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Korean Journal of Metals and Materials > Volume 56(1); 2018 > Article
Korean Journal of Metals and Materials 2018;56(1): 72-78. doi: https://doi.org/10.3365/KJMM.2018.56.1.72
규산나트륨 수용액의 분자결합구조 및 열적특성 연구
류영복, 이만식
한국생산기술연구원 친환경재료공정그룹
Infrared Spectra and Thermal Properties of Sodium Silicate Solutions
Young Bok Ryu, Man Sig Lee
Green Mateials & Process Group, Korea Institute of Industrial Technology(KITECH), Ulsan 44413, Republic of Korea
Correspondence  Man Sig Lee ,Tel: +82-52-980-6630, Email: lms5440@kitech.re.kr
Received: 31 August 2017;  Accepted: 31 October 2017.  Published online: 1 January 2018.
ABSTRACT
An inorganic binder is a good way to mitigate the environmental issues of organic binders containing phenol, formaldehyde, etc. One of the most representative materials in the field of inorganic moulding sand binders is a group of binder systems based on alkali silicate compounds, however, many aspects need to be improved, such as flowability, usable time and moisture resistance. In order to develop and improve inorganic binders, it is necessary to understand the characteristics of raw materials and utilize them appropriately. In this study, FT-IR analysis and thermal properties of aqueous sodium silicate solution were investigated. The FT-IR analysis results indicated, that asymmetric vibrations had higher wavenumber than their symmetric vibrations and also the stretching vibrations appeared at higher energies than the deformation vibrations. FT-IR analysis of Na2SiO3 showed that the asymmetric stretching vibration absorption band of Si-O(Na) was indicated at around 1030 cm-1, and the absorption bands due to hydrated unit molecules were observed in the sodium silicate solution. As a result of TGA analysis of the dried sample, the weight loss of about 16% which was confirmed to be due to pyrolysis of the silanol group up to 500 oC, and an XRD analysis of the dried sample after heat treatment was confirmed that quartz crystals were formed at 900 oC or higher.
Keywords: sodium silicate solutions, FT-IR, thermal properties
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