Abstract
The results of experiments on application of NaH2PO4 as a binding agent for ceramic kaolin samples were presented. The experiments were carried out at temperatures of 973, 1073 and 1173 K and NiO and CoO additives were used as tempering agents. The parameters of the obtained samples with NaH2PO4 were compared with the samples compressed with water only. The materials of 3-4 times higher bending strength, lower water absorption as well decreased open porosity were prepared during these experiments. The binding function of the NaH2PO4 additive relies on creation of some compounds in reaction between the products of its condensation and products of kaolin decomposition. Finally a ceramic material of prospective properties was created.
Similar content being viewed by others
References
J. Pawłowski and S. Serkowski, Ceramika z. 28, s. 11, PAN Publication, Wrocław 1978.
J. Pawłowski, S. Serkowski and M. Spicka-Lizer, ibid. s. 127.
S. Pawłowski, Physicochemical bases of using phosphate binders, ibid. s. 7.
S. Wafke, K. Pniewska, A. Gierek, S. Pawłowski and S. Nowak, Patent PRL Nr 166020 (1976).
Z. Jańczuk, Outlines of Stomatology, Warsaw 1979.
W. D. Kingery, J. Am. Ceram. Soc., 8 (1996) 33.
W. D. Kingery, ibid. 3 (1998) 35.
R. Wyrwicki, Thermogravimetric analysis of silty rocks, Warsaw University Publication, Warsaw 1988.
M. Földvári, J. Therm. Anal. Cal., 56 (1999) 909.
J. Kristóf, R. L. Frost, J. T. Kloprogge, E. Horváth and É. Makó, J. Therm. Anal. Cal., 69 (2002) 77.
L. Heller-Kallai and I. Lapides, J. Therm. Anal. Cal., 71 (2003) 689.
A. K. Chakraborty, J. Therm. Anal. Cal., 71 (2003) 799.
A. K. Chakraborty, Thermochim. Acta, 398 (2003) 203.
W. A Doilase, L. H. Merwin and A. Sebald, J. Solid State Chem., 83 (1989) 140.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Szafran, M., Gontarz, Z. & Wiśniewski, P. Chemical processes in kaolin sintered with NaH2PO4 . Journal of Thermal Analysis and Calorimetry 74, 667–672 (2003). https://doi.org/10.1023/B:JTAN.0000005209.55073.14
Issue Date:
DOI: https://doi.org/10.1023/B:JTAN.0000005209.55073.14