Thermal expansion coefficient and dielectric properties of non-stoichiometric cordierite compositions with excess MgO mole ratio synthesized from mainly kaolin and talc by the glass crystallization method

Banjuraizah, Johar; Mohamad, Hasmaliza; Ahmad, Zainal Arifin

doi:10.1016/j.jallcom.2010.01.002

Cited by 30 publications

(12 citation statements)

References 39 publications

(53 reference statements)

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“…The dielectric losses of the glass-ceramics in this article are higher than that of glass-ceramics prepared from high-purity raw materials [1]. However, the dielectric losses of some glass-ceramics are lower than the reported glass-ceramics from other natural raw materials [36]. The dielectric loss comes from two aspects: intrinsic and extrinsic.…”

Section: Resultsmentioning

confidence: 61%

Crystallization mechanisms and properties of α-cordierite glass–ceramics from K2O–MgO–Al2O3–SiO2 glasses

Song¹,

Wu²,

Li³

et al. 2015

Journal of Non-Crystalline Solids

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Section: Resultsmentioning

confidence: 61%

Crystallization mechanisms and properties of α-cordierite glass–ceramics from K2O–MgO–Al2O3–SiO2 glasses

Song¹,

Wu²,

Li³

et al. 2015

Journal of Non-Crystalline Solids

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“…Although samples A6 and A7 have lower crystallization temperature compared with A3, A4, and A5, but the forsterite phase was crystallized during sintering at 900°C for 2 h in these compositions, and consequently increased the dielectric constant value. It has been reported in a previous paper 28 that the dielectric constant of these samples was 5.97 and 6.14, which was higher than the standard range of dielectric constant reported for dense and high‐purity α‐cordierite 5,6 . This caused the densification process to end at lower temperature, thus crystallization before densification has resulted in higher porosity and higher dielectric constant 28 …”

Section: Resultsmentioning

confidence: 65%

Densification and Crystallization of Nonstoichiometric Cordierite Glass with Excess MgO Synthesized from Kaolin and Talc

Banjuraizah

Mohamad

Ahmad

2010

Journal of the American Ceramic Society

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Densification and crystallization behaviors of nonstoichiometric cordierite synthesized from minerals through the glass route are reported in this paper. DTA of glass powder was conducted under isothermal and nonisothermal conditions. The activation energy was calculated from the dilatometry test at constant heating rate by using Arrhenius equation to observe their densification behavior. The densification and crystallization of composition with MgO mole ratio of 3.4 and 4.0 below 9001C were confirmed using nonisothermal DTA and dilatometry. However, samples below 2.6 mol MgO were not fully densified and crystallized when isothermally heated for 2 h. When MgO content was increased 2.0-3.0 mole ratio, the activation energy for densification decreased, but it increased for MgO mole ratio ! 3.4.

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“…These results were attributed to the increase in the amount of latex in ELH mixing sequences. Banjuraizah et al, 2010, stated that a material with a low dielectric constant has a great advantage to be used in high speed integrated circuit substrate since a low dielectric constant will increase signal transmission speeds by decreasing the propagation delay [20].…”

Section: Flexural Propertiesmentioning

confidence: 99%

Porous Epoxy: Effect of Mixing Sequences (ELH versus EHL) Using Toluene as Extraction Medium via Ultrasonic Technique

Ishak

Teh

Ngoc

et al. 2016

International Journal of Polymer Science

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Porous epoxy was fabricated using natural rubber latex (NRL) as the void template. In this study, two mixing sequences were selected: epoxy, hardener, and then latex (EHL) and epoxy, latex, and then hardener (ELH). The extraction process was carried out to extract the latex particles from the cured epoxy sample using toluene as extraction medium with ultrasonic technique for 1 hour. The formation of porous structure in epoxy system is dependent essentially on the amount of latex removed from the epoxy matrix. As expected, the density results showed lower values in the porous epoxy in ELH mixing sequences. More porous structure in epoxy was obtained which was proven by the increasing in porosity % which has led to lowering of the value in dielectric constant which is preferred for electronic packaging application. However, it also caused a decrease in flexural strength and modulus.

show abstract

Thermal expansion coefficient and dielectric properties of non-stoichiometric cordierite compositions with excess MgO mole ratio synthesized from mainly kaolin and talc by the glass crystallization method

Cited by 30 publications

References 39 publications

Crystallization mechanisms and properties of α-cordierite glass–ceramics from K2O–MgO–Al2O3–SiO2 glasses

Crystallization mechanisms and properties of α-cordierite glass–ceramics from K2O–MgO–Al2O3–SiO2 glasses

Densification and Crystallization of Nonstoichiometric Cordierite Glass with Excess MgO Synthesized from Kaolin and Talc

Porous Epoxy: Effect of Mixing Sequences (ELH versus EHL) Using Toluene as Extraction Medium via Ultrasonic Technique

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