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Home  >  Journal list  >  Journal of the Society of Materials Science, Japan  >  Vol.55  No.7 (2006)  >  pp.670-674

Journal of the Society of Materials Science, Japan
<<Previous article Vol.55  No.7 (2006)   pp.670 - 674 Next article>>

Hardening Mechanism of Refractory Patching Materials with Phosphate Binder

Shinichi SAKIDA1), Yuichi YAMAMOTO2), Tokuro NANBA2), Yoshinari MIURA2), Tetsuhiro HAYASHI3) and Akira YAMAGUCHI4)
1) Health and Environment Center, Okayama Univ.
2) Dept. of Environmental Chemistry and Materials, Faculty of Environmental Sci. and Tech., Okayama Univ.
3) Hayashi Rozai Co., Ltd.
4) Okayama Ceramics Res. Foundation


The hardening mechanism of refractory patching materials with a phosphate binder was investigated by means of 31P static and magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy. Ten refractory patching materials were made of refractory powders of SiO2 and fused alumina and five mixed solutions of phosphoric acid and aluminum biphosphate as phosphate binders. 31P static and MAS NMR spectra were measured of five phosphate binders and twenty soft and hard refractory patching materials, respectively, to reveal the local structure around P atoms. The 31P static and MAS NMR spectra revealed that PO4 tetrahedra in the phosphate binders have no P-O-P linkage between PO4 tetrahedra and that as the patching materials become hard, the ratio of PO4 tetrahedra with bridging oxygens increases, respectively. This result suggests that the hardening of the patching materials is caused by the condensation of the phosphate binder. But the ratio of PO4 tetrahedra with bridging oxygens was not enough to form the network by P-O-P linkage between PO4 tetrahedra. On the basis of these results, the hardening mechanism of refractory patching materials with a phosphate binder is proposed.


Keyword:
Refractory patching material, Phosphate binder, SiO2, Fused alumina, 31P MAS NMR spectroscopy, Local structure, Hardening mechanism

Received: October 05, 2005
Published online: July 24, 2006
Copyright (c) 2006 by The Society of Materials Science, Japan

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