Prof. Alexander Shmatov
Wuhan Textile University, China / Belarusian Institute of Construction Industry, Belarus
Title: PRACTICAL REALIZATION OF THE EFFECT OF HYDROCHEMICAL DISPERSION OF CERAMIC-FORMING MATERIALS
Abstract:
In the present work, based on known theories, scientific principles are formulated for the hydrochemical dispersion of inorganic and non-metallic powder materials. The effect of hydrochemical nanodispersion of ceramic-forming microparticles is established under conditions of wedging destructive action of surfactants and "pseudocavitation" thermohydrodynamic action of a boiling suspension during rapidly repeated changes in thermal, chemical, and physical gradients created in the coarse dispersion system. A geometric model of this process is developed, and a generalized equation is proposed to describe the influence of various technological parameters on the degree of hydrochemical dispersion of inorganic ceramic-forming particles.
Based on a study of the effect of hydrochemical treatment on changes in the size and volume fraction of dispersed quartz and chalk particles in an aqueous dispersion medium, it was established that: (1) two opposing processes compete during hydrochemical treatment — nanodispersion and aggregation of nanoparticles; (2) during prolonged hydrochemical treatment, the resulting aggregates in the aqueous dispersion medium are broken down into nano-objects, increasing the proportion of nanoparticles in the dispersion system. As a result of hydrochemical dispersion of micropowders of refractory compounds and other inorganic materials, the suspension is converted into a hydrosol of ceramic materials. Boiling of articles in such a hydrosol followed by heat treatment is called thermohydrochemical treatment (THCT) and is an effective method for surface strengthening of tools.
Features and examples of practical application of THCT technology for strengthening cutting and stamping metalworking tools made from different materials are presented. After performing THCT of tools using a multicomponent oxide hydrosol, the wear resistance of steel tools increased by 1.4–8 times, hard alloy tools by 1.3–3.6 times, and diamond tools by 1.6–3.3 times compared to conventionally treated ones.
Biography:
Since 2021, Shmatov А.А. have received the degree of D.Sc. in Materials Science and Mechanical Engineering, as well as the title of Academician and Professor of the Russian Academy of Natural Sciences. Now Shmatov А.А. works at two universities: as a professor at Wuhan Textile University and as a chief researcher at the Belarusian Institute of Construction Industry.
Research Interest: The main directions of scientific activity of Prof. Shmatov A.A. is the development of scientific foundations and principles of strengthening materials, and on their basis the creation of efficient, economical and ecologically clean methods for strengthening machine parts and tools made from steels, hard alloys and diamond materials in the areas of heat treatment, thermo-chemical treatment and nanotechnology. Prof. Shmatov A.A. is interested in physical, mathematical and graphical modeling of strengthening materials processes, as well as optimization of technological processes for strengthening products and tools.