Thermodynamic measurement of (Al2O3+B2O3) system by double Knudsen cell mass spectrometry

Nagai, Takashi; Ogasawara, Yasushi; Maeda, Masafumi

doi:10.1016/j.jct.2009.06.002

Cited by 19 publications

(6 citation statements)

References 16 publications

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“…Furthermore, chemical element analysis indicates that B is found in the oxide layer with Al 2 O 3 but is not found in the oxide layer without Al 2 O 3 , which may be attributed to that Al 2 O 3 and B 2 O 3 can form more stable compounds (shown in Figure B, eg, Al 4 B 2 O 9 , Al 5 BO 9 ) to limit the volatilization of B 2 O 3. However, when the oxidization temperature is 1300°C, a bubbling phenomenon on the oxidation layer is observed (Figure H,I). It may be attributed to that higher viscosity of the oxidation phase.…”

Section: Resultsmentioning

confidence: 99%

The effect of Al₂O₃ on the high‐temperature oxidation resistance of Si‐B‐C ceramic under air atmosphere

Shan

Kan

et al. 2018

Int J Applied Ceramic Tech

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Si‐B‐C ceramics were prepared through reaction sintering, and the influence of Al2O3 addition on the high‐temperature (1100‐1300°C) oxidation behavior of the material under air atmosphere was studied. The erosion behavior and mechanism are determined from the measurement of weigh changes, microstructure observations, and characterization of the generated oxides on postexposure specimens. Results show that Al2O3 is enriched in the oxidized layer, inhibiting the volatilization of B2O3 and impeding the crystallization ability of oxide (cristobalite). Narrower erosion layer and less weigh change are observed with Al2O3. Low‐frequency Raman results reveals that with the increase in Al2O3, the bending vibrations of the BO4 units and B‐O‐B stretching of the metaborate ring relative intensity are enhanced. Furthermore, high‐frequency Raman results shows that the relative proportion of high‐dimensional vibration modes Q3 and Q4 which result in a higher viscosity of melt and a greater resistance of oxygen diffusion are positively correlated with Al2O3.

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Section: Resultsmentioning

confidence: 99%

The effect of Al₂O₃ on the high‐temperature oxidation resistance of Si‐B‐C ceramic under air atmosphere

Shan

Kan

et al. 2018

Int J Applied Ceramic Tech

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“…which if it reaches a temperature of 1035 °C and higher, turns into Al 18 B 4 O 33 oxide [21,22]. Since boron oxide melts at 450 °C, the oxides of aluminum and boron contact and therefore react to form borates, which in turn remove liquid B 2 O 3 from the surface of the particles.…”

Section: Resultsmentioning

confidence: 99%

Powders of metal borides obtained by the SHS method and low-temperature plasma

et al. 2018

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This paper introduces principle possibility of producing aluminum and titanium boride predetermined morphology using the SHS method and plasma processing. Thermal analysis data for synthesized boride powders in comparison with boron powder and nano-sized aluminum are presented It was found that the synthesized metal borides, according to the thermal analysis data, are promising as a fuel in high-energy materials: the oxidation state of AlB2 is ~ 80%, at a degree of boron oxidation ~ 20%, aluminum ~ 67%.

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“…There are two possible reasons for the inhibition of B 2 O 3 volatilization. One is the formation of stable compound Al 4 B 2 O 9 39 . The other is that the stable aluminosilicate glass has a protective effect on B 2 O 3 .…”

Section: Discussionmentioning

confidence: 99%

“…One is the formation of stable compound Al 4 B 2 O 9 . 39 The other is that the stable aluminosilicate glass has a protective effect on B 2 O 3 . Figure 10 shows a schematic diagram of cracks self-healing mechanism for SiC f /SiC-B 4 C composites.…”

Section: Discussionmentioning

confidence: 99%

More effective crack self‐healing capability of SiC_f/SiC‐B₄C with Al₂O₃ modified under wet environment

Shan

Xue

et al. 2020

J Am Ceram Soc

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Aluminum oxide has been introduced into SiC f /(SiC + B 4 C) composites to improve the crack self-healing property in O 2 /H 2 O atmosphere. The observation of the surface and interior morphologies of the oxidized composites reveal that Al 2 O 3 can lead to rapid self-healing of cracks, which will effectively block the oxidation of interior interphase and fiber. Further investigation reveals that Al 2 O 3 plays an important role in impeding the crystallization of SiO 2 and limiting the volatilization of B 2 O 3. It is beneficial to form self-healing fluid glass phase and improve glass phase stability. Under these circumstances, the pre-crack can be healed more effectively, which is advantageous for composites to remain high strength retention rate.

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Thermodynamic measurement of (Al2O3+B2O3) system by double Knudsen cell mass spectrometry

Cited by 19 publications

References 16 publications

The effect of Al₂O₃ on the high‐temperature oxidation resistance of Si‐B‐C ceramic under air atmosphere

The effect of Al₂O₃ on the high‐temperature oxidation resistance of Si‐B‐C ceramic under air atmosphere

Powders of metal borides obtained by the SHS method and low-temperature plasma

More effective crack self‐healing capability of SiC_f/SiC‐B₄C with Al₂O₃ modified under wet environment

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Thermodynamic measurement of (Al2O3+B2O3) system by double Knudsen cell mass spectrometry

Cited by 19 publications

References 16 publications

The effect of Al2O3 on the high‐temperature oxidation resistance of Si‐B‐C ceramic under air atmosphere

The effect of Al2O3 on the high‐temperature oxidation resistance of Si‐B‐C ceramic under air atmosphere

Powders of metal borides obtained by the SHS method and low-temperature plasma

More effective crack self‐healing capability of SiCf/SiC‐B4C with Al2O3 modified under wet environment

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Product

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The effect of Al₂O₃ on the high‐temperature oxidation resistance of Si‐B‐C ceramic under air atmosphere

The effect of Al₂O₃ on the high‐temperature oxidation resistance of Si‐B‐C ceramic under air atmosphere

More effective crack self‐healing capability of SiC_f/SiC‐B₄C with Al₂O₃ modified under wet environment