Effect of (BaO+CaO)/Al2O3 ratio (1.7∼2.0) on the structure and Al-Li association of BaO-CaO-Al2O3-CaF2-Li2O mold flux

Yang, Chen; Yang, Shuyao; Wang, Qiangqiang; He, Shengping

doi:10.1016/j.jnoncrysol.2022.121522

Cited by 6 publications

(2 citation statements)

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“…The potassium oxide content significantly impacts the electrical-insulating properties of both glass and tantalum, with alkali metal oxides tending to degrade the electricalinsulating properties of glass. However, low-alkali borosilicate glass demonstrates superior electrical-insulating properties compared to glass with a high alkali oxide content [18]. An experimental plan was devised to identify borosilicate glass with optimal insulating properties, which involved varying the K 2 O content within the 2-4.5 wt % range, with the total alkali metal oxide content (K 2 O + Na 2 O) maintained at 8-9.5 wt %.…”

Section: Materials Preparationmentioning

confidence: 99%

“…The number and positions of the characteristic vibrational peaks in the Raman spectra of the samples did not change as the B 2 O 3 content increased. According to the relevant literature, the peaks at 398 and 503 cm −1 correspond to the bending vibrations of glass bridging oxygens (Na 2 O-B 2 O 3 -SiO 2 ) and low-expansion glass contains a large amount of SiO 2 [18]; hence, the former peak is ascribable to Si-O-Si bending vibrations. The intensities of the bending vibration peaks are very similar between samples, with the peak at 398 cm −1 being more intense in each case, consistent with the abundance of Si-O-Si in the structure of each glass.…”

Section: Analysis Of Acid Resistance Performancementioning

confidence: 99%

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Effect of B2O3 and Basic Oxides on Network Structure and Chemical Stability of Borosilicate Glass

Lian,

Wang,

Wei

2024

Ceramics

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Glass properties play crucial roles in ensuring the safety and reliability of electronic packaging. However, challenges, such as thermal expansion and resistance to acid corrosion, pose long-term service difficulties. This study investigated the impact of the microstructure on acid resistance by adjusting the glass composition. A glass material with excellent acid resistance was obtained by achieving a similar coefficient of thermal expansion to tantalum; it exhibited a weight loss rate of less than 0.03% when submerged in 38% sulfuric acid at 85 °C for 200 h. Theoretically, this glass can be used to seal wet Ta electrolytic capacitors. Differential scanning calorimetry (DSC) was used to analyze the glass transition temperature and thermal stability of borosilicate glasses. X-ray diffractometry (XRD), scanning electron microscopy (SEM), and Raman spectroscopy were used to study the microstructure of the amorphous phase of the borosilicate glass, which revealed a close relationship between the degree of network phase separation in the borosilicate glass and the degree of polymerization (isomorphic polyhedron value, IP) of the glass matrix. The IP value decreased from 3.82 to 1.98 with an increasing degree of phase separation. Boron transitions from [BO4] to [BO3] within the glass network structure with increasing boron oxide content, which diminishes the availability of free oxygen provided by alkaline oxide, resulting in a lower acid resistance. Notably, the glass exhibited optimal acid resistance at boron trioxide and mixed alkaline oxide contents of 15% and 6%, respectively. Raman experiments revealed how the distributions of various bridging oxygen atoms (Qn) affect the structural phase separation of the glass network. Additionally, Raman spectroscopy revealed the depolymerization of Q4 into Q3, thereby promoting high-temperature phase separation and highlighting the unique advantages of Raman spectroscopy for phase recognition.

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Section: Materials Preparationmentioning

confidence: 99%

Section: Analysis Of Acid Resistance Performancementioning

confidence: 99%