Cheremsky Р. Роres іn соndensates аnd соmposites systems

Object - рores formation processes and pore evolution in condensates and compositional systems. Aim: cognition of pore genesis and evolution in condensates and compositional systems. Methods: X-ray small-angle scattering, sorption methods, precision measurements of density, optical and electron microscopy, X-ray diffractometry, mercurial porosimetry. Results, novelty: The thesis is devoted to investigation of genesis and evolution of pores in condensates and typical composite systems under external influence as well as to grounding the concept of pores as phase and structure nonuniformities in solids based on thermodynamical principles of phase equilibrium and diagram representation of pore systems. The regularities and mechanisms of pore generation in amorphous and crystalline condensates and composite systems as well as the conditions for occuring the fractal features in them were established dehending on structure formation conditions that is necessary for setting the porosity characteristics in construction and functional materials. The evolution of porous structures under gas saturation, isothermal heating, long-time thermal cycles, irradiatiation and mechanical loading has been studied. The main factors affecting on pore generation in outer space were established along with dependencies on them for porosity of materials applied in aerocosmic and other fields of material technics in order to predict their efficiency under long-time exploitation in natural conditions. Field of implementation: physics of metals and physical material science.