aluminium orthophosphate
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Ceramics ◽  
2020 ◽  
Vol 3 (1) ◽  
pp. 1-11 ◽  
Author(s):  
Vanessa Hopp ◽  
Ali Masoudi Alavi ◽  
Almuth Sax ◽  
Peter Quirmbach

Liquid alkali silicates (waterglasses) are used as chemical binders for a wide range of refractory applications, the setting of which can be initiated by the addition of phosphate hardeners. The duration of the setting process is of special interest for an economic lining with short aggregate downtimes. Therefore, in the present work, the influences of two different types of phosphate (aluminium orthophosphate and boron orthophosphate) on the hardening mechanisms of waterglasses are investigated. Time-dependent measurements by dynamic mechanical analysis (DMA) are carried out to observe the setting process. Structural information of the hardened amorphous samples is obtained by means of nuclear magnetic resonance (NMR) spectroscopy. It is shown that the use of different phosphates leads to differences in the setting rate, caused by different modes of network formation. The resultant silicate networks incorporate the aluminium or boron species but differ in the connectivity of those units. In addition, the distribution following the well-known Qn notation of the silicate units is directly influenced by the phosphate type.


2010 ◽  
Vol 92 (8) ◽  
pp. 715-720 ◽  
Author(s):  
S. Esteban ◽  
J. M. Marinas ◽  
M. P. Martinez-Alcazar ◽  
M. Martinez ◽  
A. R. Agarrabeitia

2005 ◽  
Vol 16 (10) ◽  
pp. 2129-2133 ◽  
Author(s):  
Minhua Cao ◽  
Xiaoyan He ◽  
Xinglong Wu ◽  
Changwen Hu

1999 ◽  
Vol 48 (6) ◽  
pp. 571-574
Author(s):  
Kiyoko SAKAMOTO ◽  
Shunro YAMAGUCHI ◽  
Atsushi NAKAHIRA

1987 ◽  
Vol 6 (2) ◽  
pp. 178-180 ◽  
Author(s):  
Akira Ono ◽  
Michiko Kobayashi

1986 ◽  
Vol 5 (7) ◽  
pp. 690-692 ◽  
Author(s):  
K. Byrappa ◽  
S. Srikantaswamy ◽  
J. Shashidhara Prasad

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