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Peculiarities of CaO·6Al2O3 formation using low temperature combustion synthesis

Robert Ianoş 1Ioan Lazău 1Cornelia Păcurariu 1Paul C. Barvinschi 2

1. Politehnica University of Timişoara, P-ţa Victoriei no. 2, Timisoara 300006, Romania
2. West University of Timisoara (UVT), Bd.V. Parvan nr.4, Timisoara 300223, Romania


The paper presents for the first time a new version of the solution combustion synthesis with applications in the CaO·6Al2O3 direct formation, without any additional thermal treatments. The starting point was the premise - confirmed in our previous results - that there is a predilection of metal nitrates with respect to certain fuels.

The used raw materials were: Ca(NO3)2·4H2O, Al(NO3)3·9H2O, urea, glycine and β-alanine. The experimental determinations evidenced that glycine or β-alanine lead to the formation of an amorphous reaction product, whereas urea leads to the formation of a phase mixture consisting of CaO·6Al2O3 and α-Al2O3.

On the other hand, the use of a stoechiometric fuel mixture containing urea and β-alanine alongside the desired metal nitrates ensures the straight formation of a pure, well-crystallized CaO·6Al2O3, without any subsequent calcination step. The experimental results prove that the version we suggested - the use of a fuel mixture - is definitely better than the traditional version of the combustion synthesis, based on using a single fuel.


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Presentation: Poster at E-MRS Fall Meeting 2007, Symposium A, by Robert Ianoş
See On-line Journal of E-MRS Fall Meeting 2007

Submitted: 2007-02-20 09:42
Revised:   2009-06-07 00:44