A parameter for the evaluation of sintering of ceramic materials

A method for analyzing the sintering process in ceramic materials in an isothermal regime using a multifactor evaluation parametern, which can be one of the main control parameters of the sintered system, is suggested. The results of experimental investigations of sintering processes in clays and mixtures used in the production of various ceramic pieces are presented. The method is simple and can be used in laboratory and industrial conditions.     

Possible Phenomena of Stochastic Behaviour of Shear Deformed Aluminum

The influence of shear deformation on the behaviour of Mg and Zn impurities as well asself-interstitial atoms in Al was studied using molecular dynamics method.The profilies of potentialrelief were calculated in directions of possible migration of interstitials.It was found that under load-ing the location of interstitial atoms may be undefined.It means that the system of determined parti-cles may go into stochastic regime of behaviour.     

Study of the behavior of the graphite-sodium system for the central rotating column in a BN-600 reactor

The characteristics of sodium permeation through graphite and the accompanying swelling of the graphite are examined for the central rotating column of a BN-600 reactor. The sodium transport parameters when sodium comes into contact with graphite at 350–500°C for up to 400 h are determined experimentally. Under these conditions, the permeation parameter is (0.13–1.3)·10⁻¹¹ m²/sec, which corresponds to an effective diffusion coefficient (0.2–2)·10⁻¹¹ m²/sec. The ratio of the increment to the graphite volume and the sodium mass there is ∼0.85. __________ Translated from Atomnaya énergiya, Vol. 101, No. 6, pp. 431–437, December, 2006.