Structure and crystallization of B2O3–Al2O3–SiO2 glasses

Cheng, Yin; Xiao, Huining; Chen, Shuguang; Tang, Bingzhong

doi:10.1016/j.physb.2008.11.198

Cited by 78 publications

(25 citation statements)

References 13 publications

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“…At temperatures between 800 and 1100 8C, Al 4 B 2 O 9 (JCPDS-ICSD, PDF#29-0010) was the only phase, while at 1200 8C Al 18 B 4 O 33 (JCPDS-ICSD, PDF#29-0009) was also present, in accordance with the phase diagram [16] Actually, the Al 18 B 4 O 33 phase is expected to form at $1040 8C from the decomposition of Al 4 B 2 O 9 [15] but the diffraction data clearly showed the presence of Al 4 B 2 O 9 up to 1100 8C (note that, in refs. [8,9], a similar XRD diffraction pattern was attributed to a different phase, Al 20 B 4 O 36 , which however was never found or identified in any other papers dealing with the synthesis and characterization of aluminum borate-based materials (and does not appear in the JCPDS 2008 database). It is likely that the lower temperature phase of aluminum borate is retained to higher temperatures (in the glass ceramic) because of limited mass transport between the glassy phase and the transforming whiskers.…”

Section: Glass-ceramicsmentioning

confidence: 70%

“…The composition of the glass was designed taking into account the results of recent investigations, which indicated that a high B 2 O 3 /SiO 2 ratio favors crystallization, and that BaO and MgO oxides improve the glass formation and influence the morphology of the aluminum borate whiskers [7][8][9]. This glass composition yielded a homogeneous, transparent glass after melting.…”

Section: Glass-ceramicsmentioning

confidence: 99%

“…Unfortunately, the number of oxide systems that can be exploited are limited, as oxide whiskers are usually produced by vapor-solid phase reactions [5,6]. Very recently, the formation and crystallization behavior of glasses in the Al 2 O 3 -B 2 O 3 -SiO 2 system has been investigated, demonstrating that whisker-shaped aluminum borate crystals can be obtained after thermal treatment [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Glass–ceramics and composites containing aluminum borate whiskers

Lee

Zerbetto

Colombo

et al. 2010

Ceramics International

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Section: Glass-ceramicsmentioning

confidence: 70%

Section: Glass-ceramicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Glass–ceramics and composites containing aluminum borate whiskers

Lee

Zerbetto

Colombo

et al. 2010

Ceramics International

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“…The absorption peak shifted to higher wavenumber from 343 (for G1) to 436 (for G2) and 448 (for G3) cm -1 . This suggests that the structure of glass G3 was less rigid [6] and hence would lead to easier nucleation and growth of aluminum borate whiskers. At each heat treatment temperature, all glass compositions crystallized to give the same x-ray diffraction (XRD) peaks therefore only glass G3 data were reported.…”

Section: Resultsmentioning

confidence: 99%

“…Unfortunately, oxide systems that can be exploited are limited. Recently, the formation and crystallization behavior of glasses in the Al 2 O 3 -B 2 O 3 -SiO 2 system has been investigated [6], showing that whisker-shaped aluminum borate crystals can be obtained after thermal treatment.This study investigated a specially formulated glass compositions based on a composition similar to that proposed by Lee et al [7]. In this further compositional modification, both B 2 O 3 and SiO 2 act as glass forming oxides.…”

mentioning

confidence: 99%

Structure and Crystallization of Borate-Based Glasses for Machinable Material Applications

