Growth mechanism of house-of-cards aggregates of alumina platelets containing Na2O–B2O3–SiO2 glass flux

Muto, Daimu; Hashimoto, Shinobu; Daiko, Yusuke; Honda, Sawao; Iwamoto, Yuji

doi:10.1016/j.ceramint.2019.12.160

Cited by 4 publications

(1 citation statement)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As can be seen from Figure 3, before sodium carbonate is added, the glass transition temperature, T g , is 484 • C and the glass softening temperature, T f , is 574 • C. The starting point of the exothermic peak shows that the crystallization temperature, T S , is 584 • C, and at this temperature, the crystallization and nucleation of the glass occur simultaneously. For the glass with added sodium carbonate, T g was 469 • C, T f was 499 • C, and T s was 534 • C. Compared with the glass without sodium carbonate, these three characteristic temperatures are all reduced, indicating that the addition of sodium carbonate can enhance glass sintering [16][17][18][19]. It can also be seen from Figures 3 and 4 that the sample of glass with sodium carbonate added has lost weight after sintering, and a new phase of Bi 24 Si 2 O 40 is generated, which is called sillente, a member of class of stable Bi 2 O 3 derivatives in which Si can stabilize γ-Bi 2 O 3 to a Bi 24 Si 2 O 40 phase at lower temperatures [20].…”

Section: Tg-dsc Analysis Of Samplesmentioning

confidence: 99%

The Effect of Adding Sodium Carbonate on the Electrical Conductivity of Aluminum Paste

2021

View full text Add to dashboard Cite

Base metal pastes have been widely used in the preparation of ZnO varistor electrodes, and it is important to accurately grasp the relevant mechanisms affecting the conductivity of aluminum electrodes. In this paper, the effect of adding sodium carbonate on the conductive property of aluminum paste was assessed, and the microscopic mechanism during aluminum electrode sintering explored. The results show that adding sodium carbonate can reduce the softening point of glass powder and enhance its fluidity. Sodium carbonate, glass, and aluminum oxide film react together; consequently, the aluminum oxide film is partially dissolved by reaction to produce defects, and there is tight contact at the interface between the aluminum powder particles. The sodium ions will displace the aluminum ions in the alumina, conferring the alumina film with a certain ionic conductivity. At the same time, sodium ions are doped into the aluminum lattice, which causes the aluminum lattice to swell. After sintering, the structure of aluminum electrode is compact and its electrical conductivity is significantly improved. This study is a valuable reference for the theoretical research and the potential applications of aluminum paste.

show abstract

Section: Tg-dsc Analysis Of Samplesmentioning

confidence: 99%