor. The samples with larger interplanar spacings exhibited greater weight loss in a steam of H 2 O/air and H 2 O/N 2 at 973 K. Mass spectrometry indicated that the primary volatile product was HBO 2 with smaller amounts of H 3 BO 3 .…”

Section: Introductionmentioning

confidence: 99%

“…For high‐density CVD BN, the kinetics appeared to follow paralinear behavior. Oda et al . pointed out that the oxidation behavior of α‐BN powder followed paralinear rate law in 8 vol% O 2 –20 vol% H 2 O/balance argon between 1173 and 1373 K. It is important to understand the reaction behavior and the related mechanism of BN recession in water vapor to identify the specific fields and working temperature range of the application.…”

Section: Introductionmentioning

confidence: 99%

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

Hou

Chen

et al. 2013

J. Am. Ceram. Soc.

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The reaction behavior of a-Boron nitride (BN) powder in wet air was investigated at 1273 K using thermogravimetric (TG) analysis, X-ray diffraction (XRD), and mass spectrometry. Scanning electron microscopy and electron probe X-ray microanalysis (EPMA) were used to analyze the morphological and elemental development of the sample. The results show that the reaction process consists of two stages: the oxidation of BN powder to form B 2 O 3 and the further reaction of B 2 O 3 with H 2 O. In the first stage, the oxidation reaction occurs very quickly and can be described by Chou's model. In the second stage, the reaction rate followed the linear rate law.

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BN (s) + \frac{3}{4} O_{2} (g) = \frac{1}{2} B_{2} O_{3} (l) + \frac{1}{2} N_{2} (g)

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Hou

Chen

et al. 2013

J. Am. Ceram. Soc.

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“…In view of the expression of t ¤1 and t ¤2 [Eqs. (10) and (12)], the apparent activation energy ¦E d and ¦E r can be further extracted to be 105.8 and 93.5 kJ/mol.…”

Section: Application Of Rpp Modelmentioning

confidence: 99%

“…2),7)13) Oda et al 10) dealt with the oxidation kinetics of hexagonal BN powder in 8%O 2 20%H 2 O/balance argon at 11731373 K. Paralinear weight change curves were observed. A shrinking sphere model was adopted to treat the reaction of BN with the activation energy of 170 kJ/mol or so, indicating the interface reaction of BN and water vapor was the rate-controlling step.…”

Section: Introductionmentioning

confidence: 99%

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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“…Although it is dicult to directly compare their results and our results, this degradation probably resulted from an increase in aw size by the preferential attack of water or agents in the inter granular phase. 10) …”

Section: Bending Strengthmentioning

confidence: 99%

Corrosion of High Thermal Conductive AlN Ceramics in Aqueous Solutions

Tatami

Lin

Meguro

et al. 2003

J. Ceram. Soc. Japan

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M`±« AlN ·åÛ¿ªµmntH® ½X©êEÑ haEÚ|iEÄ®E¢ LÞ E¬¼Ê×Þ Eª{õOÞ ¡l §åwåw@Â«îñ¤@C2408501 ¡lsÛyJaeíÕä 797Although there is a strong need to understand the chemical corrosion resistance of aluminum nitride (AlN) ceramics for their applications as structural parts in semiconductor processes, there is insucient informa tion on chemical corrosion. We examined two kinds of commercial AlN ceramics with high thermal conduc tivity (170 and 200 W m |1 K |1 ) in both acid and basic aqueous solutions, such as KOH, NaOH, HNO 3 and H 2 SO 4 , using dierent concentrations. Weight changes, phases present, and microstructures on the surfaces before and after testing were evaluated. Basic aqueous solutions corroded AlN ceramics in exactly the same way as acid aqueous solutions. Although secondary phases, such as yttrium aluminate, were mainly dis solved in acid aqueous solutions, AlN itself was corroded in basic aqueous solutions. Furthermore, we ob served that the weight loss of AlN ceramics with higher thermal conductivity exceeded that of lower thermal conductivity. It seems that oxygen dissolved in AlN grain inuences on corrosion of AlN ceramics.

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Oxidation of Boron Nitride Powder in Wet Oxygen.

Abstract: Oxidation kinetics of hexagonal boron nitride powder in 8÷ O 2 20÷ H 2 O/balance argon was investigated at 9001100 C. Paralinear weight change curves were observed. The rate constant of BN oxidation in 8÷ O 2

Cited by 9 publications

References 6 publications

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

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

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

Corrosion of High Thermal Conductive AlN Ceramics in Aqueous Solutions

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