Structure and viscosity of CaO–Al₂O₃–B₂O₃ based mould fluxes with varying CaO–Al₂O₃ mass ratios
Li, Jiangling; Chou, Kuochih; Shu, Qifeng (2020-01-15)
Jiangling Li, Kuochih Chou & Qifeng Chen, Structure and viscosity of CaO–Al₂O₃–B₂O₃ based mould fluxes with varying CaO–Al₂O₃ mass ratios, ISIJ International, 2020, Volume 60, Issue 1, Pages 51-57, https://doi.org/10.2355/isijinternational.ISIJINT-2019-234
© 2020 ISIJ. Published in this repository with the kind permission of the publisher.
https://rightsstatements.org/vocab/InC/1.0/
https://urn.fi/URN:NBN:fi-fe2020041415349
Tiivistelmä
Abstract
The effect of CaO/Al₂O₃ ratio on the structure of CaO–Al₂O₃–B₂O₃ based glassy mould fluxes was investigated by employing ²⁷Al and ¹¹B Triple Quantum Magic-angle spinning nuclear magnetic resonance (3QMAS-NMR) and Raman spectroscopy. ²⁷Al and ¹¹B 3QMAS-NMR spectrums showed that Al3+ mainly forms [AlO₄] as a network former and B3+ mainly forms [BO₃] groups in CaO–Al₂O₃–B₂O₃ based glasses. Raman spectrum showed existences of different [AlO₄] structure units and BO₃ pyro-borate units. In addition, deconvolution results on Raman spectrums indicate that the degree of polymerization of aluminate network in CaO–Al₂O₃–B₂O₃ based glasses decreases with the increase of CaO–Al₂O₃–B₂O₃ ratio. The effect of CaO–Al₂O₃–B₂O₃ ratio on viscosity of CaO–Al₂O₃–B₂O₃ based glassy mould fluxes was investigated by employing the rotating-cylinder method. The viscosity decreases with increasing CaO–Al₂O₃–B₂O₃ ratio in CaO–Al₂O₃–B₂O₃ based mould flux. Correlation between viscosity and structural information of investigated mould fluxes was explored.
Kokoelmat
- Avoin saatavuus [31657]