Expansion characteristics of some Li2OBaOAl2O3SiO2 glasses and glass-ceramics

Khater, G.A.; Idris, M. H.

doi:10.1016/j.ceramint.2005.06.007

Cited by 7 publications

(3 citation statements)

References 4 publications

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“…Because of their low softening temperature, high chemical durability and low dielectric constant [3], BBSA glass-ceramics have been extensively studied. Most researches of BBSA glass-ceramics focused on the effect of some oxides (MgO, Li 2 O or B 2 O 3 ) on the sintering behavior and crystallization [4][5][6][7][8]. However, the influence of sintering temperature on the properties of BBSA system has not been reported.…”

Section: Introductionmentioning

confidence: 97%

Effect of sintering temperatures on properties of BaO–B2O3–SiO2–Al2O3 glass/silica composites for CBGA package

Long

Duan

2015

J Mater Sci: Mater Electron

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BaO-B 2 O 3 -SiO 2 -Al 2 O 3 (BBSA) glass/silica composites synthesized by solid-state reaction method were developed for CBGA packages, and the effects of sintering temperature (900-950°C) on the phase transformation, microstructure, thermal, mechanical and electrical properties were investigated. XRD results show that the major phases quartz and cristobalite, and the minor phase BaSi 2 O 5 are detected in BBSA composites. Furthermore, it was found that the quartz phase transforms to cristobalite phase at 930-940°C. The formation of cristobalite phase with higher coefficient of thermal expansion (CTE) led to the increase of CTE value of BBSA composites. However, excessive cristobalite phase content would degrade the mechanical properties and the linearity of thermal expansion of the ceramics. BBSA composites sintered at 920°C exhibited excellent properties: low dielectric constant and loss (e r = 6.2, tand = 10 -4 at 1 MHz), high bending strength (179 MPa), high CTE (12.19 ppm/°C) as well as superior linearity of the thermal expansion.

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Section: Introductionmentioning

confidence: 97%

Effect of sintering temperatures on properties of BaO–B2O3–SiO2–Al2O3 glass/silica composites for CBGA package

Long

Duan

2015

J Mater Sci: Mater Electron

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“…BaO has been regarded as an effective addition to glass-ceramics systems, which can significantly change the refractoriness and thermal expansion coefficient via influencing the kind and character of the crystalline phases present [26,27]. Thus, BaO can provide the possibility to enhance the wet property of the bond-diamond abrasive, as well as the performance.…”

Section: Introductionmentioning

confidence: 99%

Exploring the Influences of BaO Amount on the Wettability and Mechanical Behavior of Vitrified Bond Diamond Composites

Guo,

Kuang,

Liu

et al. 2024

Materials

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In recent years, the vitrified bond diamond grinding wheel has been applied widely in automotive, aerospace and machine tools of manufacturing industries. However, the main problems of low intensity and poor wettability between the vitrified bond and diamond abrasive limit its further application. In this study, BaO was added into the basic SiO2–B2O3–Al2O3–R2O vitrified bond system, and the impact of BaO on the wettability, thermal and mechanical behavior of vitrified bond and vitrified bond diamond composites was systematically discussed, respectively. The test indicated that when the vitrified bond containing BaO of 6 wt.% was sintered with diamond abrasive at 750 °C, a continuous barium feldspar phase transition layer between diamond abrasive and the bond was generated, which ameliorated the wet property of the bond–diamond abrasive. The contact angle varied from 59° on the blank sample to 35°, and the expansion coefficient changed from 6.24 × 10−6/K to 5.30 × 10−6/K. The Rockwell hardness and flexural strength of the vitrified bond diamond composites achieved the peaks of 117.5 MPa and 113.6 MPa, respectively, which increased by 20.2% and 16.5% compared with that of sample without the addition of BaO.

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“…He conducted that TiO 2 and LiF facilitate the crystallization process and favour the transformation of β-eucryptite solid solution (β-eucryptite ss) to β-spodumene solid solution (β-spodumene ss), and hexacelsian to monoclinic celsian (m-celsian). Khater and Idris [8,9] studied the expansion characteristics of some Li 2 O-BaO-Al 2 O 3 -SiO 2 glasses and glass-ceramics. They conducted tests to obtain glass-ceramic materials characterized by low thermal expansion coefficient.…”

Section: Introductionmentioning

confidence: 99%

Preparation and properties of Li2O-BaO-Al2O3-SiO2 glass-ceramic materials

Khater

Idris

2014

PAC

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The crystallization of some glasses, based on celsian-spodumene glass-ceramics, was investigated by different techniques including differential thermal analysis, optical microscope, X-ray diffraction, indentation, microhardness, bending strengths, water absorption and density measurement. The batches were melted and then cast into glasses, which were subjected to heat treatment to induce controlled crystallization. The resulting crystalline materials were mainly composed of ?-eucryptite solid solution, ?-spodumene solid solution, hexacelsian and monoclinic celsian, exhibiting fine grains and uniform texture. It has been found that an increasing content of celsian phase in the glasses results in increased bulk crystallization. The obtained glass-ceramic materials are characterized by high values of hardness ranging between 953 and 1013 kg/mm2, zero water absorption and bending strengths values ranging between 88 and 126MPa, which makes them suitable for many applications under aggressive mechanical conditions.

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Expansion characteristics of some Li2OBaOAl2O3SiO2 glasses and glass-ceramics

Cited by 7 publications

References 4 publications

Effect of sintering temperatures on properties of BaO–B2O3–SiO2–Al2O3 glass/silica composites for CBGA package

Effect of sintering temperatures on properties of BaO–B2O3–SiO2–Al2O3 glass/silica composites for CBGA package

Exploring the Influences of BaO Amount on the Wettability and Mechanical Behavior of Vitrified Bond Diamond Composites

Preparation and properties of Li2O-BaO-Al2O3-SiO2 glass-ceramic materials

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