Destruction processes in coagulation structures in vibration of coarse thixotropic corundum — Mullite — Alumina and corundum — Zircon — Alumina mixtures

Results obtained in studying the destruction processes in coagulation structures in vibration of castable thixotropic corundum — mullite — alumina and corundum — zircon — alumina mixtures containing fine alumina are presented as a function of various manufacturing parameters. General regularities and destruction mechanisms in these mixtures are established. The results are used to devise manufacturing techniques for vibrocast corundum and mullite — corundum — zircon refractories. Translated from Ogneupory, No. 8, pp. 12 – 17, August, 1994.     

New Refractories Developed by the Ukrainian Research Institute of Refractories Named after A.S. Berezhnoy

The article gives an introduction to the Ukrainian Research Institute of Refractories and especially its R D and refractory products for the industries of iron and steel,nonferrous,glass and chemistry etc.     

Effect of preparation conditions on nanostructural features of the NAFION® type perfluorinated proton conducting membranes

Features of the fine structure of three samples of perfluorinated Nafion® type membranes—Nafion-115, its Russian analogue MF-4SK, and a new similar material PFM-E produced according to our novel water-emulsion technique—have been characterized using the small-angle neutron scattering technique. A difference in the regularity of common elements of fine structure (cylindrical channels) in the membranes has been revealed. Nafion-115 has the most regular structure with a diffraction peak corresponding to the double channel diameter and an additional broad maximum in the scattering curve indicating a long-range order in the arrangement of straight cylindrical channels. For MF-4SK, in addition, twisted and less ordered channels have been observed. In the PFM-E sample channels have a tortuous and branched structure with diameters similar to Nafion-115. Only a short-range order (40–50 Å) in the arrangement of the channels has been detected, and correlation in their mutual orientation at longer distances is weakened. It has been supposed that the observed branched structure of the channels promotes an increase in water content and an improvement in proton conductivity.     

The effect of a Au impurity on the photoluminescence of porous Si and photovoltage on porous-Si structures

Semiconductors - The effect of doping with gold on the photoluminescence properties and electronic states of structures consisting of porous Si and single-crystal Si, formed by chemical stain...     

Chamotte from Murzinsk deposit kaolin

Conclusions Production of chamotte from Murzinsk kaolin was assimilated and introduced at the Vatutinsk combine. Its properties correspond to TU 14-8-58-72. Chamotte was used to produce high-grade refractories.Translated from Ogneupory, No. 7, pp. 25–26, July, 1986.