Sooksaen¹

2012

IJAPM

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Abstract-This study investigated bulk crystallization at pre-set temperatures of B 2 O 3 -SiO 2 -Al 2 O 3 -BaO-MgO glass system. Heat treatment at pre-set temperature was carried out between 900 and 1200°C on clear glasses to form non-transparent glass-ceramics. Structure of glasses were studied by Fourier transform infrared spectroscopy, phase evolution in the bulk crystallized samples was studied by x-ray diffraction, microstructures were observed by scanning electron microscope and micro-hardness was measured by Vickers method. Aluminum borate whiskers/rods were in the nano to micro sized regime and dispersed randomly within the remaining glass matrix. Whiskers had different sizes and morphologies depending on the heat treatment temperature. Increasing heat treatment temperature led to an increase in crystal size, length and the formation of hollow tubes. The surface hardness decreased when the morphology changed from fine rods into hollow tubes. The synthesized glass-ceramics in this study can be applied as machinable materials in various applications because their microstructures can resist microcracking.Index Terms-Glass, crystallization, microstructure, whiskers, hardness. I. INTRODUCTIONFibers and whiskers reinforced glasses and ceramics can lead to significant improvements in mechanical properties, such as increased fracture toughness, bending strength, hardness and thermal shock resistance [1]. The possibility of using whiskers is limited due to the health hazard posed by loose particles with a high aspect ratio shape [2]. Aluminum borate whisker (9Al 2 O 3 ⋅2B 2 O 3 ) is a refractory compound (melting point 1440°C) possessing excellent physical properties, such as low density (2.94 g/cm 3 ), high hardness, high Young's modulus (400 GPa), high electrical resistivity and low coefficient of thermal expansion [3]. Such characteristics suggest that aluminum borate whisker could be used to reinforce ceramics to give ceramic-ceramic composites with increased fracture toughness and also reinforce light metals such as aluminum alloys. The metal matrix composites (MMCs) can be useful for the automobile and aerospace industries. Manuscript received February 12, 2012; revised March 24, 2012 Aluminum borate whiskers have been synthesized by various methods such as vapor phase method, solid-state reactive firing and flux method using borates [4][5]. However, the product yields were found to be very low, 10% or less. The in-situ direct growth of whiskers in a glass to form glass-ceramic is an attractive alternative method. This is analogous to the creation of fluorcansite platelets in toughened glass-ceramics. Unfortunately, oxide systems that can be exploited are limited. Recently, the formation and crystallization behavior of glasses in the Al 2 O 3 -B 2 O 3 -SiO 2 system has been investigated [6], showing that whisker-shaped aluminum borate crystals can be obtained after thermal treatment.This study investigated a specially formulated glass compositions based on a composition similar to that proposed by Lee et al...

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The Surface Cracking Resistance of Al₂O₃‐Modified SiC_f/SiC‐B₄C Composites after Cyclic Oxidation in Wet Environment

Shan

Wang²,

Xue

et al. 2019

Adv Eng Mater

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Aluminum oxide is introduced into SiCf/(SiC + B4C) composites to improve the surface cracking resistance after oxidizing at 1100 °C in O2/H2O (40/60) atmosphere. Research on morphology observation of oxidized composites reveals that Al2O3 can lead to the formation of a dense and smooth oxidation layer, resulting in a relatively shallow oxygen penetration depth. In‐depth studies on acoustic emission reveal that composites with Al2O3 can improve the surface cracking resistance after oxidizing at 1100 °C in O2/H2O (40/60) atmosphere since the retention rates of σmin (first acoustic emission [AE] stress) and σonset (AE onset stress) are significantly increased compared with virgin composites. Moreover, a small number of cumulative events and steep slope of strength–time curves at the initial stage further confirm the improvement of surface cracking resistance after oxidation.

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Structure and crystallization of B2O3–Al2O3–SiO2 glasses

Cited by 78 publications

References 13 publications

Glass–ceramics and composites containing aluminum borate whiskers

Glass–ceramics and composites containing aluminum borate whiskers

Structure and Crystallization of Borate-Based Glasses for Machinable Material Applications

The Surface Cracking Resistance of Al₂O₃‐Modified SiC_f/SiC‐B₄C Composites after Cyclic Oxidation in Wet Environment

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Structure and crystallization of B2O3–Al2O3–SiO2 glasses

Cited by 78 publications

References 13 publications

Glass–ceramics and composites containing aluminum borate whiskers

Glass–ceramics and composites containing aluminum borate whiskers

Structure and Crystallization of Borate-Based Glasses for Machinable Material Applications

The Surface Cracking Resistance of Al2O3‐Modified SiCf/SiC‐B4C Composites after Cyclic Oxidation in Wet Environment

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The Surface Cracking Resistance of Al₂O₃‐Modified SiC_f/SiC‐B₄C Composites after Cyclic Oxidation in Wet Environment