Bragina I. Improvement of hot pressing processes of powder materials on the base of op-timization of electric heating and tool design.

The object of the research is the hot pressing process of powder materials products with direct electric heating. The aim of the work is an increase the quality of refractory and ceramic powder products on the basis of hot pressing process improvement. The methods of research and apparatus are the theoretical analysis by finite element method, experimental investigations in an installation for hot pressing with electric current heating. Theoretical and practical results are the following: the methodology of FEM modeling of powder materials hot pressing with direct electric heating was developed taking into account the change in porosity and geometry of products-storage system accessories. The main regularities of temperature distribution in powder preforms and snap the hot pressing with direct electric heating, depending on the conductivity of the material, the design of tooling and process parameters pressing are established. Novelty is the influence of the main factors on the quality and characteristics of powder articles from ceramics and high-melting materials. Efficiency of implementation is the performed investigation offers possibility for production of the new bulk articles from nanocrystalline materials at holding of the starting structure and the unique properties. Area of application is metal forming, production of technical ceramics, powder metallurgy, research and development in the field of natural and engineering sciences.