High temperature rheological study of borosilicate glasses containing platinum group metal particles by means of a mixer-type rheometer

作者：Puig Jean; Hanotin Caroline; Neyret Muriel^*; Marchal Philippe

来源：Journal of Nuclear Materials, 2016, 469: 112-119.

DOI：10.1016/j.jnucmat.2015.11.053

• Vitrification
• Borosilicate glass
• Platinum group metals
• Critical stress
• Cross model

In this paper, the rheological behavior of six simulated high level waste nuclear glasses containing 0 to 5.2 wt% platinum group metals (PGM) has been studied at a temperature of 1200 degrees C. By means of a stress imposed rheometer, the shear stress dependence of the viscosity, which was so far assessed only at high shear rates, has been investigated on a wider range. Experimental data have been well fitted by the Cross model and a critical stress corresponding to the rupture of PGM aggregates has been evidenced. At high shear rates, the dependence with the volume fraction in PGM particles is well accounted for by Quemada's law. At low shear rates, the first Newtonian plateau is shown to be strongly dependent on the PGM content, notably above 3 wt% and to follow an exponential dependence due to the existence of more complex structures at the origin of the critical stress.

• 出版日期2016-2
• 单位中国地震局