期刊
REVIEWS ON ADVANCED MATERIALS SCIENCE
卷 58, 期 1, 页码 32-37出版社
WALTER DE GRUYTER GMBH
DOI: 10.1515/rams-2019-0008
关键词
chemical bond change; demoulding strength; colloidal silica-bonded castables; magnesia
资金
- National Natural Science Foundation of China [51572244, U1504526, U1604252]
The change in demoulding strength of colloidal silica-bonded castables with and without magnesia is investigated with emphasis on the relationship between the demoulding strength and chemical bond changes. It was confirmed that the demoulding strength was raised with the presence of magnesia in colloidal silica-bonded castables because of the increased chemical bonding between the sol particles. The X-ray photoelectron spectroscopy (XPS) and the Fourier transformation infrared spectroscopy (FTIR) results indicate the formation of new Si-O-Mg chemical bond from the decreased O 1s and Si 2p binding energy, and the appearance of weak vibration peaks at 668 and 419 cm(-1) in the spectrum of colloidal silica with the addition of MgO after curing at 30 degrees C for 24 hours. The reaction between colloidal silica and magnesia could promote the formation of -Si-O-Mg-O-Si- bonds, which is the primary reason for the demoulding strength improvement.
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